I have two AH! tjoeb '99's and the CD-1 replaced one of those in my reference system. There are several improvements going to the nOrh.
For one thing the AH!'s have a bumped up midrange at the expense of the highest highs. The frequency response of the cd-1 is very flat and detailed. The soundstage of the AH! was in front of the speakers while the soundstage of the CD-1 is even with or behind the speakers.
The AH! suffered some muddying of complicated passages due to a cheap transport causing jitter IMHO. The CD-1 has a much higher quality build than the AH! and I have noticed no problems. It is very musical and I couldn't be happier.
For one thing the AH!'s have a bumped up midrange at the expense of the highest highs. The frequency response of the cd-1 is very flat and detailed. The soundstage of the AH! was in front of the speakers while the soundstage of the CD-1 is even with or behind the speakers.
The AH! suffered some muddying of complicated passages due to a cheap transport causing jitter IMHO. The CD-1 has a much higher quality build than the AH! and I have noticed no problems. It is very musical and I couldn't be happier.