PDA

View Full Version : Which sub for my system?


JohnGalt
December 9th, 2007, 3:38 PM
Having recently upgraded my entire HT system I'm down to the final piece: the sub. The remainder of the audio side consists of a Yamaha RX-V3800, a pair of Axiom M80 V2s, a pair of Axiom QS8 surrounds, and an Axiom VP 150 center. My use consists of a roughly 50/50 breakdown between 2-channel music and movies and I'm *very* happy with the performance of this system so far.

The M80s feature a 3dB bandwidth that extends to 34Hz and come in at -9dB at 25 Hz. I set the Yamaha's parametric EQs to boost bass by 4.5dB @ 20Hz with a fairly narrow notch and the result is a very balanced sound with the M80s proving themselves more than capable of providing a very clean and clear sound not only at levels at which I don't want to listen but at levels that can be downright painful to experience. To me the headroom was worth the price of admission as the system never sounds strained under even the loudest reasonable listening levels.

The only criticism I have is that bass-heavy effects in movies and passages in some music lack just a bit of the intensity that I'd like to hear. My best guess other than the extension of the M80s into the lowest octave is that the Yamaha might be having trouble delivering the current to drive the 4 Ohm M80s and the three other 6 Ohm speakers during the loudest low frequency passages. Adding a good quality sub seems to me to be the best way to alleviate those issues.

The room is approximately 27x16x8 but features an 8' opening on one side wall into another room/hallway of equal or slightly greater volume. Front corner placement isn't possible but rear corner placement might be and just-behind-the-couch definitely is (the couch is 2/3 of the way between the front and back walls).

I'm primarily interested in a sub that can keep pace with the M80s at high volume levels in order to take the low-end load off the Yamaha. Clean and tight sound is the order of the day, I'll be hugely disappointed with a sub that's even modestly boomy or sloppy. I'm willing to spend a bit more than is absolutely necessary in order to preserve some headroom as I'll be moving next year and may potentially have a larger HT room than I do now.

I'm down to three contenders: the Axiom EP 600, the SVS PB 13 Ultra, and the Hsu VTF-3 HO w/Turbo. Thoughts, comments, or alternative suggestions would be more than welcome from any and all here. Are these too much for my system? Not enough for the room volume given the adjoining area? Anyone? Bueller? Bueller? Bueller? ;)

Thanks!

Pete_Hsu
December 10th, 2007, 12:36 PM
Hi John,

How about a VTF-3 Mk3 + MBM-12 system? That would be my preference for the given price point. Note that the -3 Mk3 is on sale too.

Sincerely,

JohnGalt
December 11th, 2007, 3:37 PM
Pete - Many thanks for the reply. I'm curious as to why you'd prefer the Mk3 to the HO and why without the turbo?

I'm also a bit unsure as to the recommendation of the MBM as my mains are very linear to 60 Hz and taper down in a very even manner below that. I don't really have a perceived or measured weakness in the 50-150 Hz range so wouldn't the MBM just be redundant for me?

Pete_Hsu
December 11th, 2007, 4:04 PM
Hey John,

I would prefer the HO to the Mk3 in a system used with MBM-12 + Turbo. I suppose if your budget is not too tight up to about $1500, then that would be a dynamite combo. Note that I generally only recommend turbo when using MBM-12 in the system so that one doesn't sacrifice maximum output capability and dynamic range.

The advantage of MBM compared to main speakers handling mid-bass is that you can place the unit in the nearfield for maximum impact, lowest distortion, and reduced room reflections.

Of course, as an alternative, one can always use their main speakers to handle mid-bass, and use a single true subwoofer to handle 50Hz and below.

Considering that your overall room volume is quite huge, you may want to consider dual VTF-3 Mk3. A single -3 Mk3 or -3 HO is best in rooms up to about 6000 ft^3.