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you really wouldnt need a SSF with a box tuned that low... not really needed.

Yep, unless I'm crankin tracks on Pink Floyd's "Wish You Were Here" album. I've heard claims of sub 20 Hz material in that bad boy. If you've got that album try "Welcome to the Machine". "Dark Side of the Moon" has some really low stuff as well. Just ask Jonathan. I've heard him describe gettin bass out of his ID Max that is absolutely NOT heard, merely felt.

I just thought of another good reason to figure this out. Have you ever tried to set the gains on a two channel amp that had separate sensitivity pots and were w/o a test CD and a o-scope or rms meter? If you have an amp like that A2002 you could get pretty close to a good right/left balance if you simply matched the resistance on each input. Of course you hope the gains of your output stages are fairly equal as well.

Its probably best to do this by ear, but sometimes thats not possible if you are alone and your amp's in the trunk.

:)

-Fishy

Fishy wrote: Just ask Jonathan. I've heard him describe gettin bass out of his ID Max that is absolutely NOT heard, merely felt.

can be done with any sub that has a reasonable amount of displacement

20hz is normally below what you can hear... although with some people 30hz is below what is audible.

Yeah, I probably don't need a subsonic filter regardless, but I have one anyways with my new deck that'll go down to 16 Hz.

http://www.clarion.com/usa/products/sou ... Z9255.html

-Fishy

Fishy wrote:Yeah, I probably don't need a subsonic filter regardless, but I have one anyways with my new deck that'll go down to 16 Hz.

http://www.clarion.com/usa/products/sou ... Z9255.html

-Fishy

well there ya go :)

Yeah It was more a hypothetical situation.

Before I got that Clarion I had an old Alpine 7831 with 4v preouts, but just about zero features. My 4 channel amp had built in xovers for both its inputs and line outs so I really didn't need anything extra, but ended up installing a PPI frx456 in my center console just for its subsonic filter. I guess it turns out I really didn't need it, but I'm glad I installed the thing anyways. It let me tweak stuff while in the listening position and seemed to improve stereo separation as well. The imaging seemed a lot more detailed after I dropped it in anyways.

-Fishy

Fishy wrote: The imaging seemed a lot more detailed after I dropped it in anyways.

-Fishy

As it should be through a better tweaked setup... or at least i'd hope so!

Having stuff up front is a big benefit too, makes life easier.

I don't think it had much to do with the tweaking as I noticed the difference right away. That xover was top of the line in its day and listed for $400, but still, I'm not sure I understand how things improved so much. Maybe my Xtant's onboard buttterworths were garbage(the PPI has 12 db/oct linkwitz-riley's) or maybe it was simply a placebo effect, hehe.

Even though I shouldn't need it now with the Clarion I think I'll keep it right where it is. Its the older white/art series model and looks really cool. One of the few installs I've done that looks trick. Sure was a big PITA to get it to fit in there nice.



-Fishy

Fishy wrote:I don't think it had much to do with the tweaking as I noticed the difference right away. That xover was top of the line in its day and listed for $400, but still, I'm not sure I understand how things improved so much. Maybe my Xtant's onboard buttterworths were garbage(the PPI has 12 db/oct linkwitz-riley's) or maybe it was simply a placebo effect, hehe.

Either way ]
Even though I shouldn't need it now with the Clarion I think I'll keep it right where it is. Its the older white/art series model and looks really cool. One of the few installs I've done that looks trick. Sure was a big PITA to get it to fit in there nice.



-Fishy[/QUOTE]

pics?

Man I need a digital camera.



This is PPI's present one.

http://www.precisionpower.com/signal/pp_sp_frx456.asp

Its a lil different. Mine's bright white instead of what looks to be a dull grey or silver(to match their PC/DCX amps I guess). It also has an attenuation switch I wish mine had. I'm scared what that Clarion's preouts would do to the thing. I hear the 9255 is capable of 8 volts above the 0 dB volume setting.

Now that I think of it most of you "professionals" have seen it all and probably wouldn't be too impressed with the install. As an amateur I'm very proud of it however, and the guy at Sound Advice did do a double-take when I opened up my center console.



-Fishy