Originally Posted by basshead81
Agree 100%. I would not choose a sub based on 20hz sine wave wars either.
Originally Posted by basshead81
So are you basing judgement on a graph or what your ears tell you to make the final decision? 7hz extension is meaningless unless you can get enough output down that low. Meaning the lower you go the more output it takes to sound equal to the higher frequencies. Look up the equal loudness curve.
Point is, chase output first, then extension.
I would go with the system that is 115db(reference) capable down to 15hz opposed to the system that is 110-112db capable down to 10hz. The goal should be to get reference level output capability down to at least 15-16hz. This ensures the sub system with cover 90% of source material with clean reference playback capability. If the 3000i will do that and give you some good output into the 10hz range then go that route. If not stick with the V18's.
So let me explain to this those who were thinking I am nuts or that comparing dual V1800s to S1500s is unfair fight.
I recently remodeled my home and part of that was redoing the media room and moving my gear from a rack into a credenza with minor change in layout to accommodate dual subs. I wound up doing upgrades and got an AVR and front 3 speakers in the process as well. Next was the sub. I was a long term happy SVS customer and if the PB-Ultra would have been reasonable prices would have likely just got two of them. In researching alternatives I started reading more on sub design and characteristics as I had always had ported cylinders.
While I was mostly HT vs music I knew I wanted to spend more time appreciating music. I kept reading on sealed vs. ported and all the facts as well as myths. I did read that most people can't tell the difference if subs are well designed and tuned. That being said there was still enough out there about potential benefits on sealed with music. One thing I noticed is that while I love my PC-Ultra as it was far cleaner than my old PC-Plus 20-39 I still felt it was not as tight and crisp as it could be. So I decided I would explore the options. My short list was initially ported HSU, Rythmik and V1500. Then I was thinking sealed and was exploring the F15HP and S1500, but the shorter warranty and Tom's awesome service kept my PSA only. The S3000i was interesting, just did not like the amp on the side as the subs would be close to credenza and a so amp and cables would be visible. If there were a S1800 this decision would have been done a while ago. So the S1500 vs. V1500 was a closer comparison until the V1800 was coming at a great pre-order price.
So then it was a no brainer to pre-order the V1800s. In the meantime Tom being the helpful person he is suggested I try sealing my PC-Ultra and run some tests. In the process I did some REW tests and happened to watch Edge of Tomorrow and notices what that scene did. Initially I thought sealed mighty be viable since it dug deep and sounded fine, until that scene when I realized how much a sealed sub needs to be pushed to dig that deep and comprising distortion in the process. Thus to get there would a pair of S1500s do it? Tom has been great with extensive advice and responding at all sorts of crazy hours.
Ultimately my goal was try to get the best of both worlds; the deep extension, mid bass punch and tightness and musicality of a sealed with the output I need that a ported would give me. Can I get that with dual S1500s, maybe? Can I get everything except the sub 16Hz extension with dual V1800s, most definitely yes. Is the .1% of the movies that may dig down to 10Hz that important, not really, although would be cool to,hear that scene deep and clean. In the end if the V1800s are musically as good as the S1500s then that makes the most sense. While I know I can audition them both (and Tom is not shy about encouraging that) I am trying to avoid costing him return shipping and want to try and get the decision right the first time.
I do want to thank everyone (especially Tom) for their advice and opinions, regardless of how nuts I have seemed at times, as I have found this process extremely educational and eye opening and hope the posts can help others. Tom has provided very detailed explanations for various recommendations in various scenarios again, providing an excellent educational experience.
Again thanks to all.