Hi all, I got my dual SVS SB-2000's this morning! I started by hooking up one, ran some calibration and tests, then moved on to adding in the second. I will say that the clarity / lack of distortion is night and day compared to my old PSW505 (it would distort and chuff at lower frequencies), although it still doesn't go quite as low as I thought it might have. However, I did notice that when running some sweeps there seems to be a much larger "dead spot" in the frequency spectrum on the SB-2000s than my old polk. I'm hoping you all can help me troubleshoot/understand this a little more. Perhaps its my setup or my room and not these beautiful looking subs?
Setup: Onkyo TX-RZ830 with Polk LSiM 707/706/702. Audyssey EQ after auto setup tried to set all my LSiM crossovers to 40hz, but I manually overrode them all to 80hz. LFE channel in the receiver is set to 120hz LPF, and the SB-2000s themselves were physically dialed to phase 0, volume at ~11o'clock (ended up -2.0db on the receiver with single or -7.5db with both), and crossover set to LFE. Then I turned off my external amp (monolith 7x200) so I could hear just the subs on their own. I did some A/B comparisons with my old Polk PSW505 as well as some single vs dual SB-2000 tests. (really wanted to understand what I was getting with my sub upgrade) I also moved the subs around the room a bit, with minor impact to the concern I'm highlighting below, and when I did the old/new sub compare I used exact same positioning. I used some frequency sweeps from youtube test clips, and also confirmed with some Disney Wow and THX Demo bluray/dvds too. They all were very consistent, below is what I observed...
Polk PSW505 20-120hz sweep:
20-25hz not much output at all
25-33hz some reasonable output but chuffing and distortion heard
33-45hz reasonable output, some boominess though
45-52hz output weakened in this zone, min point around 49 or 50hz
53hz and up back to good output volume levels again
SB-2000 20-120hz sweep:
20-28hz some good clean sound (even tho output/volume is low, definitely can feel some rattles and shakes)
28-44hz this thing really shines, clean bass, good output (tight, not boomy)
45-65hz something weird happens, the output volume falls off very quickly with a minimum around 53 or 54hz, almost to the point of being inaudible, then slowly builds up again 60hz-65hz
70hz+ finally the volume / output seems to be restored and normal in this range
Initially I thought I had a null spot in the room, but moving the sub or the listening position didn't seem to change things much. Adding the 2nd SB-2000 in made the range where this occurred a little smaller (maybe by 1 or 2 hz on each side) but I would say not significantly different. I tried each SB-2000 on its own and both had an almost identical profile, even from the 2 different positions in the room. I put the polk back again and checked it again side by side just to be sure, and it also has a weak spot but its much narrower and at a different frequency center point for the minimum (so I don't think its the room...but I'm pretty new to all this...)
Does this sound like a room issue?
Any chance its a setup issue?
Is this a normal observation with good subwoofers like SVS?
Could it be that this is expected from an SB-2000 and I really need to look at something higher end? (Ex: SB-3000, PSA S1512, HSU ULS-15 MK2)
I can definitely hear/feel the improvement in the <40hz range with the SB-2000s. They don't dig quite as "deep" as I had hoped, but I guess I shouldn't expect miracles from a 12" driver. I'm more concerned about the poor output in the frequency range of 45-65hz, especially if I'm going to consider putting my cross-over for my LSiMs at 60 or 80hz.