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Old 24th October 2014, 04:20 PM   #1
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Default Are two resistors in parallel better sonically than one?

In several schematics such as the F5 circuits there are two parallel resistors specified instead of one. For example two source resistors of 1 ohm 3 W each resulting in 0.5 ohms 6W. Is this better in some way than using a 0.5ohm 6W single resistor?

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Old 24th October 2014, 05:16 PM   #2
Zen Mod is offline Zen Mod  Serbia
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two of 3W have more body than one of 6W

sometimes that means lesser temp. changes

and just sometimes you'll hear difference , especially when Pa is doing dimensioning of parts
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Old 25th October 2014, 12:49 PM   #3
AndrewT is offline AndrewT  Scotland
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if voltage distortion is a consideration then two series connected resistors can be a benefit.
This advantage does not apply to paralleled resistors.

If power dissipation is a consideration then either paralleled, or series, or series/parallel all benefit equally from the reduced power, after sharing the loading.
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Old 25th October 2014, 01:30 PM   #4
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Resistors are affected by temperature so in a high power position sharing the power, thus reducing heat, might make a difference.
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Old 25th October 2014, 02:52 PM   #5
Dave R is offline Dave R  United States
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Quote:
Originally Posted by nashbap View Post
In several schematics such as the F5 circuits there are two parallel resistors specified instead of one. For example two source resistors of 1 ohm 3 W each resulting in 0.5 ohms 6W. Is this better in some way than using a 0.5ohm 6W single resistor?

Thanks.

Nash
If the resistors are wire-wound type, the combined inductance is reduced in half also. That may affect higher frequencies.
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Old 25th October 2014, 04:11 PM   #6
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Thanks all for the replies. I didn't realize that inductance could also be reduced.

Surely there must be some cons too? Additional solder joints? How well do each of the resistors have to be matched?

Nash
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Old 25th October 2014, 06:46 PM   #7
Dzius is offline Dzius  Poland
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Besides using two or more parallel resistors you can tweek for exact resisitvity easy with.
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Old 25th October 2014, 08:45 PM   #8
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Quote:
Originally Posted by nashbap View Post

...

Surely there must be some cons too?

...
Nash
Cost
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Old 26th October 2014, 10:05 AM   #9
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600mW metal film 1% 100ppm/C cost about 2pence including all UK raxes (~3cents).
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PCB space is an issue.
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