Second SVS

beardog03

I was thinking of getting another SVS sub...

I can`t really afford the one(s) I really want right now, so I was thinking of getting a CS cylinder and either running it off of the other PC-Ultra, or maybe one of the Rotels (bridged) that I haven`t sold yet...

Waddaya think..?

Schris22

just from what I've heard in history...if you really want it and can't afford it now....but perhaps "soon" (subjective I know), then just wait and get what you really want then having to replace what you are about to get.

Chris

lanion

I think you are insane.

beardog03

I was just wondering if the plus driver and the ultra driver would blend very well..

looking back at my history, you may find that saving money is not one of my forte`s..!!!!

I really want the four driver ultra..!!
no way I can save up for that anytime soon, as I am still on my quest for my Cary :rolleyes:

beardog03

lanion wrote:

I think you are insane.

you are correct sir..!!

VR3

Dont mix the Ultra and +...

Dosnt really matter if it blends or not... its just a different driver...

You wouldnt mix the RTi series with the LSi would ya?

Dr. Spec

While dual Ultra would be ideal, the most important thing is to buy the same size/tune cylinder, since the phase response will be very similar in the 20-39PCi, 20-39PC+, and PCU models. That way you will get reinforcement at all frequencies with the minimum potential for cancellation.

wingnut4772

I just decided to experiment last night and I set up my PC Plus 20-31 with my new PB12 Ultra/2. It smoothed out a little dip in the room some and I think it sounds a bit more integrated. My room is narrow so I have wicked placement restrictions. The Ultra is where the Plus used to be and I placed the plus to the left of the sofa. It sounds pretty decent. I have to say also though that the PB12 by itself sounds incredible and if I wasn't running around with a test cd and an SPL meter lke an obsessive maniac that would be enough.

opus

Dr. Spec wrote:

While dual Ultra would be ideal, the most important thing is to buy the same size/tune cylinder, since the phase response will be very similar in the 20-39PCi, 20-39PC+, and PCU models. That way you will get reinforcement at all frequencies with the minimum potential for cancellation.

Dr. Spec, Am I correct in reading that if a person had two 25-31 pc+ and wanted to run them tuned different, say 1 at 25hz and another at 16hz, that this would be bad. I'm also insane and always thought that someday I would slam another pc+ in the room just for kicks.

BIZILL

opus wrote:

Dr. Spec, Am I correct in reading that if a person had two 25-31 pc+ and wanted to run them tuned different, say 1 at 25hz and another at 16hz, that this would be bad. I'm also insane and always thought that someday I would slam another pc+ in the room just for kicks.

i cannot scientifically tell you why, but it wouldn't make sense to me to do so. just set 'em both at 20 hz. having dual subs in that config would seemingly yield higher spl's in both 16hz and 25hz and actually all other frequencies. but what do i know?

beardog03

Sid,

you have a piont there...


Dr. Spec,

Thank you,
use same size tubes and tuning characteristics to minimize cancelation...got it..!!

Early B.

Do it, Bear, do it. Sell the Rotel to help fund the purchase, whatever it is.

Someday I'll have two, too.

beardog03

I`m thinkin PC-Ultra # Dos

I still need to get the Cary first, but I was cruzin the SVS site (thanks wingnut !) an dstarted thinking about a box sub with two ultra`s in it..

But as DR. Spec pointed out, I should stick with another PC-Ultra..!!

wingnut4772

I have the Ultra tuned at 16 and the Pc is just at its natural 20 and it sounds good to me. If we are not supposed to do that I guess ignorance is bliss. My SPL readings improved too so I don't know what to say.

opus

[QUOTE= if I wasn't running around with a test cd and an SPL meter lke an obsessive maniac that would be enough.[/QUOTE]


Hey Wing, How about sharing a graph with us, if you are truly obsessive that is. Several people have posted their SPL graphs over the months and they are interesting to look at. :cool:

wingnut4772

Do you know where I would get a graph program? I don't have Excel. I just did a little hand drawn dealie.

opus

wingnut4772 wrote:

Do you know where I would get a graph program? I don't have Excel. I just did a little hand drawn dealie.

Shoot me a pm with your non-corrected spl numbers and hz levels and I will make you a computer drawn dealie

BIZILL

i just love "dealies"!!!

wingnut4772

Thanks Opus. Let me find my sheets here somewhere. They're in a notebook type dealie

Dr. Spec

opus wrote:

Dr. Spec, Am I correct in reading that if a person had two 25-31 pc+ and wanted to run them tuned different, say 1 at 25hz and another at 16hz, that this would be bad. I'm also insane and always thought that someday I would slam another pc+ in the room just for kicks.

That is correct. It's not the frequency response so much as the phase response. Unless the phase response is the same for each subwoofer, you can get cancellation at certain frequencies. And since the phase response changes pretty drastically when you alter the tune, both subs should always be run at the same tune point.

wingnut4772

Opus, PM sent. Thanks

opus

Wingnut, With a little help from Mcloki here are the numbers you sent.
These are corrected and graphed thanks to snapbug.
I am a little confused on which sub this is or if it is both. Let us know.

wingnut4772

This is actually the reading from the PB12 Ultra/2 by itself. I have my system set at a crossover of 60? The corrected numbers look a little better, but I still have dippage.

jdhdiggs

wingnut4772 wrote:

The corrected numbers look a little better, but I still have dippage.

Penicillen should clear that up for you....

Actually, try raising the X-over on the SVS a bit and focus on the dip. It may be a phase issue, level matching, or maybe the room. Moving the X-over should help isolate the issue.

wingnut4772

I have the crossver on the actual SVS disabled as my pre/pro handles that. Do you mean to activate it or to raise the pre /pro crossover setting. I took readings while turning the phase knob on the Ultra and I have it where the SPL was highest...and I am allergic to penicillin

dkg999

Dr. Spec - your comments on the phasing of two different subs is interesting. I run an SVS 20-39 PC+ in the front left corner, and an SVS PB10 in the right rear corner of my HT room. I am in an apt. so getting good bass effect without annoying the neighbors is critical. I have found two things with having the dual subs that are of different types. 1) I can fill the room with bass at relatively low SPL's. 2) By adjusting the phase controls I can minimize the bass that starts shaking an rattling things. On #2, an EQ might do the same thing, however by tweaking the phase controls I have been able to accomplish the same thing good enough for an HT in an apt.

jdhdiggs

I would suggest moving it higher on the pre/pro and see if the dip moves.

wingnut4772

No. Dip ain't moving. I am doing another furniture re-arranging and I am going to try and fit it up in the right corner to see.