If I rememeber correctly, it can easily be adjusted internaly. I have vever done it but it seems I recall there being a set of jumpers to change.
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I used to sell audio research and McFavre4, along with having a great member name, is right. The resistors are available from ARC and allow you to pad down the gain. Just give them a call. You can diy it or if you're not comfortable soldering just send it to ARC. A freind has an sp6 connected to an amp with very high input sensitivity and couldn't get the volume past 1 detent without the volume being uncomfortable. After a pad down from a reccomendation by Dave Gordon at ARC, the two worked perfectly, and he was able to use the volume pot well into its range.