Sub location.

McLoki

Ok - I have an SVS 25-31 cs+ on the way to me and a GIANT room to fill with sound.

I currently have two subs (polk audio PSW-350 and a 10" MTX both tuned to 38hz according to their cabinets) I was thinking of starting the SVS sub where the MTX is currently located. Does this sound like a good plan? Should I plan to purchase another 25-31 cs+ when I can or do you think one sub will do it?

Here is a pick of the first floor layout - (TV, LSi7's and LSiC are all on the corner fireplace. (I know stands would be better, but small children prohibit that option.)

If the picture does not post, I will try again when I get home to attach it. (can you not preview pics? )

McLoki

Oh yea - size of room is 25x15 (back of fridge to far wall and sliding glass door to stairs)

Dining room is about 12 x 15

openings to other rooms are about 9 x 7

all have 8' ceilings except 12 x 18 (or so) living room with a vaulted ceiling (about 14')

System used for 90% HT / 10%Music.

Thanks again,

Michael

VR3

Your room isnt as big as my dads room (35x35x9-12) with all openings, etc etc...

He has one PC Ultra and it fills in that room with adequate bass for MUSIC. For HT, it REALLY*** struggles on the low end..

So I recomend you calibrate it to where you get the MOST output at 20hz and below...

My best advice, whether or not u need another one is up to you

Tour2ma

McLoki,
You are in excess of 5500 cu ft... and that's not even counting the upstairs and front formal living areas... which must be considered. Well into PB-2 Ultra territory... Was the SVS 25-31 cs+ an SVS recommendation or your choice?
EDIT#2: Nevermind, I see now it was a used purchase...

I'd at least temporarily try the SVS all alone in the left rear corner formed by the partial wall defining the Dining area. I don't see another corner for you to use.

Try crossing over lower than the standard 80 Hz, maybe 60, maybe a bit lower like 50.

As for the ports, Sid, he may have to go the other way.. open them to get the dB in the 30-ish range. I do agree that this size space is a reach for the 25-31.

If the above approach leaves you wanting more, one other crazy idea occurred to me since you have the other subs.
- Try one in the speaker wire run to the 7's crossed at 80 Hz using the sub's control.
- Use the AVR's x-over set around 40
- plug one port on the SVS...

.. and call me in the morning... or better yet, call Dr. Spec...

EDIT: Oh, and keep the doors to the laundry and bath rooms closed...

McLoki

I e-mailed svs with this letter (I also attached the picture at the top of this thread) - comes down to this - They have AWESOME customer service and in my opinion have gone above and beyond for what I clearly describe is the private purchase of a used subwoofer. Very Impressive :

Hello,

I currently have a 25x15x8 room (3,000 cubic feet). It has 2 openings in the room both about 9' wide by 7' high. The openings are to my living room (15x12 with about 14' ceilings) and my dining room (right behind my viewing area about 15' x 13' x 8').

I currently have my TV and 2 Polk audio LSi7's sitting on top of my corner fireplace (small children make stands not an issue right now) with a center channel on top of the TV. (please see attached drawing)

I currently own a Polk audio PSW-350 10" sub as well as an inexpensive MTX 10" sub. (both subs are tuned to 38hz)

I just purchased a 25-31cs+ sub from a member on the Polk audio forum and was wondering if:
1) based on my room size should I plan to purchase another one from you?
2) would replacing both my subs with it and putting it in the location of my MTX sub be a good starting point?
3) Is this a sub that you would recommend to me or should I sell it and
purchase something else?

Some hopefully helpful facts:
1) I am not overly dissatisfied with the subs that I have but do find them lacking for Home theater. (a little boomy and not very deep bass)
2) I usually listen about 6-10db below reference volume. (90-95db peaks)
3) I sit about 12 feet from both the TV and the sub.
4) I am at my budget now, but would like to know if I should plan to purchase an additional sub, a replacement sub, or what I have is a good starting point.
5) I use the system for 90% home theater.

current equipment.
Onkyo 777 AVR (currently in use as a preamp and running the rear channels)
Cinepro 3k6 mk1 - (500w/channel into 4 ohms - this will run the new sub and front channels)
Polk LSic - center channel
Polk LSi7 - Front channels
Polk rm6600 - rear channels
(all speakers currently set to small)

Thanks for all your help,

Michael

They responded with this:

Mick,

Ouch, that's a big open room. But, simply replacing both those subs with the 25-31 CS+ sub should be a big improvement in depth, clarity and even frequency response. I would take both the old subs out of the loop, put the SVS in either spot, and leave all ports open on the SVS (no plugs).

Later on, if you want more power and depth (and have a spare amp channel still), I would add a second SVS right next to the first, put in one port plug to both subs, and add our cool "SVS Bass Interface Box" off the Parts/Accessories page. I would leave the sub in the most efficient 25Hz extension mode (all ports open) for now though so it's got as much chance as possible to fill that space (setting lower extension modes loses efficiency and loads more stress on the woofer).

Especially if you separate the subs, the fine phase control becomes virtually essential, plus having 18dB of clean gain (the SVS-01 is a little sub pre-amp of its own) and equally important a tailored subsonic filter for 25, 20 or 16Hz means you are going to be able wring every last clean dB out the subs, and your amp.

A pair of CS+ subs, with the SVS-01 in place, will be so far superior to your current setup it'll be difficult to even talk about the two configurations with a straight face.

Like I said, just replacing both with the one CS+ should get you very clean, flat and deep bass without any bloated boominess you might have heard in the past. Often the SVS sound is "dry" at first but once you get used to the accurate sound locked in your disks (currently masked or just plain not produced well) it'll be a revelation I promise.

Let us know who the seller was and we'll make sure you get any remaining warranty too.

Ron

I plan to run the one I am getting as recommended and may add another one if I need to.

It comes down to I am very happy about my purchase. Both of the product and the support I have recieved after the fact from the manufacturer (even though I purchased used).
Excellent job SVS and thank you,

Michael

Tour2ma

Damn, I was actually right about the ports... I need to go buy a couple Lotto tix while I'm hot...

McLoki,

Never talked with Ron, but appears to be another great SVS CS rep in Tom V's mold. Very cool about the warranty transfer to boot.

I need to look at the "cool SVS Bass Interface Box" and see if it stages the two co-located SVS's. If yes, then it may be similar to the idea I put out there on using your Polk as kind of a mid-level sub, holding the SVS in reserve for the deepest material.

Need to get Doc to look in on this as well...

Dr. Spec

He won't want to keep the other subs in the loop after listening to the CS+. Another CS+ and the SVS-01 bass box is the WTG, eventually. Agreed - all ports open will fill the space the best with the loudest bass in the most common bass regions >23 Hz.

McLoki

Dr.

Is it true that the Ultra will not be alot louder than the 25-31cs plus in the >25 hz range. (but will add alot below that)?

I was wondering if I should try and pick up an ultra if I find one for a good price. (and sell the CS+) - Or do you think I will do pretty well with the dual CS+? (will Dual CS+ with one port plugged work better in my space than a single ultra?)

Thanks for your help.

Michael