LFE and Stereo subs using one minidsp?

oneartist

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Apr 7, 2023
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Preamp, Processor or Receiver
Lyngdorf MP60 2.1
Main Amp
Musical Fidelity M8 500
Additional Amp
Odyssey Stratus
Other Amp
ond NAD Stereo
Computer Audio
Apple Logic Pro
Universal / Blu-ray / CD Player
Oppo 205
Front Speakers
Magnepan 3.6
Center Channel Speaker
Mackie 874 monitor
Surround Speakers
Magnepan 1.7
Surround Back Speakers
Magnepan Mc1
Subwoofers
Rythmik F12SE, GR Research Open Baffle, REL T/5x
Video Display Device
LG 65 "
Screen
OLED
Streaming Equipment
MP 60 2.1
Streaming Subscriptions
Audirvana Studio, Tidal
It seems like this process would require three imputs and minidsp only has two. Would it be possible to Y connect the two stereo channels to make this work? I've already combined my four subs using one LFE out from Lyngdorf MP60 2.1. I would like to try to make my front two Rythmik F12 sealed subs as stereo to pair to go with front Magnepan 3.6 speakers and use two wireless REL T/5x subs as LFE. Any suggestions appreciated. I know I could do this using two minidsp units but REW will only combine outputs from one minidsp.
 

AudiocRaver

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Nov 21, 2016
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957
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North Carolina, USA
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Preamp, Processor or Receiver
Onkyo TX-SR705 Receiver
Main Amp
Crown XLS 1502 DriveCore-2 (x2 as monoblock)
Additional Amp
Behringer A500 Reference Power Amplifier
Front Speakers
MartinLogan Electromotion ESL Electrostatic (x2)
Center Channel Speaker
Phantom Center
Surround Speakers
NSM Audio Model 5 2-Way (x2)
Subwoofers
JBL ES150P Powered Subwoofer (x2)
Here is an idea that might work.

I am using 2 inputs of a trusty minidsp DDRC88BM, with 8 in and 8 out. The L and R Mains (MartinLogan) are set to Large in my AVR and the minidsp crossover for each is set at 48 db/oct, then routed to two outputs each, 4 total (L main, L sub, R main, R sub). This much would match your suggested configuration, I believe. That keeps most of the low frequencies out of the mains, as it sounds like you are trying to accomplish as well, reducing misc vibration of the panels and improving imaging immensely! In my system, the two mains outputs each go to a stereo power amp bi-amping each of the mains (with crossover shorting bars removed, obviously). Kinda like a pair of stereo power amps effectively used as "monoblocks," one for L main above 80 hz and the other for R main above 80 hz.

This should be doable with any smaller 2-in 4-out minidsp unit and a pair of L and R subs, and will even allow for independent time alignment tweaks of the stereo subs for smooth crossover measurements.

Then the center and surrounds are all set to Small settings in the AVR, so the single subwoofer output from the AVR is carrying the LFE audio plus the LF audio from all of the other speakers in the system and can go directly to the other pair of subwoofers with a y-cable.
 

AudiocRaver

Senior Reviewer
Staff member
Joined
Nov 21, 2016
Messages
957
Location
North Carolina, USA
More  
Preamp, Processor or Receiver
Onkyo TX-SR705 Receiver
Main Amp
Crown XLS 1502 DriveCore-2 (x2 as monoblock)
Additional Amp
Behringer A500 Reference Power Amplifier
Front Speakers
MartinLogan Electromotion ESL Electrostatic (x2)
Center Channel Speaker
Phantom Center
Surround Speakers
NSM Audio Model 5 2-Way (x2)
Subwoofers
JBL ES150P Powered Subwoofer (x2)
Then the center and surrounds are all set to Small settings in the AVR, so the single subwoofer output from the AVR is carrying the LFE audio plus the LF audio from all of the other speakers in the system and can go directly to the other pair of subwoofers with a y-cable.
An additional note: If this combined LFE plus LF-from-surrounds signal needs timing compensation beyond what your main processor can provide, THEN you will need a third processing channel to accomplish that. In my system I actually have only 2 subs. The 2 subs each have 2 inputs, and I treat then as independent subs. So I kinda have 4 subs from the two, and I use 4 "subwoofer" outputs from the minidsp DDRC88BM for additional timing tweaks.

Hope this all helps.
 

WesleyBurks

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Joined
Sep 4, 2023
Messages
1
Here is an idea that might work.

I am using 2 inputs of a trusty minidsp DDRC88BM, with 8 in and 8 out. The L and R Mains (MartinLogan) are set to Large in my AVR and the minidsp crossover for each is set at 48 db/oct, then routed to two outputs each, 4 total (L main, L sub, R main, R sub). This much would match your suggested configuration, I believe. That keeps most of the low frequencies out of the mains, as it sounds like you are trying to accomplish as well, reducing misc vibration of the panels and improving imaging immensely! In my system, the two mains outputs each go to a stereo power amp bi-amping each of the mains (with crossover shorting bars removed, obviously). Kinda like a pair of stereo power amps effectively used as "monoblocks," one for L main above 80 hz and the other for R main above 80 hz.

This should be doable with any smaller 2-in 4-out minidsp unit and a pair of L and R subs, and will even allow for independent time alignment tweaks of the stereo subs for smooth crossover measurements.

Then the center and surrounds are all set to Small settings in the AVR, so the single subwoofer output from the AVR is carrying the LFE audio plus the LF audio from all of the other speakers in the system and can go directly to the other pair of subwoofers with a y-cable.
Thanks for the advice, I appreciate you.
 
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