Salon2 or 201/2 with dual Funk Audio 18.0 TSAD

[AcuDefTechGuy]

Yeah, I've played w/ 40Hz, 60Hz, & 80Hz. They all just sounded best @ 80Hz.

Going above 80Hz makes me "nervous".

I'm thinking, "might as well buy bookshelfs" if I'm crossing @ 120Hz.

But I realize we have to use whatever sounds the best to us.

 

[Irvrobinson]

Yeah, I've played w/ 40Hz, 60Hz, & 80Hz. They all just sounded best @ 80Hz.

Going above 80Hz makes me "nervous".

I'm thinking, "might as well buy bookshelfs" if I'm crossing @ 120Hz.

But I realize we have to use whatever sounds the best to us.

How are you crossing over? Are you running the mains full range (as I am now), or are you using a high-pass filter for the mains?

As I've mentioned, I only switched to 120Hz to fill a suck-out in the 100-200Hz octave. Otherwise I probably would have stuck with my lower (40Hz, 6db/octave) low-pass setting.

 

[ratso]

irv, how important is the slope? you don't get to choose with AVR's.

 

[Irvrobinson]

irv, how important is the slope? you don't get to choose with AVR's.

You can pick the slope with the sub. The slope is very important. For example, if you use a 6db/octave slope at 120Hz, the sub's response will only be 6db down at 240Hz, which will be quite audible in that frequency range, and still audible in the next octave (from 240-480Hz). The half power point will be at 180Hz. Use a 12db/octave slope for the low-pass filter and you will still have substantial contribution from the sub at 180Hz, but much reduced output by 240Hz. You can use these various slopes to let the sub fill-in upper bass suck-outs in the room response if necessary, but if your room is flat at those frequencies you might want to use a very steep slope, like 18 db/octave.

 

[AcuDefTechGuy]

How are you crossing over? Are you running the mains full range (as I am now), or are you using a high-pass filter for the mains?

As I've mentioned, I only switched to 120Hz to fill a suck-out in the 100-200Hz octave. Otherwise I probably would have stuck with my lower (40Hz, 6db/octave) low-pass setting.

I think I set my Denon to large, XO @ 80hz.

 

[Irvrobinson]

I think I set my Denon to large, XO @ 80hz.

This is one reason why I don't like AVRs and prefer separates. I like more control over the low-pass filter characteristics (and high-pass too, if I use it). Those "large" and "small" designations are just too crude for serious systems, IMHO.

 

[AcuDefTechGuy]

This is one reason why I don't like AVRs and prefer separates.

The Denon AVP-A1HDCI is a $7500 separate pre-pro.

 

[GranteedEV]

You can pick the slope with the sub. The slope is very important. For example, if you use a 6db/octave slope at 120Hz, the sub's response will only be 6db down at 240Hz, which will be quite audible in that frequency range, and still audible in the next octave (from 240-480Hz). The half power point will be at 180Hz. Use a 12db/octave slope for the low-pass filter and you will still have substantial contribution from the sub at 180Hz, but much reduced output by 240Hz. You can use these various slopes to let the sub fill-in upper bass suck-outs in the room response if necessary, but if your room is flat at those frequencies you might want to use a very steep slope, like 18 db/octave.

A few things these electronic slopes don't acount for are the natural rolloff of the driver (pretty significant for most high-mass, highish inductance subwoofers) and even the off-axis rolloff of a larger 18" or 21" driver into midrange frequencies.

 

[Irvrobinson]

The Denon AVP-A1HDCI is a $7500 separate pre-pro.

Yeah, that still has that silly "small" and "large" nonsense.

 

[Irvrobinson]

A few things these electronic slopes don't acount for are the natural rolloff of the driver (pretty significant for most high-mass, highish inductance subwoofers) and even the off-axis rolloff of a larger 18" or 21" driver into midrange frequencies.

True, but I did an in-room test of just the sub and it measures surprisingly flat to over 200Hz. I think it is possible my second-order 120Hz filter set-up is causing some lower-midrange coloration, but if it is that coloration is quite pleasing.

 

[DS-21]

This is one reason why I don't like AVRs and prefer separates. I like more control over the low-pass filter characteristics (and high-pass too, if I use it). Those "large" and "small" designations are just too crude for serious systems, IMHO.

Huh? "Large" just means "mains full range," whereas "small" just means "mains highpassed."

I think it is possible my second-order 120Hz filter set-up is causing some lower-midrange coloration,

Doubtful. In that range, all that's probably happening is that you're getting smoother response due to multiple sources in different places playing in the modal region.

 

[Irvrobinson]

Huh? "Large" just means "mains full range," whereas "small" just means "mains highpassed."

I know. I just dislike the terminology and inconsistency of application details.

. In that range, all that's probably happening is that you're getting smoother response due to multiple sources in different places playing in the modal region.

That's what I think I'm hearing. I just said it was possible I'm getting some coloration. I've experimented with so many different configurations in the past several months I'm to the point where I can only gauge improvement by listening to my own live recordings.