AVS › AVS Forum › Audio › Receivers, Amps, and Processors › How do i connect a sub to the Onkyo TX SR876 ?
New Posts  All Forums:Forum Nav:

How do i connect a sub to the Onkyo TX SR876 ?

post #1 of 20
10/2/09 at 3:16pm
Thread Starter 
Hello, i want to connect a powered subwoofer to the 876, but the 876 has one pre-sub out and my sub has a L and R audio input plug.
So one wire from the Onkyo and no matter what plug i use, no sound !
The sub only "hums" a bit and it has a dB gauge but no reaction.
I looked inside the air vent port and see the amplifier, and from the L plug comes a white wire and from the R plug a red wire.
Those wires go the the amp.

So how do i connect the (mono) wire from the Onkyo to the 2 input plug sub ?

Thanks for any help..........
Reply
Reply

AVS Top Picks

post #2 of 20
10/2/09 at 3:32pm
Just connect it to one...it's not a stereo sub.
Reply
Reply
post #3 of 20
10/2/09 at 3:36pm
Sub out from 876 to left input on the sub. What sub is this. Usually on the left input on the sub it will also have LFE next to it. If that doesn't work you can get a splittler for the sub. That would be 2 males to 1 female. If that still doesn't work something may be wrong with the sub. Good luck and hope this helps.
Reply
Reply
post #4 of 20
10/2/09 at 3:41pm
Quote:
Originally Posted by CBdicX View Post

Hello, i want to connect a powered subwoofer to the 876, but the 876 has one pre-sub out and my sub has a L and R audio input plug.
So one wire from the Onkyo and no matter what plug i use, no sound !
The sub only "homs" a bit and it has a dB gauge but no reaction.
I looked inside the air vent port and see the amplifier, and from the L plug comes a white wire and from the R plug a red wire.
Those wires go the the amp.

So how do i connect the (mono) wire from the Onkyo to the 2 input plug sub ?

Thanks for any help..........

Make sure you are connecting the sub to the "subwoofer pre-out" jack and not the subwoofer analog input jack. The pre-out section is shaded in white. Since you have no sound with your current connection, I'd bet that is your problem. Good luck.
Reply
Reply
post #5 of 20
10/2/09 at 10:13pm
Thread Starter 
Quote:
Originally Posted by duvetyne View Post

Just connect it to one...it's not a stereo sub.

The sub has 2x 8 inch woofers (push-pull system) so i think you can see this as a stereo system..........
Reply
Reply
post #6 of 20
10/2/09 at 10:15pm
Thread Starter 
Quote:
Originally Posted by rpr2 View Post

Make sure you are connecting the sub to the "subwoofer pre-out" jack and not the subwoofer analog input jack. The pre-out section is shaded in white. Since you have no sound with your current connection, I'd bet that is your problem. Good luck.

Its connected to the pre-out, had an other (elac) sub running so the cable never came off the Onkyo.
Reply
Reply
post #7 of 20
10/2/09 at 10:18pm
Thread Starter 
Quote:
Originally Posted by phantom52 View Post

Sub out from 876 to left input on the sub. What sub is this. Usually on the left input on the sub it will also have LFE next to it. If that doesn't work you can get a splittler for the sub. That would be 2 males to 1 female. If that still doesn't work something may be wrong with the sub. Good luck and hope this helps.

Think i have to try a splitter as there are two wires running from the plugs to the amp of the sub.

The sub is a TMA Twister 4000 ($1850 2 years back):


http://tmaaudio.com/twister4000.html
Reply
Reply
post #8 of 20
10/3/09 at 5:41am
Quote:
Originally Posted by CBdicX View Post

The sub has 2x 8 inch woofers (push-pull system) so i think you can see this as a stereo system..........

Both woofers are still receiving a mono signal. The left and right inputs are summed internally.
Reply
Reply
post #9 of 20
10/3/09 at 6:04am
Thread Starter 
Quote:
Originally Posted by Easyaspie View Post

Both woofers are still receiving a mono signal. The left and right inputs are summed internally.

You are right MY MASTER :-)
Its working........
I had it also working yesterday but this big sub is almost not working when it is not receiving any low freq. signal. (at least i could not detect it working yesterday)
My previous sub (elac 303 eps) was working in the mid-low range, this TMA sub will only be at work in the lower and lowest range.
Better for me as i found the Elac to be to much in "normal" music, or i had to put the level way down with music, and up again with a movie.
The TMA is working perfect and wall trembling in movie effects, but almost not there with standard music or TV :-)
Reply
Reply
post #10 of 20
10/3/09 at 7:14am
Quote:
Originally Posted by CBdicX View Post

The sub has 2x 8 inch woofers (push-pull system) so i think you can see this as a stereo system..........


OK then
Reply
Reply
post #11 of 20
10/3/09 at 7:53am
Quote:
Originally Posted by CBdicX View Post

You are right MY MASTER :-)
Its working........
I had it also working yesterday but this big sub is almost not working when it is not receiving any low freq. signal. (at least i could not detect it working yesterday)
My previous sub (elac 303 eps) was working in the mid-low range, this TMA sub will only be at work in the lower and lowest range.
Better for me as i found the Elac to be to much in "normal" music, or i had to put the level way down with music, and up again with a movie.
The TMA is working perfect and wall trembling in movie effects, but almost not there with standard music or TV :-)

What are the settings on the sub (crossover and volume)? What is the the LFE on the 876 set at? Did you run Audyssey? If you did not run Audyssey you might want to check over at the Audyssey thread. Here is a link to the Audyssey thread and also the Audyssey setup guide.

http://www.avsforum.com/avs-vb/showthread.php?t=795421

http://www.avsforum.com/avs-vb/showt...5#post14456895

I found both these threads to be very helpful thanks to member Giomania's hard work. I had LFE setting with my 886 set incorrectly at 80Hz, it is recommended to be at 120Hz. After changing the setting and rerunning Audyssey I found bass response to be much better. I have found that with a setting or two set incorrectly it can really throw off the SQ of your system.

Bill
Reply
Reply
post #12 of 20
10/3/09 at 8:35am
Thread Starter 
Quote:
Originally Posted by Bill Mac View Post

What are the settings on the sub (crossover and volume)? What is the the LFE on the 876 set at? Did you run Audyssey? If you did not run Audyssey you might want to check over at the Audyssey thread. Here is a link to the Audyssey thread and also the Audyssey setup guide.

http://www.avsforum.com/avs-vb/showthread.php?t=795421

http://www.avsforum.com/avs-vb/showt...5#post14456895

I found both these threads to be very helpful thanks to member Giomania's hard work. I had LFE setting with my 886 set incorrectly at 80Hz, it is recommended to be at 120Hz. After changing the setting and rerunning Audyssey I found bass response to be much better. I have found that with a setting or two set incorrectly it can really throw off the SQ of your system.

Bill

Crossover of the sub is at 50 Hz (can go to 250 Hz) and volume is about 30%, when i go higher in volume it starts to make an earthquake ;-)
LPF is now 120 Hz (had it on 80 Hz) and all other speakers, 4x Elac FS 207.2 and Canton CD50 center, are 80 Hz THX.
The sub will do 19 Hz (200 watt) and the Elac's will do 30 Hz / 50.000 Hz.
Reply
Reply
post #13 of 20
10/3/09 at 8:54am
You should set the crossover on the sub to it's highest setting to basically take it out of the equation. Let the AVR do all of the crossover functions.

That is why most subs have an LFE input. This input bypasses the crossover within the sub. What could essentially happen is you create a hole in the FR of your system. There are other issues too.
Reply
Reply
post #14 of 20
10/3/09 at 9:04am
Thread Starter 
Quote:
Originally Posted by Easyaspie View Post

You should set the crossover on the sub to it's highest setting to basically take it out of the equation. Let the AVR do all of the crossover functions.

That is why most subs have an LFE input. This input bypasses the crossover within the sub. What could essentially happen is you create a hole in the FR of your system. There are other issues too.

Why should i not set the LPF and the sub to the lowest setting possible ?
I want low bass......
So you say set the LPF to 120 Hz as suggested by Bill Mac, and the sub crossover to 250 Hz. (other speakers to 80 Hz)

Will this not create a less lower bass ?
Reply
Reply
post #15 of 20
10/3/09 at 9:46am
Quote:
Originally Posted by CBdicX View Post

Why should i not set the LPF and the sub to the lowest setting possible ?
I want low bass......
So you say set the LPF to 120 Hz as suggested by Bill Mac, and the sub crossover to 250 Hz. (other speakers to 80 Hz)

Will this not create a less lower bass ?

CBdicX,

Easyaspie is correct in his post as per the Audyssey thread you need to take the subs crossover out of the loop and let the 876 do it. If you think about it with your sub set at 50Hz the frequencies above that (50-120Hz) are not playing. This might be why you get very poor bass with standard TV (non DD with no .1 LFE output) and with 2 CH music that does not have a LFE (.1) channel.

I have my system setup as the Audyssey setup guide and as Easyaspie suggests. I get excellent low bass response with 5.1, non DD TV and 2 CH music. Of course it would be better if I had a SMS-1 or similar device to flatten out the response but I am happy with the SQ as is. Give it a try you have nothing to lose but better low bass response.

Bill
Reply
Reply
post #16 of 20
10/3/09 at 9:58am
Quote:
Originally Posted by CBdicX View Post

Why should i not set the LPF and the sub to the lowest setting possible ?
I want low bass......
So you say set the LPF to 120 Hz as suggested by Bill Mac, and the sub crossover to 250 Hz. (other speakers to 80 Hz)

Will this not create a less lower bass ?

To add a little bit to what Bill said, the LPF and HPFs are exactly what they sound like: low pass and high pass filters.

Only frequencies above a high pass filter pass and only frequencies below a low pass filter pass.

What will happen to the frequencies above your sub's LPF and below your AVR's HPF? They will be lost or at least rolled off to inaudible levels.

BTW, I should have corrected it earlier, but the main speaker outputs on an AVR are HPF, not LPF.
Reply
Reply
post #17 of 20
10/3/09 at 11:56am
Thread Starter 
Hi Bill and Easyaspie, sorry to say but i am lost in translation.......
I am from Holland and are trying to understand what you are saying.
Its difficult for me to get thinks in the right order, so please tell me:

1) What must be the LPF setting on the Onkyo for the Sub

2) what must be the Hz setting for the other 4 Elacs and mid speaker

3) what must the crossover be on the sub (scale from 50 to 250 Hz)

I did use Audyssey but thats a 1/2 year ago with an other sub.
If i do Audyssey again, should i use the numbers that Audyssey will get or your adviced numbers for the Hz setting.
Reply
Reply
post #18 of 20
10/3/09 at 12:35pm
Quote:
Originally Posted by CBdicX View Post

Hi Bill and Easyaspie, sorry to say but i am lost in translation.......
I am from Holland and are trying to understand what you are saying.
Its difficult for me to get thinks in the right order, so please tell me:

1) What must be the LPF setting on the Onkyo for the Sub

2) what must be the Hz setting for the other 4 Elacs and mid speaker

3) what must the crossover be on the sub (scale from 50 to 250 Hz)

I did use Audyssey but thats a 1/2 year ago with an other sub.
If i do Audyssey again, should i use the numbers that Audyssey will get or your adviced numbers for the Hz setting.

CBdicX,

Not a problem, I understand.

1) Set the LPF of the 876 to 120Hz.

2) I would set them from 60-80Hz per the Audyssey setup guide. Then run Audyssey again as you are using a different sub. After running Audyssey see what the settings are for your main speakers. In the Audyssey setup guide it mentions that raising a speakers crossover is not a problem but lowering it can be.

3) Set your subs crossover to 250Hz which appears to be the highest setting.

I normally stay with the selected crossover setting that is selected after Audyssey is run. I can not stress enough that you read through the Audyssey setup guide before doing another Audyssey calibration. I found it extremely helpful especially the suggested placement of the mic and taking 8 measuremnts.
Reply
Reply
post #19 of 20
10/3/09 at 12:45pm
Thread Starter 
Quote:
Originally Posted by Bill Mac View Post

CBdicX,

Not a problem, I understand.

1) Set the LPF of the 876 to 120Hz.

2) I would set them from 60-80Hz per the Audyssey setup guide. Then run Audyssey again as you are using a different sub. After running Audyssey see what the settings are for your main speakers. In the Audyssey setup guide it mentions that raising a speakers crossover is not a problem but lowering it can be.

3) Set your subs crossover to 250Hz which appears to be the highest setting.

I normally stay with the selected crossover setting that is selected after Audyssey is run. I can not stress enough that you read through the Audyssey setup guide before doing another Audyssey calibration. I found it extremely helpful especially the suggested placement of the mic and taking 8 measuremnts.

Thank you for your very quick reply :-)

I will read the Audyssey setup guide and hope i can get it to run to my liking.
First of all i will set the Onkyo LPF to 120 Hz and turn up the crossover on the sub to the highest level of 250 Hz.
Reply
Reply
post #20 of 20
10/3/09 at 12:59pm
Quote:
Originally Posted by CBdicX View Post

Thank you for your very quick reply :-)

I will read the Audyssey setup guide and hope i can get it to run to my liking.
First of all i will set the Onkyo LPF to 120 Hz and turn up the crossover on the sub to the highest level of 250 Hz.

My pleasure. Using those settings will be a good place to start. Many members here have helped me with this same issue. I was using similar settings that you were using originally but changed them after some very helpful advice.

Bill
Reply
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Receivers, Amps, and Processors

AVS Top Picks

AVS › AVS Forum › Audio › Receivers, Amps, and Processors › How do i connect a sub to the Onkyo TX SR876 ?