I ordered the Alpha One amp for my BMW X3 M40i with Harmon Kardon. The delivery arrived in good condition within the timeframe advised.Unfortunately, the installation instructions I was issued with were for a non Harmon Kardon retrofit and therefore did not make any sense for the kit I had received (hence the reason for 4 stars rather than 5).Fortunately, after contacting the sales support team they identified the problem, issue the correct installation instructions and I was able to undertake the install.The installation was a little bit more complex than I had thought it would be but nonetheless, after about 2 hours (taking my time to get the install right first time) I was rewarded with the clear crisp sound of the Alpha One amp which greatly enhanced the Harmon Kardon system.I would definitely recommend the Alpha One amp, and even with my limited practical technical skills I was able to complete the installation without any issues.
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