When less then 10 cm away from any (!) tweeter I have, I hear noise from it even when the signal to a normal fully integrated amplifier is perfectly zero (short circuit).
The only time I do not hear this is when I connect the loudspeaker to a pure power amplifier and putting its volume attenuator to maximum volume. In this case there is no resistor devider in the soundpath.
What the hell is this, and why should I put up with it?
The only time I do not hear this is when I connect the loudspeaker to a pure power amplifier and putting its volume attenuator to maximum volume. In this case there is no resistor devider in the soundpath.
What the hell is this, and why should I put up with it?
awboy said:
You really should describe the "noise" in more detail; it could be several things that would each sound different. Without any other description, I will take a guess and say the noise is from DC offset present at your speaker terminals. Try putting a large cap in series with the tweeter and see if that cures it.
Since the tweeter already has a capacitor in series with it what effect would adding another one have?
Richard C said:
I had assumed he was talking about connecting the tweeter directly to the terminals.
The simple answer is noise is always dominated by that
produced in the preamplifier for any power amplifier with
a remotely respectable noise figure.
This is completely unavoidable.
🙂 sreten.
produced in the preamplifier for any power amplifier with
a remotely respectable noise figure.
This is completely unavoidable.
🙂 sreten.
Timn8ter said:
No of course it isn't, unless you want misleading
results, especially for moving magnet RIAA inputs.
😉 sreten.
awboy said:
Johnson noise aka thermal noise, because you can't eliminate it without dropping the temperature to absolute zero.
The following will make it more aparant:
1. Sensitive speakers
2. Circuits with higher resistances
3. Preamplifiers with gain.
Re: Re: Do tweeters always noise?
Yes Drew, I do mean that I hear an almost white nois source, and not dc klicking or such (leadbelly).
Say that the source is (high) resistor Johnson noise, then buffering the input before the resistor (volume knob) should help, n'est ce pas?
Yes Drew, I do mean that I hear an almost white nois source, and not dc klicking or such (leadbelly).
Say that the source is (high) resistor Johnson noise, then buffering the input before the resistor (volume knob) should help, n'est ce pas?
Drew Eckhardt said:
Re: Re: Re: Do tweeters always noise?
You could probably buffer the input with an op-amp and then use a lower resistance (5K instead of 50K) attenuator.
awboy said:
You could probably buffer the input with an op-amp and then use a lower resistance (5K instead of 50K) attenuator.
I agree with Ricahard C!
All my speakers are connected directly to individual power amps (three way active) except the tweets which go via a 70uf cap for protection agaisnt turn on thumps. The all emit small amounts of hum/hiss/buzz, but who cares its to quiet at listening position to hear. Most amps you will find emit noise you can hear if u press your ear to the tweeter, dont worry about it. Unless of course you can hear it at listening position and its very loud, ie masks detail in music. If you can just about make out that the noise is there if u concentrate for it then dont bother either. Its not worth it.
All my speakers are connected directly to individual power amps (three way active) except the tweets which go via a 70uf cap for protection agaisnt turn on thumps. The all emit small amounts of hum/hiss/buzz, but who cares its to quiet at listening position to hear. Most amps you will find emit noise you can hear if u press your ear to the tweeter, dont worry about it. Unless of course you can hear it at listening position and its very loud, ie masks detail in music. If you can just about make out that the noise is there if u concentrate for it then dont bother either. Its not worth it.
Noise is just one of those things that you have to put up with, like mosquitoes. However, different electronic designs make different amounts of noise. There are numerous ways to make a circuit less noisy, but we'll have to drag you over into Pass Labs, Solid State, or Tubes to get you started on making new electronics. Tubes, in general, will have higher levels of noise than solid state, but there are ways of reducing it to very low levels, even so. The best tube gear is nearly inaudible. The best solid state is inaudible.
It's not the fault of the speakers. It's the fault of the electronics. Don't blame the speakers.
Grey
It's not the fault of the speakers. It's the fault of the electronics. Don't blame the speakers.
Grey
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