So the real question is whether it is the standard amp or if it is high or low gain.
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Options: High gain version (0.5V Input Sensitivity, for use with passive preamps applications) OR Low gain version (1.5V Input Sensitivity at 4W full power - half gain of default /down 6 db, for ultra high efficiency systems such as Avant Garde / Klipsch / TAD ...etc)
Depending on this setting will dictate what preamp you want. If you have the high gain version, you will over-drive the amp unless you have a preamp with no gain. A passive circuit will work or an active circuit that changes the impedance is better. The Art Audio Conductor or Conductor Simply 2 is ideal for this.
At the opposite end, you still are driving this to full volume with 1.5v. Many standard preamps are outputting more than that. The Art Audio DM VPS with has about 8dB of gain is a perfect match for this. You could use either if you are in the middle though I would lean toward the Cconductor Simply.
If you aren't familiar, Art Audio is a UK company that is best know for it's SET amps like the Diavolo and Carissa. They were very popular in the 2000's until the distributor failed rather spectacularly in 2009. They have had representation in a limited way in the US since then until we picked it up in 2019 and are in process of rebuilding the brand in the US. It is well established in Europe.
I am about to relaunch the DM VPS and haven't even loaded it on the website yet. They are designed for matching with SETs so we do not include XLRs. They do have remote volume and it is designed to work with highly sensitive amps. I believe the Simply 2 is $8500 (lacks a headphone amp) and the DM VPS is $8000.