Audiophilepure

https://www.enjoythemusic.com/diy/0415/Bottlehead_Quicksand_Battery_Powered_Amplifier_Kit.htm

This has been a tough review to write and I’ve taken my time doing so. Bottlehead’s Quicksand is a unique product, superior to the low-end pre-manufactured Class D amplifiers I’ve worked with, but not competitive with (much more expensive) amplifiers that it was compared to. For a beginning DIYer, it’s a great amp, with good clarity, dynamics, and smooth sound, and an easy build. This amp is perfect for a higher-end portable setup, or for use with desktop speakers, or any time when low power requirements are needed and portability is important. There is plenty of room for modification, and I could see some users bringing up the quality level with tweaks to the headphone output configuration, power supply, and possible swapping out the input caps (though the compact size of the stock caps is helpful to keep noise down, on a Class D board). At the price point, the Quicksand is a good value, and is a very stylish way to run a portable or other system. The ratings below are on an absolute scale, so please remember that they are in the context of a very inexpensive amplifier as compared to cost-no-object designs.