Summary: I'm gonna give it to you straight,because that's how I'd want someone to do me. If you are even considering this amp at all then buy it. If you have heard a slash series amp before then that's all great and stuff but the slash amps don't even compare to the HD series..
Pros: Sonic brilliance! Buy it or regret it! Bring the sounds of Harmon kardon, onkyo, and klipsch to your car!
Cons: A little pricey but all the best stuff is! You get what you pay for really applies here!
Summary: Driving JBL 660gti components (150 rms each continuous, 600 watt peak each) and the sound is absolutely perfect, even at full power with no distortion. Replaced a Polk Audio PA660 and the sound is so clean and balanced now that I was able to completely clear all EQ adjustments (the PA660 required...
Pros: Very easy to install and set via a voltmeter and test tone.
Came with all necessary tools (except voltmeter and test tone).
High power that is very clean and well balanced across the entire range.
Compact and power efficient.
Very robust and accurate built-in crossovers.
JL Audio HD600/4 clean powerful not affect my electrical system in my truck
Tom, Sonic Electronix
6 May 2014
Conclusion: Clean and very powerful amp don't let its small size fool you this thing rocks! Very good in terms of power and clarity and to top it off not adversely affecting my 2011 Toyota's stock electrical system, no dimming lights, monitor voltage and not have any issues, of note also running JL Audio...