2. amps-preamps
  3. 129295-13625

What amp do you use with your passive pre?

I decided to get a LDR Passive Pre. No, not Tortuga. This one is from a super nice guy name Chris in New Zealand. I currently have a Class D amp (one of those better boards). Although I like it, I always miss the Class A/tube sound. So, looking for amp that is minimum 50wpc. I currently have 91db speakers but will change them soon to Harbeth (most likely).

Long story short; what amp are you using with your passive pre?
celo
celo OP
158 posts
 
However, what I just wrote above is different than this. The specs below is from Nelson Pass First Watt J2.

Output power in 8 and 4 ohms respectively.
30 watts @ 1% THD, 1KHz
15 watts @ 1% THD, 1 KHz

Input Sensitivity 280 mV = 1 watt, 1.4 V = rated power

According to what I wrote above,
280mV x 30 watts should be 8400mV but this is 1.4V at rated power.
georgehifi's avatar
georgehifi
10,312 posts
 
OK let me try to clarify few things in my mind.
I assume every amplifier manufacturer gives the input sensitivity
I’ve only ever seen the input sensitivity (in volts or millivolts) for amps as stated for the amps full wattage output just before clipping. Unless specifically stated for only 1 watt of output

Speakers sensitivity (where you maybe getting confused) is stated as sensitivity in dB for for 1watt input .

Cheers George
celo OP
158 posts
 
@georgehifi no not confused with dB. 

So, unless stated like First Watt J2, it is always stated at full power?
georgehifi's avatar
georgehifi
10,312 posts
 
Yes with poweramps, input sensitivity is usually stated as the maximum voltage input, at which time the amp is just below going into hard clipping usually into an 8ohms load.

Cheers George
kalali's avatar
kalali
1,977 posts
 
The wording is usually something like "at rated full power". You could directly drive most of the amplifiers in the market with a 3 volt output from your DAC.
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