zonomorph said:
Steve, which subs specifically are you talking about when you say you can get better SQ for $200 above his budget?
Earthquake MKV-15. Much better mid-bass response, no port noise, will NOT bottom out, just as accurate otherwise. And of course more SPL.
Now here is the LONG answer about SQ:
I've owned a few sealed subs in my day, and the MKV-15 equals them in SQ (most recently owned a ACI Force). I've have always had a problem with ported subs, and I've owned quite a few, including an earlier version of the PB12, and the VTF3 MK2 among others. When played loud, port noise has always bothered me for action flicks. Of course people just say, get more of them so you don't have to push it to its limits. Problem is I don't want to have to have a bunch of subs eating up floor space. Besides that, I can tell when a ported sub is playing on certain kick drum tracks compared to sealed or PR designs. I've done a little blind testing with some sealed designs (Force) and some Hsu and SVS models in particular, and on some tracks I could always tell when the ported subs were playing even at moderate levels. Of course on many music tracks the port "sound" was not noticable at all, but with good solid kick drums for someone who has been listening to music critically most of their life, it's pretty easy to hear the difference. That said some probably don't notice a difference at all or maybe even prefer that sound, and that's cool. I don't however, and that's why I probably will never own a ported sub again.
Different strokes for different folkes as in almost everything!
Now the MKV-15 is not a sealed design, but it does not have any ports either, and it sounds much better for music to me. Someone else on this forum mentioned he sold a MKV-15 for a DD-15, and now kinda wishes he did not sell it. With the advent of the SMS-1 he thinks it is on par with the DD-15 for music. Another guy on AVS said it sounds just as good as the DD-18 and the ML Descent. Yet another member on AVS says the MKV-15 sounds better for music than his Ultra (owns both), mostly because of the better Mid-bass response, though he also said it is "tighter" overall. Also, check this post where I mention someone else who sold their ACI Maestro for a MKV-15:
http://forums.audioholics.com/forums/showpost.php?p=169575&postcount=10
Some people say that the MKV-15 has high THD at the very lower freq. (below 20Hz). They should take the Klippel THD sensitivity test and see at what level they actually can hear THD. The vast majority are in the -12 to -18dB range, which means most people can't even hear the effects of THD with REAL program material (not test tones) until it reaches around 13-26% (even then it's questionable). Sure servo controlled subs like the DD series have lower THD, but can you actually hear the difference? Having heard them IMO, no. At least a couple others I know of that have actually heard the DD series and the MKV-15 agree. For one thing most bass in music is above 25Hz anyway. And at that freq. and above the MKV-15 is just as "clean". Not to mention, the MKV-15 will play louder as well at all freq. If people actually think they can hear say 20% THD at 15Hz in a real movie being played at over 100dB with a LOT of other different bass frequencies being played at the same time, they have another thing coming. Not to mention most subs can't even play that loud that low. The MKV-15 can play down to 10Hz (so what if it has high THD, how many subs are even going to make a "peep" down that low and it's all just for extra effects anyway) and believe me, you will notice the difference between it and other subs when playing movies like BHD, etc. (so I guess in this way you will notice a difference because other subs won't even produce much down this low compared to the MKV-15) I have played a 10Hz tone above 100dB through the MKV-15 and I hardly hear anything at all (ie: can't hear things like things rattling or tones that are a result from THD say at 20, 30, 40Hz etc.. But guess what? I FEEL it.
And no matter how loud I play it with any sources, it never even sounds like it's going to "bottom-out", and never any port noise.
The MKV-15 has the advantages of the ported design in being able to play louder, the advantages of better SQ like the sealed design (IMHO as stated above), along with it's own PR (passive radiator) advantage of being able to do it all in a much smaller enclosure than either the ported design or sealed design (about 17" cubed for the Poly version).
If you have further questions just send a PM. I do not want to side track this thread any further, maybe I just should have kept my mouth shut anyway. Just seems to ruffle some peoples feathers when you compare subs, regardless if it's based on experience or not.
Steve