Rudi skrev:
Det ligger jo en Calypso med skikkelige rør ute tilsalgs for 24k........... er vel egentlig ikke noe og lure på da.
Bryston 4BSST har ganske lav inngangs impedans på den balanserte inngangen - 15K, høyere på den ubalanserte 46K.
For best match bruk en preamp med lav utgangs impedans.
Fra Stereophile sin test av Calypso
The Calypso's output impedance was very different from the balanced and unbalanced outputs, suggesting that the former have an additional buffer stage (though no suitable solid-state devices can be seen on each channel's circuit board).
The balanced output impedance was 112 ohms at 1kHz and above, this increasing to 3900 ohms at 20Hz due to the finite physical size of the output coupling capacitors.
The unbalanced output impedance was a high 2400 ohms at midrange and high frequencies, rising slightly to 3150 ohms at 20Hz. In unbalanced mode, the Calypso will need to be used with a power amplifier offering an input impedance of at least 30k ohms if the bass is not to sound lean.
Pass XP-10 har også en høy utgangs impedans - 2K balansert ut.
Bryston sin egen preamp ca 100 ohm balansert og 50 ohm ubalansert ut.