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Acoustat Spectra 1100 10 ohm resister
Acoustat Spectra 1100 10 ohm resister
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Old 18th June 2019, 01:59 PM   #1
lewisgarnet is offline lewisgarnet  Canada
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Default Acoustat Spectra 1100 10 ohm resister

Can anyone tell me if the 10 ohm resistor in parallel with the ESL input needs to be so high a wattage (I think some one said 40 watts). I have matched non-inductive 16 watt resistors I want to use if I can

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Old 18th June 2019, 07:46 PM   #2
bentoronto is offline bentoronto  Canada
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Acoustat Spectra 1100 10 ohm resister
Do you sometimes play sine test tones?

B.
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Old 18th June 2019, 10:02 PM   #3
lewisgarnet is offline lewisgarnet  Canada
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Not sin test tones - a bit of Euro Techno. You mean I can use the 16 watt.

Garnet
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Old 18th June 2019, 10:14 PM   #4
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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Quote:
Originally Posted by lewisgarnet View Post
Can anyone tell me if the 10 ohm resistor in parallel with the ESL input needs to be so high a wattage (I think some one said 40 watts). I have matched non-inductive 16 watt resistors I want to use if I can

My opinion is that 16 watts is far too small in wattage. The original resistor is 50 watts (if I remember correctly) and even that resistor sometimes cooks when the speaker is driven very hard. I recommend a minimum of 50 watts in this application: the best reliability would be to use a metal-bodied resistor mounted to the metal chassis (I did this in my own pair of 1100s). I also question if there would be any sonic value to using a non-inductive resistor in this application.
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Old 18th June 2019, 10:15 PM   #5
bentoronto is offline bentoronto  Canada
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Acoustat Spectra 1100 10 ohm resister
Quote:
Originally Posted by lewisgarnet View Post
Not sin test tones - a bit of Euro Techno. You mean I can use the 16 watt.
You've provided meaningful information. But I don't know enough of the circuit to help you more myself.

B.
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Old 18th June 2019, 10:31 PM   #6
lewisgarnet is offline lewisgarnet  Canada
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Thanks, I'll look for Dale's with heat sinks. I use non inductive and matched in everything, pre-amps, amps and speakers (I may be mad, but it's a lovely hobby).
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Old 18th June 2019, 10:33 PM   #7
rayma is offline rayma  United States
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Originally Posted by AcoustatAnswerMan View Post
I also question if there would be any sonic value to using a non-inductive resistor in this application.
If non-inductive, the resistor can do double duty by suppressing HF resonances
due to the speaker wires. There is usually no cost penalty for non-inductive versions.
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Old 19th June 2019, 12:32 AM   #8
lewisgarnet is offline lewisgarnet  Canada
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just looked at the 1100 board again - I think the Colber CW20E wirewound is non-inductive I'm sure that it's the original (20 watt). If they measure close enough I'll leave them for now.
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Old 19th June 2019, 02:34 AM   #9
rayma is offline rayma  United States
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Originally Posted by lewisgarnet View Post
just looked at the 1100 board again - I think the Colber CW20E wirewound is non-inductive I'm sure that it's the original (20 watt). If they measure close enough I'll leave them for now.
An average amp output of 20W is awfully loud into most speakers (but no test tones).

Last edited by rayma; 19th June 2019 at 02:40 AM.
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