grasshpr
100+ Head-Fier
- Joined
- Feb 22, 2003
- Posts
- 497
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Quote:
As for the headphones, I'm not understanding what you are trying to say about dB. Are you assuming your headphones are output devices? Are you mentioning that those values are maximum for the type of voltage levels given? You might want to clarify that in your next response. As for unity gain, it would be appropriate if you source has a high enough voltage range and your amp can supply a sufficient amount of current through to your headphones to reach that range. Depending on the amplifier as well, unity gain amps can cause additional issues with oscillation and instability (but that is subjective to the type of opamp or design that your dealing with).
As for the DACT, I'm assuming your talking about purely the stepped attenuator and not about an amplifier that you may incorporate with this resistor network. I am a little confused about your statement on gain since stepped attenuators are passive devices devoid of gain amplification. You might also want to clarify that statement.
| Originally Posted by Solude Lets put it this way. The Senn 650/AKG 701 put out 105dB@1V or about 90dB@250mV. Now since 90dB is hearing damage and sources put out 2V why would anyone need more than unity gain? Answer, if their source put out a weak output or the source material is recorded well below 0dB. Neither of which are concerns of mine. Notches on a DACT for instance are 2dB in the usable range. A gain of 3x for instance will gain you 4 steps of increased volume while pushing your average listening notch down by 4. At unity gain my average listening step is 11 and on material recorded softly it can climb to 15. At that average level, its pretty loud and I regularily miss my wife talking to me. I still have another 9-13 steps to go before I cap out. Thats another 18dB or 6x gain from normal listening levels to cap. Think another 18dB on top of the 18dB already available is ever going to be needed 
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As for the headphones, I'm not understanding what you are trying to say about dB. Are you assuming your headphones are output devices? Are you mentioning that those values are maximum for the type of voltage levels given? You might want to clarify that in your next response. As for unity gain, it would be appropriate if you source has a high enough voltage range and your amp can supply a sufficient amount of current through to your headphones to reach that range. Depending on the amplifier as well, unity gain amps can cause additional issues with oscillation and instability (but that is subjective to the type of opamp or design that your dealing with).
As for the DACT, I'm assuming your talking about purely the stepped attenuator and not about an amplifier that you may incorporate with this resistor network. I am a little confused about your statement on gain since stepped attenuators are passive devices devoid of gain amplification. You might also want to clarify that statement.
