Help with dual passive sub hookup to old reciever - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 25 Old 03-10-14, 12:20 PM
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Re: Help with dual passive sub hookup to old reciever

The sub out on your current receiver only does the crossover not the HPF usually sub amps have a HPF built in that filters out anything below a set number IE: 15Hz
People using that amp are also likely not getting the full potential out of the sub but also that dedicated amp will actually likely hit 100Watts Bridged.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #12 of 25 Old 03-13-14, 10:28 AM Thread Starter
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Re: Help with dual passive sub hookup to old reciever

Thanks Tony, now I get it. I may still give the old Pioneer a try, I have it and it's free. If I don't like what I hear it's either that they are underpowered or bogged down by low frequencies they can't handle. Cheap, powerfull amps seems pretty common, it's the HPF feature that seem a little more difficult to find.

Maybe there's something that could be done on the main receiver end. I just received a spanking new Denon avr-x4000. I'm so busy with the whole building the HT room thing that I barely found time to open the box.
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post #13 of 25 Old 03-13-14, 11:00 AM
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+1 on all tony said. Just thought I'd add that you COULD use in line high/low pass filters like in car audio. They have female RCA ends, and Parts express has a good selection.
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post #14 of 25 Old 03-13-14, 11:05 AM
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Re: Help with dual passive sub hookup to old reciever

Given he has a new Denon 4520 sitting and waiting to be used he is good to go on that end

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #15 of 25 Old 03-13-14, 11:57 AM Thread Starter
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Re: Help with dual passive sub hookup to old reciever

Thanks for the tip. I was wondering why you put the word COULD in capitals. After a little research, it seems that these in-line filters are a little contreversial. People are saying that they may attenuate the signal and something about mismatching input impedance impacting crossover... Reminds me of the lens filter/no-filter debate on DSLR forums.
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post #16 of 25 Old 03-13-14, 11:58 AM Thread Starter
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Re: Help with dual passive sub hookup to old reciever

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tonyvdb wrote: View Post
Given he has a new Denon 4520 sitting and waiting to be used he is good to go on that end
Are you saying that the sub out on the Denon x4000 does HPF? I read that it's there for the amplified outputs.
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post #17 of 25 Old 03-13-14, 12:45 PM
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Re: Help with dual passive sub hookup to old reciever

No receiver has a HPF on the sub out. Most subs have that built on the plate amp. In your case you wont have one unless you get a proper external amp with one built in.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #18 of 25 Old 03-13-14, 12:54 PM
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I don't believe the denon will do any hpf out of the LFE. That's mainly what I meant by my suggestion of the in line thing. I used caps to reflect how I MIGHT say that vocally, indicating they might be a last ditch effort. My thinking was that since you won't be using a "sub" amp that it would not have a subsonic filter, to protect your drivers. The part that's above my pay grade is, the freq response of the "VCR" inputs might only be 20-20k. I'm not sure what would happen to content below 20hz.
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post #19 of 25 Old 03-21-14, 12:33 PM
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Re: Help with dual passive sub hookup to old reciever

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maverick_goose wrote: View Post
I'm set on buying a pair of 10 inch Monoprice passive in-wall subs and I'm not sure if I could use my old receiver as a dedicated amp for them.

Here's how I understand it but I'm not sure if it will work or if there's not a more suited solution as I have never done this before.

So I would be connecting both subwoofer outs from my new receiver (presumably a Yamaha RX-A830 or another similar 7.2 receiver, I have yet to decide) to two rca inputs on my old Pioneer VSX-D1S. I'm guessing I would need a "Y" splitter to split the subwoofer out of my new reciever to connect to both left and right inputs on the old receiver. On the attached image I would be using VCR 1 and 2 inputs on the old receiver as signal in.

Then I would use speaker cables to hookup the front speaker output of my left and right channels to each of the two subs.

I would then set the old receivers volume at a balanced volume and leave it there using the new receiver for general volume adjustment (including the sub).

I'm no expert so any input is appreciated.
M-G,

You are making this too hard.

Referencing the picture you provided (thanks BTW) near the center of the picture are two sets of jumpers from Pre-Amp out to Power In with the bottom set labeled "Front Amp" (I can not see the label for the top set).

To use this AVR purely as a sub-power amp (i.e. bypass pre-amp):
1) Remove both sets of jumpers.
2) Run one RX-A830 sub-out (subout#1) through a Y-splitter into the Front Amp Power-In L/R input and the other RX-A830 sub-out (subout #2) through a Y splitter into the upper (label?) Power-In L/R inputs. These connect directly to the AVRs power amp section bypassing the pre-amp section.
3) Then connect speaker wire to the set of amps/speaker outputs these two Power-In inputs support and you are done.

If you want to use the pre-amp section:
a) Don't remove the jumpers. You will only need one set of connections; i.e. subout #1 into the L input of your choice (i.e. VCR 1) and subout #2 into R input of the same set (i.e. VCR 1).
b) Then select an "all channel stereo" mode (assuming the VSX-D1S has one) to force the AVR to output the sub-signal to two sets of AVR amplifiers (i.e. L/R Front and Surround L/R).
c) Connect speaker wires to these speaker outputs.

Post or PM if I have left these waters too muddy

Cheers,
Shamu

Last edited by XEagleDriver; 03-21-14 at 12:38 PM. Reason: Added a PS on amp quality
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post #20 of 25 Old 03-21-14, 12:38 PM
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Re: Help with dual passive sub hookup to old reciever

P.S. The old reviews I found online for the VSX-D1S spoke very highly of its power amps and it should be able to power your passive sub quite well.
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