Re: 1510 -- servo, or not ?
Posted: Fri May 01, 2009 2:45 pm
OK, I will leave the center resistor out as I'm omitting those coupling capacitors.
I have considered both the 1510 and the 1512. After extensive testing I've found that below 40 dB of preamp gain I start to hear the A to D noise of the recording device. This preamp will have fixed gain of 40 dB. If more gain is needed it will be applied in the digital domain. If a signal is too hot, an attenuator will be added between the mic and the preamp input. So the low-gain noise advantage of the 1512 doesn't appeal to me. Comparing the specs at 40 dB, THD+N for the 1510 is 0.0016% for the 1512 and 0.005% for the 1512, while EIN is 1.7 for the 1510 and 1.4 for the 1512, so I'm content with the 1510 and its lower THD+N figure.
My preamp is kind of purpose-built for my use. If I were doing a preamp for commercial release I would build it more conventionally and would basically be duplicating the Rane design. I am loathe to run audio through capacitors when not needed. Last year I tried AC coupling preamp stages and the selection of cap material made a huge difference in the sound.
I have considered both the 1510 and the 1512. After extensive testing I've found that below 40 dB of preamp gain I start to hear the A to D noise of the recording device. This preamp will have fixed gain of 40 dB. If more gain is needed it will be applied in the digital domain. If a signal is too hot, an attenuator will be added between the mic and the preamp input. So the low-gain noise advantage of the 1512 doesn't appeal to me. Comparing the specs at 40 dB, THD+N for the 1510 is 0.0016% for the 1512 and 0.005% for the 1512, while EIN is 1.7 for the 1510 and 1.4 for the 1512, so I'm content with the 1510 and its lower THD+N figure.
My preamp is kind of purpose-built for my use. If I were doing a preamp for commercial release I would build it more conventionally and would basically be duplicating the Rane design. I am loathe to run audio through capacitors when not needed. Last year I tried AC coupling preamp stages and the selection of cap material made a huge difference in the sound.