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November 12, 2019, 03:30:28 AM

Author Topic: Balanced Speaker Outs for SII  (Read 927 times)

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Offline Paul Birkeland

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Re: Balanced Speaker Outs for SII
« Reply #15 on: February 19, 2019, 01:45:16 PM »
Perhaps you should try a pair of 1K resistors and see what happens.
Paul "PB" Birkeland

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Offline Deke609

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Re: Balanced Speaker Outs for SII
« Reply #16 on: February 20, 2019, 03:39:15 AM »
I was afraid you might say that  :)

Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Tom-s

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Re: Balanced Speaker Outs for SII
« Reply #17 on: May 21, 2019, 09:04:41 PM »
And? How did this experiment turn out? :)

Offline Deke609

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Re: Balanced Speaker Outs for SII
« Reply #18 on: May 22, 2019, 02:17:59 AM »
To my surprise, I noticed no difference between 80 Ohm and 1K Ohm resistors. I was expecting a big jump in volume. I didn't measure voltage at the speaker taps -- just used my ears.

I'm clearly not understanding something basic here.

Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Paul Birkeland

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Re: Balanced Speaker Outs for SII
« Reply #19 on: May 22, 2019, 03:26:28 AM »
I was expecting a big jump in volume.
When you have a reasonably low output impedance, the level will not change much provided the loading impedance is much greater than the output impedance.  If you want to do this experiment and hear a dramatic difference, try 80 ohm resistors and then 1 ohm resistors.  (I don't recommend leaving the 1 ohm resistors though!)
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Deke609

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Re: Balanced Speaker Outs for SII
« Reply #20 on: May 22, 2019, 03:40:23 AM »
When you have a reasonably low output impedance, the level will not change much provided the loading impedance is much greater than the output impedance.

This is what confuses me. With the 80 Ohm resistors, the output impedance of my headphones (200 Ohms) was slightly greater than the load impedance (160 Ohms). So when I switched to 1K Ohm resistors (I think they are actually 1.2K), I figured I'd get a big jump in volume b/c now the load is more than 5X the output impedance.  I assume there was in fact an increase in volume ( I was lazy and didn't do a A/B comparison) but it wasn't nearly as big as I thought it would be. I don't know whether the fact that I tend to listen pretty loud affects things.  I was expecting a jump in the order of a full click on the coarse attenuator or more.
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Deke609

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Re: Balanced Speaker Outs for SII
« Reply #21 on: May 22, 2019, 03:49:42 AM »
Maybe I should try 2K Ohm resistors?
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Paul Birkeland

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Re: Balanced Speaker Outs for SII
« Reply #22 on: May 22, 2019, 03:53:05 AM »
This is what confuses me. With the 80 Ohm resistors, the output impedance of my headphones (200 Ohms)
Headphones are the load impedance.  Output impedance is a characteristic of an amplifier.  The output impedance of the Stereomour on the 8 ohm tap is going to be around 2-3 ohms.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Deke609

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Re: Balanced Speaker Outs for SII
« Reply #23 on: May 22, 2019, 03:55:29 AM »
Aha! Right!  Still don't understand why this is, but now I have a direction for reading up. Many thanks PB.
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4