Originally Posted by Unclemeaty

Woops, I just looked at the hertz HDP on their site. Sorry but its a Class-D amp. It may work for you but you may have a lot of harshness in the upper frequencies due to the over-all maturity of Class-D amps. If you want a Class-D amp for mids and highs, try ZedAudio as they are the absolute pioneers.

Contracry to what I said before, Hertz HDP amps are probably better for mids and lows and probably not high frequency. If you want a 'Hertz' amp that works very well for highs, look at their Audison line, or look at a Class-AB line from Hertz.