Dual Subwoofers with 3.7s

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Re: Dual Subwoofers with 3.7s
« Reply #20 on: 8 May 2019, 06:30 pm »
Really nice carbon 10 inch woofer on those REL subs.  Reminds me of the current Totem 8 inch Kin subwoofer.

I used a dual 7 inch sub with my 1.6's, but that's a world away from the 3.7's.


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Re: Dual Subwoofers with 3.7s
« Reply #21 on: 8 May 2019, 08:13 pm »
It’s been a while since I’ve posted here, but I have had some experience with subs and Maggie’s.

I have a biamped pair of 3.6’s with a ModWright KWA150SE powering the mids and highs and a pair of Bryston 7B SST’s for the lows.  I used a pair of subs, a Velodyne DD15 and a DD12 as a slave sub, for about 10 years.  Then my DD15 buzzed and off it went.  It was strange, as I wasn’t playing anything at the time.  What a blessing that was, as it allowed me to purchase my REL subs.

I bought one REL S/5 SHO sub about a month ago.  I put it one corner of my room and use the high level input cable connected to a Bryston amp.  Adjustment was fairly easy, but it took some time.  Bass is seamless, accurate and extends.  As I told my dealer, it’s as if I had full range Maggie’s.  One was quite enough IMO. However, I just added a second S/5 about a week ago.  It’s located in the opposite corner of the room and about ten feet away from the right 3.6.  It’s connected using REL’s Longbow Bluetooth transmitter which is  absolutely incredible and easy to set up.  OMG is all I need to say.  My HT has never sounded this good with such impact.  I’ll add the DD 12 back into the system as a dedicated center channel sub for my tricenter setup using a pair of MG 10’s and a CC3.  I have 1.6’s as my surrounds, and the REL’s complement them as well.

I’ve wanted a REL for a while, and I’m glad I took the plunge.  Please read the reviews on the S/5.  Buy any REL from a dealer and take advantage of their 60-day trial.  Trust me, they won’t be going anywhere.


Re: Dual Subwoofers with 3.7s
« Reply #22 on: 12 May 2019, 11:43 pm »
FWIW, my vote goes to OB/Dipole subs to mate with Magggies for best music integration.

I have tried various box subs over the years (dual Martin Logan Servo Descent I's, M&K's, Rels, Magellan/TBI transmission line subs, etc.), but they never blended seamlessly for me so they were either repurposed for HT, returned, sold or turned into dust collectors.  They would always show themselves when you try different volume combinations or content selections.  What setting/configuration would blend well in one scenario would not in another.  The TBI's were nice at low volumes, but would not keep up with the Maggies when you turn up the volume.  Port chuffing became the wart at increased volumes and they all gave localization queues which drew attention to themselves.  I understand that TBI has made mods since to address the port chuffing, but haven't tried their newer models.

If you want something to blend well with OB/Dipoles, I assume you have to extend similar design characteristics throughout the frequency range, else the relative levels will not match as SPL changes.  It is also beneficial to match line sources with line sources and point sources with point sources for similar reasons based on SPL reduction over distance.

I have been playing with 2 - 12" GR Research Dipole Servo subs both with the Rythmik Servo Amp (hardware low pass dipole roll off shelf and servo) and an ICEPower ASP1000 amp (software low pass dipole roll off shelf with no servo).  Both have given the best integration to date with my Magnepan 20.1's.  I am using a Marchand XM44 XO to cross them over with symmetric 40Hz/48dB slopes.  I am getting relatively flat in-room seamless responses down to 13 Hz.  After testing these in different OB cabinets and getting the results I have, I have placed another driver on order to make the double into a triple and will possibly add another triple (for stereo) when time and budget permits.

They seem to track with volume changes as well as content changes and do not provide localizations in my venue like the other box subs that I have tried.  They have added tangible bass at low volume levels which is something I have never been able to do with Maggies without cranking the volume.  In short, I am very happy with their integration (best I have heard) to date and don't feel I will be turning them off because of content specific or SPL level miss-matches for music.

FWIW, I am currently running the 2 drivers in a triple 1.5" thick (sides, center, shelves) MDF H-Frame cabinet that weighs a ton and has no flex.  All joints have dados.

« Last Edit: 22 May 2019, 06:21 am by emailtim »


Re: Dual Subwoofers with 3.7s
« Reply #23 on: 22 May 2019, 06:22 am »
UPDATE to my previous post: 

Got the 3rd driver last week to fill out the triple H-Frame.  Good stuff.

Here is an in-room response plot.  Usable sub-bass down to 13Hz.