I just have a 10 year old Yamaha stereo receiver about 100W/channel, don't like the sound, seems harsh. I was using a 250 watt Bryston pro amplifier for a while on the same speakers which are rated 400W and the extra power is noticeable and improves sound quality even at lower volume levels. Extra watt capacity gives "oomph" to any bass drums or other sudden volume increases. A smaller amp just does not have enough extra reserve power to give that sound.
I've been looking at Samson amps. The price is right, about $300 US for 400 watts/channel at 8 ohms, weighs 37 lb. Also Tapco (division of Mackie) has similar amps at slightly higher price, they're heavier, bigger transformers probably. The better amps have a switchable low-cut filter to remove low-end bass like under 30 Hz that just heats up the amp and speakers without producing any useful sound.
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