Originally Posted by Islandborn
Just to clarify. I thought it was not advised to change settings in the subs DSP if using your AVR's room correction like Audyssey? Does it not change the sound dynamics of the subs and room eq negatively if doing this? I was under the impression that bumping the gain on the AVR for more sub output AKA "Running hot" was pretty much the only setting advisable? I still have to read up on Mike's guide though....
Originally Posted by homwerk
First time in this SVS owners thread. I have a question about the PC-4000 I was hoping I could get answered. I'm still looking for a subwoofer or two to pair with my current setup. I currently have a full Chane setup, a5.4s in the front with a 2.4 for the center and 1.4s for the rears. I am running everything with a Denon AVR-X3400H. For reference purposes my room is about 17x35 and 8' ceilings throughout. It opens up on one side towards the front in sort of an upside down "L". The opening is about 6' wide by 6' long and opens up to another 15x17 room. Right now I have an older Outlaw Audio LFM-1 EX that is providing all the bass.
In my last house the LFM-1 EX was great, but that room was only 14x16 - in this house it's a little underwhelming.
I have two questions for you guys if that's OK.
1. Is the PC-4000 a worthy upgrade over the LFM-1 EX? I have checked the outputs of both and the PC-4000 numbers look great but I don't know how much better 2-4 DB really is. I prefer the down-firing subs due to puppy and small kids.
2. The electronics on the PC-4000 seem really cool. My wife and I watch movies when our kids go to sleep and the ability to easily turn up and down the sub volume sounds like a great feature. I don't know how this works in real life though.
In the end, I would want to get two subs. One of which will be in front of us, and the second one would be behind us and I'd have to use a wireless sub setup I think.
Budget is not really an issue, but i'd probalby like to get a single first and then get the second later. Unless there is a great Black Friday sale for them that is.
Thanks in advance for any advice.
Since both of these questions may involve the 4000 series subwoofers, and since both posters have Audyssey, I would like to try to answer with one post if I may. First, it is perfectly fine to use your DSP to fine-tune the sound in any way you like, once you have run Audyssey. Audyssey is trying to eliminate random peaks and dips in the frequency response. But, if someone chooses to put in a peak at 27Hz, or at 63Hz for instance, because it sounds better to him, there is absolutely nothing wrong with that. I think we definitely want to let Audyssey try to do its job of correcting the FR, as best it can. But afterwards, it's strictly user preference with respect to both settings and the use of the DSP in your subs.
With respect to the PC4000, even a single PC4000 would be a nice upgrade over the Outlaw subwoofer above 40Hz. A 3db increase in available SPL would equate to a greater than 30% increase in perceived loudness. Dual PC4000's would have a good bit more than double the loudness of a single Outlaw above 40Hz.
But, it is in the low-frequencies where the PC4000's would really pull away from the Outlaw sub. With your permission, I won't try to explain exactly how our perception of loudness changes below 70Hz and especially below 30Hz. But, I will note that at 25Hz a single PC4000 would be more than twice as loud as the Outlaw sub. Dual PC4000's would be more than 4 times as loud. At 20Hz and at 16Hz, a single PC4000 would be 4 times as loud, and dual PC4000's would be about 6 times as loud. Please bear with me on the math--those estimates are just ballpark.
It may help to explain things that way rather than just to say that with both the single Outlaw and the single PC4000 in one-port mode, the PC4000 will have ~10db more output at 20Hz and at 16Hz. (For the record, <30Hz a 5db increase in SPL is perceived as a doubling in loudness.) Sometimes, when we don't know how significant a 3 or 4db increase in SPL actually is, it may be helpful to think of it in terms of perceived loudness. The PC4000's will also generate a good deal more low-bass tactile response, due to the combined action of the increased SPL, and the ports moving more air at low-frequencies.
The PC4000's will be a big
upgrade over your current LFM-1EX. If you want to compare some numbers, Audioholics reviewed and measured both subwoofers. (The PC4000 and the PB4000 would have essentially identical measurements.) Just be sure that you compare them in the same one-port mode that I did. The real strength of the ported Ultra subwoofers is in their low-frequency extension and SPL. As noted in my reply to the first poster, though, the settings available to you in both your AVR and in the subs themselves will be entirely a matter of user preference. If you want to control the loudness, or the amount of low-bass, when the kids are asleep, there are mechanisms in your AVR for doing that.