Originally Posted by FriendofSonic
I'm having issues with my SVS SB-1000 subwoofer. I hooked it up to the receiver, and I really have to crank it up to hear any sort of sound from the sub. I tried running YPAO to see if that would help, and nope. I'll try to provide the specifics of my setup but let me know if there's any other information I can provide...
Running about 50 foot of RCA cable from the LFE port on my sub to the Subwoofer 1 preout in the back of the receiver. When I ran YPAO, I set the volume on the sub at the halfway mark, gain to 0, and set the frequency to LFE. I suppose the test tone being sent to the sub was moderately loud, but it seems like the test tones for the speakers were louder. The center and fronts are at +1.5 and my backs are at +0.5 and +4.0 (I think YAPO set the second one to 4.0 because my back speakers are the ones that shoot two directions, and that speaker is pointed toward my kitchen, and I'm losing a lot of sound) Sub is set at +3.5.Speakers are all set as small. Crossover is at 80hz.
I found an adapter that lets me plug directly into my phone and gives me a red and white output. I played a song from my phone directly into the sub, and I could really hear the sub punch then. So I'm concerned about this, and this has been a tough issue for me to troubleshoot because I'm very new to home theater. I have heard Yamaha receivers have lower than usual preouts (1v) Is that causing my issue?
I have had similar issues, and if you do a search you'll find that many others have as well. On my old subwoofer, I thought it was mainly due to the peculiar setup required, but I recently got an SVS PB-1000 and it appears that my 773 defaults to not much bass at all. With the default YPAO settings, I had to turn the volume up rather a lot just to get the sub to come out of standby (I have now run a trigger wire.)
There's talk of low voltage on the sub out, but I don't see how that would matter if you run YPAO. The YPAO mic is measuring the actual output of the speakers and adjusting accordingly, so that should negate any potential lower output. What it might be doing is setting a flat response, whereas human hearing is not flat and is much less sensitive as the frequency gets lower. Actually, it probably isn't setting it flat, just not adjusting enough to make the perceived loudness flat for humans. This is pure speculation on my part, but something is going on here because the bass is really low with the unadjusted YPAO settings.
Some of this may have to do with our expectations of how much bass we should hear. Most people like strong bass, so we have to go from lower hearing response to where it's perceived as louder than the higher frequencies to get there--that's an increase of quite a few dB. Listening to music and movies flat as mastered may sound weak in bass to lots of people.
Here's what I did with my PB-1000. After running YPAO several times to get it where I wanted it, I have the sub volume at around 2 o'clock. YPAO set the sub at -4.5 dB. I adjusted this up to +2 or +3 dB (so I added 6 or 7 dB). I also currently have +2.5 dB on the sub trim, and another 1 dB on the bass tone control right now. Admittedly, the sub is running hot--these settings more than counterbalance the under-settings Yamaha set. At higher volumes, I will turn these down some to keep it under control, but at lower volumes it adds some richness to the sound. Others will strongly disagree with running a sub this hot, but I think YPAO is at least 6 dB low, so my settings aren't as hot as they seem. (I should also note that I have both sub outs on the 773 feeding into my sub in--some say this adds a bit to the signal, but I'm not sure. This is how I ran YPAO, so any increase was accounted for. The 673 only has one sub out, though.)
At higher volumes, I can get a lot of excursion on the sub. It's possible to make the sub thump hard, but it takes some rather large tweaks. I don't know what YPAO is doing by setting the sub so low, except that may it's paying more attention to a flat response than it is to human auditory response. The way I look at it is that as long as I can get there, then it's fine. Odd, but fine.
EDIT: It could also be related to setting the speakers to Large (which I then change to Small). Perhaps it expects some of the bass to be produced by the speakers. I partially discount this because YPAO can sense that my speakers don't give much output below 50 Hz. I nearly fully discount it when I add in the fact that it still set the sub low with my old satellites, which it set as small and which couldn't do anything below 100 Hz.Edited by ThinkRationally - 5/20/13 at 6:03am