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Newbie needs help connecting external amp to Yamaha RX-V765

post #1 of 11
Thread Starter 
Hey everyone. I just recently bought a used Adcom GFA-545 amplifier from my boss. I'm currently only running a 2-speaker setup with my RX-V765. I have two, old Orion Cobalt 10" DVC subs in a custom box that I wanted to use as a subwoofer in addition to my 2 front speakers. I plugged the Adcom into the subwoofer 1 and 2 outputs on the back of the RX-V765 using a standard RCA cable. When I run the auto speaker setup using the supplied microphone I get sound out of the subs and they seem to work just fine. However, when I play music from my computer there is no sound from the subs at all. I'm using an optical cable from my computer to my AV 4 input on the RX-V765.

The manual says that it always sends a signal out of the subwoofer 1 and 2 outputs in addition to the 'speaker' outputs so I'm confused why it's not working when I play audio from my computer. I also fired up the Xbox 360 and there's still no sound from the subs.

Any advice? Thanks.

Jeff
post #2 of 11
You need to change the setting on your receiver to play bass out of both front and sub outputs. By default it is not enabled on most any receiver.
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post #3 of 11
Quote:
Originally Posted by jsramair View Post

I plugged the Adcom into the subwoofer 1 and 2 outputs on the back of the RX-V765 using a standard RCA cable

Any advice? Thanks.
Per your Owners Manual there are no sub-woffer outputs on your receiver, Only inputs.






So, where are you connecting your subs?
Edited by billbartuska - 10/6/15 at 5:51pm
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post #4 of 11
Oh, and by the way, toss that Yamaha in the trash. Is much as I love Yamaha, that Adcom is in a whole other league sound quality wise.

Perhaps use the Yamaha to drive the subs...............if you really want to keep it.
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post #5 of 11
Thread Starter 
billbartuska: There are two sub outputs in the very bottom right corner, labeled '1' and '2'. That's what I'm using.

DzillaXx: That thought had crossed my mind but haven't found anything in the manual. I'll check again.

I've noticed a problem...I have my receiver set to play in '2 channel stereo' mode. This would obviously only play sound through the front L and R speakers. I can't seem to find the right mode to play front L and R plus a sub.
Edited by jsramair - 10/6/15 at 6:42pm
post #6 of 11
Quote:
Originally Posted by billbartuska View Post

Per your Owners Manual there are no sub-woffer outputs on your receiver, Only inputs.






So, where are you connecting your subs?

If you look, he has pre outs.


Though I would agree, You really don't need the Yamaha as you are only doing a stereo setup.


Though for a living rooms setup 5.1 can not be beat. Pretty much all content on TV is 5.1, along with many Netflix/Prime Content and all Modern Video Games. 5.1 is very worthwhile over stereo in those type of setups. Music is best in stereo.
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post #7 of 11
Thread Starter 
I used to have a 7.0 surround sound setup with this Yamaha at a previous residence. I still have all the speakers, I'm just using 2 for now since I currently have hardwood floors and am unable to figure out how to run the wires without drilling holes in my floors. I may use my 7.1 (now that I have a sub) again one day, so I'll be keeping the Yamaha. I'm no audiophile so it's good enough for me.

Thanks DzillaXx for your help. Your simple statement got me wondering and eventually I found a hidden (to me) menu under manual speaker setup that allowed me to get the setup working properly. Although it should have worked anyway since, under setup, the receiver was already set to send low frequencies to both the fronts and sub but for some reason wasn't. Once I selected 'small' front speakers instead of 'large' the subs took over the low frequencies.

Jeff
post #8 of 11
Well, how does your setup sound now?
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post #9 of 11
Quote:
Originally Posted by jsramair View Post

Hey everyone. I just recently bought a used Adcom GFA-545 amplifier from my boss. I'm currently only running a 2-speaker setup with my RX-V765. I have two, old Orion Cobalt 10" DVC subs in a custom box that I wanted to use as a subwoofer in addition to my 2 front speakers. I plugged the Adcom into the subwoofer 1 and 2 outputs on the back of the RX-V765 using a standard RCA cable. When I run the auto speaker setup using the supplied microphone I get sound out of the subs and they seem to work just fine. However, when I play music from my computer there is no sound from the subs at all. I'm using an optical cable from my computer to my AV 4 input on the RX-V765.

The manual says that it always sends a signal out of the subwoofer 1 and 2 outputs in addition to the 'speaker' outputs so I'm confused why it's not working when I play audio from my computer. I also fired up the Xbox 360 and there's still no sound from the subs.

Any advice? Thanks.

Jeff

In your computer's audio control panel, do you have DDL (Dolby Digital Live) or DTS-Connect enabled?
Make sure you do not have DDL or DTS-Connect enabled and the computer audio is set to 2-channel or 2 Speaker output.
Also make sure whatever program you use to play audio is also set for 2-channel, if it has any settings for that.

Is the Yamaha updated to the latest firmware?
Have you tired doing a reset (default setup) with the Yamaha and then double check every setting in the Yamaha Menu (interface)?
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post #10 of 11
Thread Starter 
billbartuska: Sounds better. Still tweaking it a bit.

Tacoboy: Problem is solved. Thanks.
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