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Posted on April 5, 2025 at 16:37:47
xaudiomanx
Audiophile

Posts: 3700
Joined: August 16, 2004
 bi-amping or tri-amping their speakers should have a volume pot when making the amp control the speaker properly directly on the mids and highs amp or withing a meter of the amp. I am a firm believer of putting the amp and crossover to the woofers and then bringing the mids and highs amp[(s) introduced and totally controlled by a volume pot.

I let my main speaker run full range(what it's designed for) but my sub amp is on it's own as far as volume is concerned and the mid and high amp[(same amp) is toned down due to the sensitivity of the main speaker and the woofers is different and the amp that pushes the mains and the sub amp has different characteristics.

 

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RE: My view is entirely different ..., posted on April 8, 2025 at 05:23:54
andyr
Manufacturer

Posts: 12654
Location: Melbourne
Joined: September 2, 2000
 You said: 'I let my main speaker run full range (what it's designed for)'.

Whereas I would say ... if you use subs - then you get a better integration by rolling off the mains at a frequency that matches the subs' 'roll-on'.

This is due to several reasons:
1. distortion increases on any 'mains' at their extreme low end.
2. you reduce the load on the amp driving the mains, if you remove the need to deliver extreme LFs ... thus this amp can better service the rest of the frequ range.
3. and you minimise the frequ range where the woofers and subs overlap. (I use 48dB slopes for my woofer/sub XO.)

You also said 'my sub amp is on its own as far as volume is concerned'.

Whereas I would say the one volume control needs to control the volume of both mains and subs.

My miniDSP unit controls volume for all 6 of my power amp channels.

And re. 'the sensitivity of the main speaker and the woofers is different' - the miniDSP unit allows me to compensate for both:
* disparate driver sensitivities
* and different amplifier gains.

Of course, you need to use REW (or something equivalent) to get it sorted!

 

where did you get a, posted on April 8, 2025 at 16:35:08
xaudiomanx
Audiophile

Posts: 3700
Joined: August 16, 2004
 crossover with a 48db slope?

 

RE: where did you get a, posted on April 8, 2025 at 17:48:50
andyr
Manufacturer

Posts: 12654
Location: Melbourne
Joined: September 2, 2000
 48dB L-R is one of the available options in a miniDSP unit.

 

electronic crossover, posted on April 9, 2025 at 19:45:18
Analog Bob
Manufacturer

Posts: 199
Location: Albuquerque, New Mexico
Joined: September 7, 2007
 I am using a Bryston 10B-LR Crossover after my line stage and before my amps.

 

RE: electronic crossover, posted on April 10, 2025 at 05:28:35
Don Reid
Audiophile

Posts: 933
Location: Rural NW Georgia
Joined: February 2, 2001
Contributor
  Since: April 1, 2010
 With my DEQX Pre 8 DSP I don't have to be concerned with primitive devices such as volume pots as I triamplify my DIY speakers.
I dream of an America where a chicken can cross the road without having it's motives questioned.

 

RE: electronic crossover, posted on April 11, 2025 at 14:09:28
Lew
Audiophile

Posts: 11011
Location: Bethesda, Maryland
Joined: December 11, 2000
 Nice, but your audio is converted to digital and back again to analog in the process.

 

RE: My view is entirely different ..., posted on April 13, 2025 at 19:28:30
hahax@verizon.net
Audiophile

Posts: 4511
Location: New Jersey
Joined: March 22, 2006
 I agree. Rolling off the bottom of the main speakers significantly reduces their driver excursion with an obvious increase in transparency and detail(when properly done). And yes I experienced it when I added large woofers below my stand mounts even with a passive crossover.

I understand why generic subs almost never have a high pass filter since the manufacturer doesn't know how to set it for multiple, unknown main speakers. But high end subs with digital crossovers could have software included to create a proper high pass.

If you ever hear it done correctly you'll never go back.

 

RE: But high end subs with digital crossovers could have software included to create a proper high pass ..., posted on April 13, 2025 at 20:38:14
andyr
Manufacturer

Posts: 12654
Location: Melbourne
Joined: September 2, 2000
 Agreed!

But if you're using a digital device ... you should be able to use this to provide the HP filter on the 'mains'. I in fact disable my subs' LP filter and use the miniDSP unit to provide both HP & LP filters for the subs.

And re. "If you ever hear it done correctly, you'll never go back."

Absoloootely! :-))

 

RE: "but your audio is converted to digital and back again to analog in the process" ..., posted on April 13, 2025 at 20:52:10
andyr
Manufacturer

Posts: 12654
Location: Melbourne
Joined: September 2, 2000
 That only applies to vinyl ... all my other sources are already digital!! :-))

Having used analogue XOs for 20 years ... I get significant benefit from the room correction facilities which the miniDSP unit delivers. This outweighs any so-called "degradation" I might have gotten from operating in the digital space.

 

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