SVS 25-31PC+ Question....

steveinaz

If you use the "line out" jack on the sub amp to send the signal filtered of bass information for your large mains, what is the cut-off point for the bass frequencies? Here's what I want to try:

Stereo preamp to svs amp line in
line out on svs amp to stereo amp

What settings do I need to change on the svs amp to accomadate this setup? I'm just curious to see how the system would sound running my large mains minus bass information...

tryrrthg

I think Tom V told me it was a fixed 80hz on the high pass filter.

gatemplin

From what I understand the line out is for daisy chaining subs and the crossover does not affect this. I could be wrong though. You could try it and measure the frequecy response to know exactly what is happening or send Tom or Ron and e-mail.

steveinaz

So would you "disable" the XO knob settings with the disable switch?

Sami

Originally posted by steveinaz
So would you "disable" the XO knob settings with the disable switch?

Yes, you should if you can set the crossover from receiver.

Sami

This is a quote from Ron's (SVS) post regarding SW setup in http://www.hometheaterforum.com/htforum/showthread.php?s=&threadid=198145

"
1.) Subwoofer’s Crossover knob is “Disabled”.

2.) Receiver’s setup menu has ALL speakers set to “Small”. Crossover to 80Hz if adjustable.

3.) Look to see (some do some don’t) if your receiver has an option for sending “LFE to Mains + Sub”. You do NOT want this. LFE to Sub only.

4.) See if your receiver has a “LFE Trim” or anything else that might be a “peak limiter”. Turn it off or to its highest (lease effective) level. Turn off “Midnight Mode” or “Compression” (it will have one, they are called different things).

5.) Look at ALL the menu options of your DVD player. Your digital audio output MUST be set to “BITSTREAM”, not “PCM”. Make sure you don’t have any dynamic range compression switched on in the player.

6.) Try another location for the sub. Subs are very VERY placement dependent. You could be sitting in a spot where you are getting lots and I mean LOTS of cancellation.

7.) Make sure you are using ONLY “Dolby Digital” as your playback mode for now. No “THX Movie Mode” or similar “sound field processing” scheme.

9.) AFTER all the above is checked (only change one thing at a time unless you find something clearly wrong) try adjusting phase in one hash mark increments. Usually phase has little effect unless you are running your mains as large, or have another subwoofer.

10.) Give the sub some time, mostly for your ears to adjust. If you didn’t have a sub you are perhaps still getting used to how it should sound (if nothing is wrong with setup). And don’t forget sound can change WILDLY depending on the source you are playing. Do not hesitate to vary the subwoofer level control. It should be up around ½ to 1/3 of its range, the receiver’s subwoofer level control should be about in its first 1/3 of ITS range. Beg, borrow or steal Avia and recalibrate (DVE is questionable and receiver test tones frequently aren’t much better). Finally, look over this page for something else I might have
missed:

http://www.svsubwoofers.com/faq.htm#meter"

steveinaz

Cool..thank you for the help!

tryrrthg

Steve you're using you sub for two channel only, correct? if so then if you hook the sub up they way you want to in your original post, your mains will see everything from 80hz on up (gradually rolling off from 80hz and below). You'll need to ramp up the low pass crossover from where you have it now, not disable it.

steveinaz

OK, still debating if i want to hassle with this "experiment."

Sami

Originally posted by steveinaz
OK, still debating if i want to hassle with this "experiment."

Yes, you do.

It definately is worth it. You can slowly tweak the system, listen with time and decide what setup sounds best for you.

steveinaz

Well, I'm just not too keen on running my beautifully "pure" preamp signal thru a sub amp and back to my power amp.

If I get extremely bored I will try this, just to satisfy my curiousity.

Airplay355

c'mon man, have a sense of audio adventure

Airplay355

oops double post...