Hi,
I'm currently using a 2 ohms wirewound series resistor connected to the primary of my 1:150 audio step-up transformer for my DIY electrostatic loudspeaker to dampen the LC resonance and keep the load at high frequencies acceptable for my amplifier.
Power handling of this resistor is only seven watts:
RWM06222R00JA15E1 | Vishay RWM 6x22 Series Axial Wirewound Resistor 2Ω +-5% 7W +-75ppm/degC | RS Components
I have another resistor that is 10 Watts, 2.2 Ohms and it has a cement body:
Cement Resistor 10W 5R J 5 Ohm +-5% Precision
Beside power rating, is there a preferable type of resistor for this type of application? (audio)
I'm currently using a 2 ohms wirewound series resistor connected to the primary of my 1:150 audio step-up transformer for my DIY electrostatic loudspeaker to dampen the LC resonance and keep the load at high frequencies acceptable for my amplifier.
Power handling of this resistor is only seven watts:
RWM06222R00JA15E1 | Vishay RWM 6x22 Series Axial Wirewound Resistor 2Ω +-5% 7W +-75ppm/degC | RS Components
I have another resistor that is 10 Watts, 2.2 Ohms and it has a cement body:
Cement Resistor 10W 5R J 5 Ohm +-5% Precision
Beside power rating, is there a preferable type of resistor for this type of application? (audio)
Hi,
A preferable resistor should be :
1) Reducing current flow through transformer's primary so core is not saturated if amplifier has a DC offset
2) Making sure amplifier does not go into clipping because of too low impedance at high frequencies
3) Not introducing excess distortion because of non-linear core magnetization current
Considering point 3) is of interest it's value should be as low as possible to satisfy 1) & 2)
Regards
A preferable resistor should be :
1) Reducing current flow through transformer's primary so core is not saturated if amplifier has a DC offset
2) Making sure amplifier does not go into clipping because of too low impedance at high frequencies
3) Not introducing excess distortion because of non-linear core magnetization current
Considering point 3) is of interest it's value should be as low as possible to satisfy 1) & 2)
Regards
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Depends on whether you are playing music or REW freq sweeps. You'd be surprised how much heat you can put into that resistor during loud sweeps and how little during acoustic-instrument must
.
Once you need a resistor to keep the primary system from becoming unhinged, a big percentage of the amp brute force will end up in the resistor at high frequencies (and possibly low, if you go real low).
The key is to measure, measure, measure along the way and at the end. Even with primitive tools, you can match your resistors (always buy three). And you certainly must measure final results with the speaker playing in your room.
B.
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Once you need a resistor to keep the primary system from becoming unhinged, a big percentage of the amp brute force will end up in the resistor at high frequencies (and possibly low, if you go real low).
The key is to measure, measure, measure along the way and at the end. Even with primitive tools, you can match your resistors (always buy three). And you certainly must measure final results with the speaker playing in your room.
B.
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