Last week I ordered Harman Kardon HK 990. The reason for ordering was to reduce the clutter and better sonic performance. Here are few words I have to say about the unit.
My current setup:
Speaker: Magnepan 1.7
Amp: NAD C272 x 2, Bridged mono for Left and Right, ~400w into 4 ohm.
Pre: NAD C162
Source: Transporter and Pro-Ject Debut III
1) Room correction: It did a nice job and you have an option to apply it to Low, Low+Mid and Low+Mid+High Frequencies. It does its job and as with any room correction it makes it sound a little lean i.e. fixes the room modes.
2) DAC: The DAC on the unit is quite good. But then I am just comparing it to Transporter and my primitive analog source
3) ADC: Couldn't test it
4) Sound: Is pretty good, I felt a slightly better highs compare to NAD
5) Sub-woofer: One of the best sub-woofer integration. If you have Stereo sub, this will integrate it nicely to your setup.
1) Control: It got no juice for Magnepans, it may be fine with other easier speaker but with Magies I have to crank it upto 0db+ (-80db to +10db range) to get to a descent level.
2) Room Correction flexibility: Room correction is not very flexible, like I some times get better result by using a PEQ in my transporter with REW
I want Harman to release a pre-amp of this unit, so that people can use their existing amps and provide PEQ for folks that wants to tweak it. I think they can do PEQ using firmware so we'll see