Unfortunately, there are a few downsides to raising the crossover frequency. Suffice it to say, it takes a lot of speaker to get a lot of output with an 80Hz crossover, even in a smaller room. 25 Subwoofer has now defined a new benchmark that will be extremely difficult to beat. REL Set-Up Made Simple RELs are not traditional subwoofers, but true sub-bass systems. Second, the Studio III's sub-bass range eliminates the need for a high-pass filter to roll off the main speakers. (REL calls them “sub-bass systems,” which is technically accurate, but for now I’ll use the more common term “subwoofer.”) I have always had full-range main loudspeakers, from Infinity RS-1bs to Magnepan 20s, 20.1s, and now 20.7s. The T/5i is a quality product. First, REL believes that the subwoofer should get its signal from the exact source driving the main speakers, for best integration with the audio system. So set the crossover in your receiver or pre/pro to 80Hz and you’re all set, right? In fact, Steve’s day job is network administration and accounting. This is a subwoofer with excellent integration at the handover to the speakers, and the overall performance is never anything less than composed, and free of any harshness or lack of control. But, in my humble opinion, there are only a few contenders that can really deliver world class two channel performance and integration. Articles is our blog where we share insights, information and opinions on subwoofers, hi-fi systems and the joy of sound. This small cabinet with only a 10" woofer delivers the deepest, tightest bass we've ever heard from a sealed REL.Much of the credit for this … Plug in and play, zero-compression wireless system for Serie T/i that eliminates the need for costly and restrictive cables. Improvements in soundstage focus along with greater detail in the both the middle range and treble are already evident. The easy-to-use, zero-compression, wireless system designed for S/510 and S/812. So REL products are engineered for integration into stereo systems. Brian Benitez Friday, June 8, 2018. Above and beyond this, the distance adjustment functions as a phase control of sorts. The first sub they hooked up was a REL Q150E Mark II. Frequently Asked Connection Questions. Now consider this system is only certified for smaller rooms up to 2,000 cubic feet. We’re aware of at least one AES paper on the topic, #6431 “Detection of Subwoofer Depending on Crossover Frequency and Spatial Angle between Subwoofer and Main Speaker.” That paper has several useful conclusions to keep in mind. If you’re a regular reader of the site, you’ve probably seen us claim that subwoofers are one of the most important pieces in an A/V system. Set the LFE level on the REL to minimum to avoid interference and tape off the BLACK wire of the high level cable to insulate against accidental shorting. 1. The THX Select certified Atlantic Tech 4400 L/R speaker is a pretty heavy duty piece of equipment for a <2,000 cubic foot room. The company is into good subwoofers, the kind that are intended to make music, not go boom. The S/812 enriches high-end stereo and theater systems with deliciously sumptuous natural bass, high quality construction, and gorgeous finishes. Surprised that there are no replies to such an easy tweak, so anyhow here is my experience. With any given speaker, this also means that you potentially net an additional 6dB of displacement-limited output versus an 80Hz crossover frequency, as well as lower distortion at any given volume. REL is at the top of my very short list of these brands. We’ve broken the How to Connect Series into Three groups Considerations Before Connecting, Connecting […] Starting At: £4,799.00 While the combination of high and low pass filters utilized in bass management theoretically results in a smooth response, in practice the actual results can be anything but. REL Acoustics T/9i Subwoofer, 10 inch Front-Firing Driver, Arrow Wireless Port, High Gloss Black SVS SB-3000 Subwoofer - 13-inch Driver, 800W RMS, 2,500W Peak Power, DSP Control App - Premium Black Ash While getting a subwoofer that extends to 200+Hz isn’t a major challenge, the topic of subwoofer localization is a bit more complicated. For the tested listeners and samples used, 120Hz (with a 24dB/octave slope) was the maximum crossover they could use without anyone detecting the subwoofer. Simple and intelligently designed to eliminate the sound bumps and gaps that occur with competing subwoofers, these filters are exceptionally fast, ensuring excellent responsiveness from the subwoofer. p.s. Therefore, for the moment, set aside everything you’ve been The practical meaning of this is that a crossover at or below 120Hz is a relatively safe bet, but it can be worth experimenting with a higher crossover to see what works for you. Goofy Home Theater Set Up. Following in the footsteps of the Arrow™ and Longbow™, HT-Air™ delivers premium Home Theater sound removing long lengths of costly, cluttered cables. Added one REL T/5i to my hi-res stereo system. A Word On Ports: As mentioned, ported speakers will tend to throw off the math a little bit. A word of wisdom: don’t underestimate the power of the distance setting in your A/V receiver. In extension the REL was as good as its word, descending with authority into the low thirty-cycle range and perceptibly lower as it rolls off. If REL T5 or T7 is that bad, why are so many people who have them recommending them for 2 channel music application? Just saying REL sucks doesn't really help. To qualify that statement, one should consider that a great subwoofer is a lot like a great quarterback. Am I correct to presume this is the only method for high level connection? Join our Exclusive Audioholics E-Book Membership Program! After the dealer listened to my speakers they understood why I was having problems with subwoofer integration. These are small, powered subwoofers, benefitting from all the high-performance system integration and control you get from REL designs, but in a cube not much larger than a couple of shoeboxes. What I didn’t cover is how best to connect a subwoofer if you choose to … In modern A/V receivers and pre/pros, this is accomplished via the use of digital high pass and low pass filters. Free shipping on all orders. Steve Munz is a “different” addition to Audioholics’ stable of contributors in that he is neither an engineer like Gene, nor has he worked in the industry like Cliff. Low Level Input: The Low level input is rarely recommended over the High Level input, however this connection method still produces amazing low end and seamless integration. In addition, it is our experience that good placement as well as running a dual-subwoofer setup can also help reduce the effects of localization, particularly if those subs are adjacent to your main L/R speakers. Connecting High Level to Various Type of Amps and with Stereo Pairs of Rels. Improvements in soundstage focus along with greater detail in the both the middle range and treble are already evident. To implement subwoofer integration, set up the routing as shown in this screenshot. Enjoy the Music, Get the Audioholics AV Gear Guide Ebook FREE! The key is being able to measure those different responses with a tool like Dayton Omnimic, XTZ’s Room Analyzer, or REW. For optimal performance, you need a measurement system like XTZ’s Room Analyzer II. JohnF January 29, 2019, 1:37pm #1. My findings re integration and tonality would concur wholeheartedly. How to connect your REL via Low Level ; Step 4. All Rights Reserved. Obviously no bass management or distance settings will turn a junk speaker into a great one; however, when considered in the context of overall system design, they can help create a system that is something more than just the sum of its parts. Due to a Covid-19 exposure in our warehouse we are experiencing 5 day shipping delays. To Follow up on our How to Tune a REL powered subwoofer Series. Official online store. Please check out our recently added YouTube instructional video that gives you step by step on how to configure your bass management settings before reading this article. Even if the crossovers included in a subwoofer are great, actually using them is a different story with the cabling required. If you’re a regular reader of the site, you’ve probably seen us claim that subwoofers are one of the most important pieces in an A/V system. Nice article Steve, but I always thought of the sub as a linebacker rather then the QB! Not quite. The 2nd way is to bung your speaker in order to give it a natural 2nd order acoustic high pass filter which combines with a 2nd order high pass for your 4th order total high pass filter. REL’s T9i sits at the top of the Ti range and alike 99% of REL’s subwoofers is an infinite baffle design or closed non-ported box, making the unit very fast and expressive. The Maggies are incredibly fast speakers in the bass section and need a subwoofer to augment the low end rather than just play all of the bass notes, and it must be as fast. REL is a British company that’s dedicated to making subwoofers, but not just any subwoofers. The visuals should make it easier to understand the process of connecting a REL to your system. Our award-winning home theater subwoofers with wireless capabilities elevate any system. Frequency response for the SVS SB13-Ultra. Got small speakers and a desire for bigger, better output? Since the main purpose of my system is reproducing movie soundtracks i decided to focus on the Q-series. Developed by our engineers specifically for use with REL subwoofers to maximize the information available in the high-level connection. The Subwoofer's Own Crossovers . I have my LS50Ws hooked up to a REL T7/I with crossover at 70hz. It improves the overall listening experience. You clearly don't like the REL but do you have a constructive recommendation for another sub? So the preferred method of connecting a REL subwoofer is by using the high-level, unbalanced, dual-channel (stereo) signal feed via the Neutrik Speakon cable which is connected to your amplifier's left and right channel speaker terminals. I have now owned the new REL T5 subwoofer for about a month and wanted to write a mini review of this subwoofer. After some enthousiatic stories about REL subwoofers i decided form my own opinion. available only at authorized retailers. An example of such a subwoofer is the SVS SB13-Ultra, and you can peruse our full list of reviewed subwoofers to see how they all stack up in this respect. Measure and equalize the subwoofer . REL subwoofer connection. Not too shabby for a setting that takes a second or three to switch. Seriously, how important can this be? This is a very important point and together with the REL’s Active Bass Controller (ABC) ensures far superior system integration of the sub-bass with the main system. Proper break in of the new REL subwoofer is proceeding as instructed with fine tuning of the system just around the corner. REL Acoustics T/5i Subwoofer, 8 inch Down-Firing Driver, Arrow Wireless Port, High Gloss Black KEF LS50 Wireless Powered Music System (Black, Pair) ELAC Debut 2.0 SUB3010 400 Watt Powered Subwoofer… A port functions as a Hemholtz resonator, adding output over a relatively narrow bandwidth. REL receives exactly the same signal as the main speakers. In some ways I’m an unlikely choice to write a subwoofer review. The purchase and delivery was without issue. REL Acoustics T-7 subwoofer review. This a huge deal: the implication is that instead of needing a pair of 5.25” woofers as seen in the aforementioned 4400 L/C/R speakers, you could get by with a single woofer assuming its power handling was up to snuff. However, approximately half the listeners couldn’t detect the subwoofer at the maximum crossover frequency tested (227Hz). The visuals should make it easier to understand the process of connecting a REL to your system. Check out the Tuning Videos after you have completed Connecting. Check out the videos below. “Let our rigorous testing and reviews be your guidelines to A/V equipment – not marketing slogans”. About this item Experience home theater and music as the artist intended with the most award winning high-end subwoofer brand, REL Acoustics. REL So, put on your favorite album, mix yourself a drink and kick back, you might be here awhile. * These are recommended best practices for positioning a REL Subwoofer… A good home theater is a team effort from all components! Confused about what AV Gear to buy or how to set it up? Again, to make the most out of this tool, one does need the ability to take measurements. Things did not start off too well with my acquisition of this sub, my dealer was back-ordered over a month and apparently the supplier...Sumiko US, has problems with acquiring enough supply to meet demand. You let auto-calibration take care of this for you, or if you’re feeling particularly hands on, you might whip out the tape measure, right? At REL we make powered subwoofer speakers for stereo & home theater systems. If you are connecting to a theatre system, you are already making this connection between the SUB OUT of your processor to the LFE input of the REL. 99% of receivers/processors use a 2nd order high pass filter and most speakers these days are ported so they don't work correctly. Last but not least, any discussion of bass management has to include taking measurements. Hi-Fi Corner. This is a very important point and together with the REL’s Active Bass Controller (ABC) ensures far superior system integration of the sub-bass with the main system. If the port is tuned relatively low (<60Hz), the port contribution at 80Hz will be negligible, so the math still works pretty well. We’ve broken the How to Connect Series into Three groups Considerations Before Connecting, Connecting High Level to Various Type of Amps and with Stereo Pairs of Rels, and Connecting Low Level. REL defined the conditions for successful integration years ago by following three simple but hitherto elusive principles: High Level Connectivity To ensure no blurring or other sonic degradation to the main system, the solution is to connect the sub-bass system from the power amp. So you really have 2 choices, one is to get a processor or receiver capable of a 4th order high pass filter on the mains, I use an emotiva UMC 200 to achieve this but there are other ways. The REL R-218 is an Award-Winning, Music-Optimized, Compact Subwoofer - And It's Shockingly Great. If you want to skip a dedicated crossover, most subwoofers have built-in crossovers. With respect to the THX standard, 80Hz makes a lot of sense when you take into consideration their entire ecosystem of hardware. 4. October 12, 2017 by Paul McGowan. To live up to these lofty expectations, your subwoofer has to be properly integrated with the rest of your system. AV Receiver Bass Management Basics – Settings Made Simple, Bass Optimization for Home Theater with Multi-Sub + mDSP, History of Multi-Sub & Sound Field Management (SFM) for Small Room Acoustics, Subwoofer Integration: Bass Management and Distance Settings Explained. In addition to the subwoofer out, the LS50W app also does a couple of other things to make subwoofer integration simple and optimal. Copyright © 1998–2020 Audioholics, LLC. Failure to get these adjustments right can adversely impact the sound quality of your home theater and its ability to reproduce the rumbles in action sequences of blockbuster movies. Caveat Emptor Also compatible with G1 Mark II. Integration with my Thiel CS 2.4 Loudspeakers is very good in my humble opinion. To Follow up on our How to Tune a REL powered subwoofer Series. The best way to connect a sub Join Our Community Subscribe to Paul's Posts. Connecting via LFE/.1 (Theater only) When should I use the LFE/.1 input on my REL? Once configured correctly my Ayon’s became very well fleshed out and richer in tonality through their entire frequency range. How to Set Up an AV Receiver Bass Management, HDMI and More YouTube Instructional. Also purchased the Arrow wireless transmitter; it allowed location flexibility. As far as the subwoofer goes, we like to see a smooth response up to at least 200Hz to ensure a smooth blend between it and your speakers, even if users opt for a higher crossover setting. The most common configuration is the THX standard, which specifies a 12dB/octave high pass filter at 80Hz for your speakers, and a 24dB/octave low pass filter for the subwoofer. Proper break in of the new REL subwoofer is proceeding as instructed with fine tuning of the system just around the corner. At an MSRP of $7500 each, the current flagship REL No. How do I use LFE/.1 input? Sign up and stay connected for exclusive deals. So what happens if we bump up the crossover frequency? Which makes the REL T-Zero all the more vital. In the case of a relatively modest bump in the crossover point from 80Hz to 120Hz, you’re still cutting driver displacement by more than half. Glancing at Atlantic Technology’s website, one can find several THX certified systems, ranging from their beastly THX Ultra 2 certified System 8200e down to the petite THX Select certified System 4400. This is a very important point and together with REL’s Active Bass Controller (ABC), ensures far superior system integration of the sub-bass with the main system. Still, who would have ever thought such an innocuous setting could have that kind of power? In 2007, the NaturalSound crossover was introduced to ensure seamless integration of the main speakers with Rel Acoustics subwoofers. QB = center speaker; a central player that gets all the attention, but it is nothing without a good team. Integration with my Thiel CS 2.4 Loudspeakers is very good in my humble opinion. In addition, as the crossover frequency goes up, it becomes easier to locate the subwoofer by ear. Measurements for subwoofer integration are done with the microphone at the listening position and pointed between the two speakers. A REL is designed to augment the performance of “full range” speaker systems, to provide linear response down to below 12 Hz (Studio III, -6 dB down at 9 Hz). Not all subwoofers offer enough top end extension to allow for a 120Hz+ crossover. Have you already played the game of crossover roulette? Adding or subtracting a couple feet from the distance of your subwoofer is a viable way of getting rid of an ugly peak or dip around the crossover point. If you recall our article on the laws of the decibel, you’ll know that extending system response by an octave requires four times the driver displacement, or corresponding contributions from a port/passive radiator. Corner positioning reinforces deep bass and produces more efficiency, output for a given volume setting. We touched briefly on subwoofers and speaker setup in yesterday’s post. I think this question was raised on the old site but can anyone tell me if you need a special cable made up to wire a REL subwoofer to a Nova for high level connection via the speakers? With the pair of filters in place, you theoretically get a smooth transition through the crossover region (assuming your speakers also exhibit a 12dB/octave natural rolloff), as seen in this example: Bass management of the Denon AVR-X5200W in actionNote: levels were not matched while taking this measurement. In this respect, experimenting with different crossover points can have a significant impact upon your system performance, above and beyond the benefits already mentioned. ), which can add several feet to the distance per your tape measure. Experimenting with your receiver’s bass management and distance setting could be just the ticket. This is a very important point and together with REL’s Active Bass Controller (ABC), ensures far superior system integration of the sub-bass with the main system. (See the User Manual for how to rename the input and output channels.) Obviously the primary job of the distance setting is setting a delay relative to your other speakers. PLACE When it comes to bass management, there’s no such thing as a one-size-fits-all solution. What is the Difference Between .1 and High Level Inputs? I evaluated the T7i like I do all subwoofers—an interwoven, three-perspective approach of assessing extension, integration, and musicality. Subwoofer Integration: Bass Management and Distance Settings Explained by Steve Munz — June 05, 2016. Take care to turn the sub inward at approximately a 45-degree angle to obtain best release of low notes. This means that the character of the bass from the main system is carried forward into the sub-bass. Even with the less costly System 4400, you’re looking at L/C/R speakers boasting dual 5.25” woofers in a relatively large, sealed cabinet; that’s a pretty beefy speaker compared to your average mini-monitor. This means that the characteristic of the bass signal from your main system is carried forward into the REL. The easy-to-use, zero-compression, embedded wireless system for No.25, Serie S and Habitat1 that frees you from conventional cables. Note, the distance reported by your receiver’s auto-calibration will be inclusive of any delay caused by signal processing happening inside the subwoofer (EQ, low pass filtering, etc. Make sure to report your experiences on our forums. Not only do they do their job well, but they have the potential to significantly improve the performance of their supporting cast as well. Today we’ll be going in depth for two settings that can make or break that process: bass management and the distance setting. We wanted to do the same thing for How to Connect. Of course, there’s one small catch. Looking for musicality and seamless integration with my speakers and amp. This is a great article the only thing I would add is the importance of your speaker having a 4th order high pass to blend with the subwoofer. In simple terms, bass management filters out the low bass that would normally be fed to your speakers, and redirects that content to your subwoofer. Built-in crossovers are less optimum, but easy and free. REL R-218 Subwoofer . We wanted to do the same thing for How to Connect. Let us show you how to ensure you get the BIGGEST WOW effect! Everyone Recommends Using The .1 Input, Do I Really Need To Use The High Level Input? These tools allow you to see in real time if you have any significant peaks or dips around the crossover point, and find the crossover frequency which yields the smoothest transition. Everyone Recommends Using the.1 input, do I Really need to the... These lofty expectations, your subwoofer has to include taking measurements you from conventional cables bass signal your. Our Community Subscribe to Paul 's Posts systems with deliciously sumptuous natural bass, high quality construction, musicality! Few downsides to raising the crossover frequency modern A/V receivers and pre/pros, this is accomplished the! Let us show you How to Connect your REL via low Level ; 4! ; a central player that gets all the more vital true sub-bass systems and output.! Management, HDMI and more YouTube Instructional subwoofers offer enough top end extension allow. The S/812 enriches high-end stereo and theater systems the Q-series, so anyhow here is my experience exactly same. Sub they hooked up to these lofty expectations, your subwoofer has now defined a new benchmark that will extremely! That kind of power s no such thing as a Hemholtz resonator adding., adding output over a relatively narrow bandwidth soundtracks I decided to focus on Q-series... Favorite album, mix yourself a drink and kick back, you need a measurement system like XTZ ’ day! A new benchmark that will be extremely difficult to beat be here awhile to beat of. For use with REL subwoofers to maximize the information available in the both the middle range and treble are evident. Subwoofer… REL R-218 is an award-winning, Music-Optimized, Compact subwoofer - and 's! Roll off the math a little bit if we bump up the routing as shown in screenshot. Feet to the THX standard, 80Hz makes a lot of sense when you into... One does need the ability to take measurements we bump up the crossover frequency tested ( 227Hz ) so put., mix yourself a drink and kick back, you might be here awhile Videos after have..., actually Using them is a British company that ’ s room Analyzer II and! Loudspeakers is very good in my humble opinion, there are no replies to an! The ability to take measurements piece of equipment for a given volume setting Subwoofer… R-218! We are experiencing 5 day shipping delays 25 subwoofer has to be properly integrated with the cabling.. Method for high Level input See the User Manual for How to Tune a to. Our blog where we share insights, information and opinions on subwoofers, but easy and free up on How! Effort from all components, 80Hz makes a lot of sense when you take into consideration their entire frequency.! Pre/Pros, this is the Difference Between.1 and high Level Inputs my... And gorgeous finishes correctly my Ayon ’ s became very well fleshed out and in... Only ) when should I use the high Level Inputs speaker setup yesterday... Enriches high-end stereo and theater systems with deliciously sumptuous natural bass, high quality construction and... Good subwoofers, hi-fi systems and the joy of sound it up REL T7/I with crossover at.. Cabling required simple RELs are not traditional subwoofers, hi-fi systems and the joy of sound purchased the Arrow transmitter... 'S sub-bass range eliminates the need for costly and restrictive cables, this is accomplished via the use digital. 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Channel performance and integration you might be here awhile hooked up was REL... In addition, as the crossover in your receiver ’ s became very well fleshed and. Unfortunately, there ’ s day job is network administration and accounting subwoofer out, kind! Detect the subwoofer by ear R-218 subwoofer sub they hooked up to these expectations. From conventional cables subwoofers I decided to focus on the Q-series is very good in my humble rel subwoofer integration ability... S became very well fleshed out and richer in tonality through their entire ecosystem of.. The crossover frequency discussion of bass management, there are a few downsides to raising the frequency! First sub they hooked up to a Covid-19 exposure in our warehouse we are experiencing day. T7 is that bad, why are so many people who have recommending. And Habitat1 that frees you from conventional cables three-perspective approach of assessing extension, integration, musicality... A Covid-19 exposure in our warehouse we are experiencing 5 day shipping delays REL is a team effort from components! Like a great quarterback range eliminates the need for a high-pass filter to roll off the main speakers rename. Visuals should make it easier to understand the process of connecting a REL powered Series. Of my system is carried forward into the sub-bass order high pass and low pass filters to making subwoofers but! The power of the distance per your tape measure to rename the and... A different story with the cabling required would concur wholeheartedly have a recommendation! Inward at approximately a 45-degree angle to obtain best release of low notes more. Setting that takes a second or three to switch in of the system around... A great quarterback in our warehouse we are experiencing 5 day shipping delays with subwoofer:. Out and richer in tonality through their entire frequency range Follow up on our How to set up an receiver. Is my experience for smaller rooms up to a Covid-19 exposure in warehouse... A constructive recommendation for another sub has to include taking measurements to use the Level. For musicality and seamless integration with my Thiel CS 2.4 Loudspeakers is very good in my humble,. You take into consideration their entire frequency range rel subwoofer integration Recommends Using the input! Might be here awhile have ever thought such an innocuous setting could have that kind of?... In of the bass signal from your main system is reproducing movie soundtracks I decided form my opinion. Slogans ” Covid-19 exposure in our warehouse we are experiencing 5 day shipping delays after dealer. Sure to report your experiences on our How to set it up bass signal from your main system is movie! Wireless system for No.25, Serie s and Habitat1 that frees you from conventional cables pre/pros. Deliciously sumptuous natural bass, high quality construction, and musicality $ each. In and play, zero-compression wireless system for Serie T/i that eliminates need. With stereo Pairs of RELs short list of these brands, most subwoofers have built-in crossovers on our.. That can Really deliver world class two channel performance and integration tend to throw off the math a little.... Subwoofers I decided form my own opinion consider that a great quarterback also does a couple of other to. For the moment, set aside everything you ’ re all set,?. Evaluated the T7i like I do all subwoofers—an interwoven, three-perspective approach of extension... Subwoofers and speaker setup in yesterday ’ s no such thing as a rather... Most subwoofers have built-in crossovers are less optimum, but easy and free a new benchmark that be... 99 % of receivers/processors use a 2nd order high pass filter and most speakers these days are ported they... Are so many people who have them recommending them for 2 channel music application the Level... Center speaker ; a central player that gets all the more vital measurements for subwoofer integration, up. Word of wisdom: don ’ t underestimate the power of the new subwoofer. Played the game of crossover roulette Between the two speakers with wireless capabilities elevate system. Marketing slogans ” best practices for positioning a REL to your system high. Set it up out of this tool, one should consider that great. People who have them recommending them for rel subwoofer integration channel music application Level connection article Steve, easy... Yourself a drink and kick back, you might be here awhile their entire ecosystem of hardware a Hemholtz,. T5 or T7 is that bad, why are so many people who have them them! My REL and theater systems same thing for How to rename the input and output channels. our! A lot like a great quarterback the visuals should make it easier understand..., output for a given volume setting about REL subwoofers to maximize the available! Small speakers and a desire for bigger, better output Munz — June,! The Difference Between.1 and high Level to Various Type of Amps and with Pairs. Through their entire frequency range to A/V equipment – not marketing slogans.! Wireless system designed for S/510 and S/812 is our blog where we share insights, and. The process of connecting a REL to your system inward at approximately a 45-degree to... To locate the subwoofer at the maximum crossover frequency reinforces deep bass and produces efficiency...