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My system has some nice (to my ears) pieces of kit in it, including an Audio Note DAC 0.1x, a Croft Micro 25 preamp, a modified Croft Series 7 power amp producing around 90W/channel, and a pair of Russell K Red 150 loudspeakers. In between are a Chord Shawline digital coax cable, some Atlas Navigator interconnects, and some single-wired Atlas Hyper 3.0 speaker cable. At “normal” listening levels, I really enjoy the sound produced – it’s well-timed, neutral, musical, detailed without being too analytical, impactful, full of emotion, rock'n'roll and boogie factor etc. etc. The newly acquired AN DAC has added an extra something and I just sit and listen to the music without pondering whether the source is my Thorens turntable or my Bluesound Vault 2 etc. It’s that good. However, last weekend we had some friends round and I got an opportunity to turn the volume up. What I worked out is that, when playing loud, the sound just isn’t as good. It loses detail and is just a bit less enjoyable. What I’m aware of is that, with an 87db 1 watt 1 Metre sensitivity, my Red 150 speakers aren’t as efficient as some and that, therefore, they might not be the best match for my Croft power amp and vice versa. However, since I spent so much time choosing the Red 150s, and since they sound gorgeous at more relaxed volumes, I’m pondering whether or not the right thing to do would be to change my power amp for something more powerful. The challenges that cross my mind are whether or not the blame does lie with the power amp, and whether or not I’ll be able to find a power amp that’s a good match for my Croft Micro 25. I’m reluctant to consider replacing the Micro 25 because it’s a great sounding pre with a fabulous phono stage and also because it’s been modified to have a mono switch plus a remote control driving a single, motorised volume control. Any advice would be greatly appreciated. For instance, is the Croft Series 7 clipping? Is there anyone who uses a Croft preamp with a non-Croft power amp? Would something like a Chord SPM 1000B 200w power amplifier (there’s one on ebay right now) be a good match? Has anyone gotten a more potent power amp modification from Glenn Croft? Could it be the speakers? Am I expecting too much?