Axiom Home Page Forums General Discussion Stereo Stereo amp recommendation?

DE, you may have been making the crossover question unnecessarily complicated and should indeed apply the KISS principle. To me that would suggest that you try the provisions that the SVS has before considering any type of external crossover. Since your 3480's outputs are unfiltered full range, use the sub's internal crossover to set it's rolloff(bearing in mind that, as Tom Nousaine has often found, the markings on the dial may be very inaccurate). Although the details aren't entirely clear(possibly ask Tom at SVS)my understanding is that the line level output on the sub has a 12dB/octave high pass crossover at about 80Hz to the receiver inputs. Feeding this into the amp ins on your 3480(with the jumpers disconnected, of course)might well give entirely satisfactory results without further complication.

The 3480 has a sub out but it is a full range signal.No need to disconnect any jumpers.

John, I thought the Highpass can only be engaged through the high level(speaker terminals) connection??

Wid, I believe John is refering to hooking up RCA from the source(ex: cd player) directly to the sub, then route another pair of RCA from the SUB preout to the 3480's main-in where jumpers connected. Now, instead of using the main-in shouldn't I use CD-IN or any other line level input instead??

Bridgman,

I believe the HK has 2nd order(12dB/octave), either that or 3rd order (18dB/octave) but definitely not 4th order.

I will try the 80hz highpass from svs sub and see how the M22ti sound with it. They're running in full range and don't sound strain at high volume so I might ended up leaving them the way they are.

Yes, this is a similar concept that is employed in several other mfg'ers designs as well - most notably Reference 3a.

In reply to:

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That's why the M3Tis sound so good.

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I don't mean to pick nits -- ok, maybe I do -- but wouldn't this mean that the M22s would sound better if configured the same way, with the woofers "running free"?

It seems the Pb-1 does do high pass filtering using the line level connections.I'll be darn.So what it seems Johnk is saying is to disconnect the jumpers on the reciever send the signal from the preouts of the reciever to the inputs on the sub then the outputs of the sub back to the inputs of the amp section.If thats the case thats a pretty nice feature my subs don't have.

Yes, Rick, what I meant was disconnecting the jumper between the 3480 pre-out and main-in so that the high-passed out from the sub would feed the 3480 amp section.

DE, as Rick also commented, SVS says that the line-level out on the sub is high passed, but doesn't give details. I've seen it said elsewhere that it's a 12dB/octave cross at 80Hz, but contact SVS for more info if you want.

I'd sent an email to Erik at SVS and still waiting for reply, I believe the PB1 has a 12dB/octave highpass as well.

The PB1 is on its way from Maryland to Virginia at the moment, and scheduled delivery is tomorrow afternoon...yayyy!! ;-)