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Old 12th September 2014, 11:30 PM   #1
greg7 is offline greg7  United States
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Default Secondary Voltage Question

Does the secondary voltage have a major influence on sound quality on the LM1875 and LM3875? I'm using 18V now and I'm curious about 15V. My speakers are highish impedance, however (average of around 12 ohms). Searching this forum and the internet in general hasn't helped much
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Old 13th September 2014, 01:19 AM   #2
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the less the supply voltage, the less the output voltage can be of the chipamp.
less voltage you got on the output, the less it takes to get clipping.
driving a high impedance requires higher output voltage, and therefore higher supply voltage.
so i would say going down to 15 volts from 18 is not a good idea.
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Old 13th September 2014, 01:43 AM   #3
greg7 is offline greg7  United States
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Quote:
Originally Posted by Arty View Post
the less the supply voltage, the less the output voltage can be of the chipamp.
less voltage you got on the output, the less it takes to get clipping.
driving a high impedance requires higher output voltage, and therefore higher supply voltage.
so i would say going down to 15 volts from 18 is not a good idea.
That was my thought. I've read a few comments about lower supply voltages sounding "softer" (which is something I'm always looking for) but those statements are generally qualified by stating speakers impedances more in the 4-8 ohm range
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Old 13th September 2014, 01:46 AM   #4
AJT is offline AJT  Philippines
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i doubt that 3 volts will make a difference....
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Old 13th September 2014, 01:53 AM   #5
sreten is offline sreten  United Kingdom
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Hi, None at all, in your particular case, rgds, sreten.
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Old 13th September 2014, 05:29 PM   #6
JMFahey is offline JMFahey  Argentina
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Agree.
You will have a little less available power, nothing too important acoustically, hard to notice unless you drive your system into clipping such as home DJ on a Saturday night party, but on normal Music enjoying, no big deal.

And no, it won't go "softer" or "harder".
It's a very transparent amp, will faithfully reproduce whatever you throw at it.
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Old 13th September 2014, 05:36 PM   #7
Mooly is offline Mooly  United Kingdom
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This post,
Really basic question...

would help you put numbers in and see what kind of difference you could expect.

Tonality shouldn't change as long as you are well below any clipping point.
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