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Author Topic: Hafler circuit used in SDA Crossover  (Read 13502 times)

Offline GraphicFX

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Hafler circuit used in SDA Crossover
« on: August 01, 2014, 02:00:48 AM »
Ismy Hafler info similar to the SDA info from my polk SDA's

Since My recent Polk SDA discovery, I've wondered if the L-R / R-L surround info is what is being used in Polks SDA design.
Since I've been running these speakers, I've found no reason to switch on my surround amp. until yesterday. The Hafler circuit seemed to produce the same musical info as what was coming from my mains. So Identical, that there wasn't much of a change between using the surround and not.

What gives..

I'm expecting to hear from you F1 nut on this one. 
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Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

Offline F1nut

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Re: Hafler circuit used in SDA Crossover
« Reply #1 on: August 01, 2014, 02:15:58 AM »
What do you mean, "surround info"?
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Offline GraphicFX

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Re: Hafler circuit used in SDA Crossover
« Reply #2 on: August 01, 2014, 08:27:04 AM »
Quote from: F1nut on August 01, 2014, 02:15:58 AM
What do you mean, "surround info"?

I have surround channels which use a hafler circuit.  My question is the following:
does polk use some sort of version of the Hafler Circuit via the IC and the SDA drivers?
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Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

Offline AdamG

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Re: Hafler circuit used in SDA Crossover
« Reply #3 on: August 01, 2014, 08:57:41 AM »
It's not exactly a Hafler circuit, but it is a very similar concept. From what I remember, the SDA effect is the inverse of the opposite channel, and only a limited bandwidth of it as well. I'm not positive on that, as it's just from memory on when I was studying up on the pair I had.
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Offline F1nut

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Re: Hafler circuit used in SDA Crossover
« Reply #4 on: August 01, 2014, 11:57:04 AM »
Quote from: GraphicFX on August 01, 2014, 08:27:04 AM
I have surround channels which use a hafler circuit.  My question is the following:
does polk use some sort of version of the Hafler Circuit via the IC and the SDA drivers?

No, SDA's passive technology addresses the interaural crosstalk problem inherent with stereo sound reproduction. It is not an effect.
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Offline GraphicFX

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Re: Hafler circuit used in SDA Crossover
« Reply #5 on: August 01, 2014, 01:17:25 PM »
Quote from: F1nut on August 01, 2014, 11:57:04 AM

No, SDA's passive technology addresses the interaural crosstalk problem inherent with stereo sound reproduction. It is not an effect.

Quit busting my balls
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Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

Offline F1nut

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Re: Hafler circuit used in SDA Crossover
« Reply #6 on: August 01, 2014, 05:23:21 PM »
I wasn't.
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Offline Sir Thrift-a-Lot

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Re: Hafler circuit used in SDA Crossover
« Reply #7 on: August 01, 2014, 05:40:58 PM »
Quote from: F1nut on August 01, 2014, 11:57:04 AM
Quote from: GraphicFX on August 01, 2014, 08:27:04 AM
I have surround channels which use a hafler circuit.  My question is the following:
does polk use some sort of version of the Hafler Circuit via the IC and the SDA drivers?

No, SDA's passive technology addresses the interaural crosstalk problem inherent with stereo sound reproduction. It is not an effect.

What does that mean?
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Offline GraphicFX

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Re: Hafler circuit used in SDA Crossover
« Reply #8 on: August 01, 2014, 06:14:46 PM »
Quote from: F1nut on August 01, 2014, 05:23:21 PM
I wasn't.

I know u weren't  I was just busting Your balls
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Main system
Pre-amp: Adcom GTP-350
Main Amplification: Crown PS-400
Surround Amplification: Crown PS-400
Mains: Polk SDA-2B Studio
Rear fill: Polk RTA-12
Subs: (3) Velodyne F1200b

Offline F1nut

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Re: Hafler circuit used in SDA Crossover
« Reply #9 on: August 01, 2014, 09:26:50 PM »
Quote from: Sir Thrift-a-Lot on August 01, 2014, 05:40:58 PM
What does that mean?

It means that if anything is an effect it is conventional stereo reproduction as it is inherently flawed.
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Offline F1nut

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Re: Hafler circuit used in SDA Crossover
« Reply #10 on: August 01, 2014, 09:27:43 PM »
Quote from: GraphicFX on August 01, 2014, 06:14:46 PM

I know u weren't  I was just busting Your balls

Got me.....LOL
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Offline Sir Thrift-a-Lot

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Re: Hafler circuit used in SDA Crossover
« Reply #11 on: August 01, 2014, 09:57:23 PM »
Quote from: F1nut on August 01, 2014, 09:26:50 PM
Quote from: Sir Thrift-a-Lot on August 01, 2014, 05:40:58 PM
What does that mean?

It means that if anything is an effect it is conventional stereo reproduction as it is inherently flawed.

This sounds like double talk to me.   What does that circuit do that isn't an effect?
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Offline F1nut

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Re: Hafler circuit used in SDA Crossover
« Reply #12 on: August 01, 2014, 11:10:01 PM »
I already answered that one, "addresses the interaural crosstalk problem inherent with stereo sound reproduction."
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Offline Sir Thrift-a-Lot

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Re: Hafler circuit used in SDA Crossover
« Reply #13 on: August 01, 2014, 11:50:56 PM »
How does it address it?
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Offline F1nut

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Re: Hafler circuit used in SDA Crossover
« Reply #14 on: August 02, 2014, 01:50:55 AM »
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