Borg,
An amp with a 600 ohm input is designed to be used with a preamp with a transformer output (like professional gear in the old days). Without a matching transformer-output linestage, you can have severe problems with bass response. The amp was probably designed to be used with a specific linestage because transformer coupled gear is not that common these days.
An amp with a 600 ohm input is designed to be used with a preamp with a transformer output (like professional gear in the old days). Without a matching transformer-output linestage, you can have severe problems with bass response. The amp was probably designed to be used with a specific linestage because transformer coupled gear is not that common these days.