BiAmp onkyo 818 - AVS Forum
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post #1 of 8 Old 11-28-2012, 08:08 PM - Thread Starter
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I have an onkyo 818 with 2 kef iq90 speakers and a powered subwoofer.

I am trying to run a phantom center, but i could not get any sound out of the subwoofer.

The subwoofer sounds fine during the audyssey setup, but it is mute afterwards. I picked biamp during audyssey setup.

thanks
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post #2 of 8 Old 11-29-2012, 05:15 AM
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Quote:
Originally Posted by csnbharathi View Post

I have an onkyo 818 with 2 kef iq90 speakers and a powered subwoofer.

I am trying to run a phantom center, but i could not get any sound out of the subwoofer.

The subwoofer sounds fine during the audyssey setup, but it is mute afterwards. I picked biamp during audyssey setup.

Why?

Why not just play it straight?
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post #3 of 8 Old 11-29-2012, 07:00 AM
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Are your speakers set to small to engage bass management? No sub on all sources, or just some?

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #4 of 8 Old 11-29-2012, 09:06 AM
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Passive bi-amping is totally useless. And make sure your mains are set to small.
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post #5 of 8 Old 11-29-2012, 02:08 PM - Thread Starter
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Quote:
Originally Posted by 4DHD View Post

Passive bi-amping is totally useless. And make sure your mains are set to small.
I am just starting to setup the HT, I have just one subwoofer connected to the 818 and have 2 iq90's connected for the front. I biamped it using the bi-amp (Hi freq) of left and right respectively. I am completly lost here

Quote:
Originally Posted by DonH50 View Post

Are your speakers set to small to engage bass management? No sub on all sources, or just some?

I did not change the odyssey setup, it is setup to small. I assume that if the speakers are set to a hz (Mine was 40hz) and not FULL BAND, then it is set to small, please correct me if i am wrong.
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post #6 of 8 Old 11-29-2012, 05:33 PM
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I do not have Audyssey so am not sure exactly how it is implemented on your AVR. A crossover of 40 Hz sounds awfully low to me... I realize the iQ90's are rated to 33 Hz, but with two 6.5" cones (about the equivalent of a single 9" cone) I suspect that is pushing it, and distortion may be high. I'd cross over up around 60 or 80 Hz and let the sub do its thing.

I would start by scrapping the bi-amp configuration (retain the wires if you wish, just tie both together at the AVR) and set that up first to get things running.

What is your source: CD, TV, what? Are you using optical, HDMI, analog inputs ??? And what sound mode(s) are you using? If the sub tests OK but no sound comes out in use then bass management is not working right, either due to a setup error or because you have selected a mode (direct or similar) that does not utilize the sub.

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post #7 of 8 Old 11-30-2012, 03:13 AM
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As suggested above, disconnect the bi-amp wiring (as there is nothing to gain) and raise the FL/FR crossovers up to 80Hz as doing so will have no negative impact on the Audyssey filters.

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post #8 of 8 Old 11-30-2012, 12:14 PM - Thread Starter
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I did raise the crossover to 80hz and it did make a huge difference. I removed the biamp and followed the speaker installation guide to connect the 2 binding post with the cable that came with the speakers.

Thanks all for putting some sense to the setup i have.

I tried playing a 5.1 flac and had no sound from the center channel, even though i turned off the center (Center=>none)
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