Romandoc is correct. The value of the output coupling cap in tube preamps can significantly increase the output impedance of a tube preamp in the bass frequencies as compared to the rated output impedance at 1 KHZ. The actual output impedance of the Modulus,is probably significantly higher than 1200 ohms at 20 HZ. I would also suggest that the optimal impedance ratio is better at 20:1 or 30:1.
Impedance Mismatch: A.I. M3A, Krell KSA100
I've read opposing views elsewhere on whether there is a sound degrading impedance mismatch between the Audible Illusions M3A preamp, with an output impedance of 1.2 K and the Krell KSA100 power amp, with an input impedance of 22 K.
Something tells me that there is a definitive answer out there.
I own a KSA100 and I'm considering the M3A for use with that amp.
Thanks in advance for any first hand experience or expert advice!
Something tells me that there is a definitive answer out there.
I own a KSA100 and I'm considering the M3A for use with that amp.
Thanks in advance for any first hand experience or expert advice!