Mark Audio CHP-90

I got CHP-90 mica, and the basket is exactly the same as CHR-90.
If they use the same basket, the name CHR-90P is more appropriate than CHP-90.

I am listening to it right away and it sounds great even though it is new.
The CHR-90 was a disappointment, but I hope the CHP-90 will be as good as the MAOP.
 

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I got CHP-90 mica, and the basket is exactly the same as CHR-90.
If they use the same basket, the name CHR-90P is more appropriate than CHP-90.

I am listening to it right away and it sounds great even though it is new.
The CHR-90 was a disappointment, but I hope the CHP-90 will be as good as the MAOP.
The difference is the cone, CHR are metal cones, CHP are paper cones. Yours has mica and glassfiber reinforced paper cones, not a copper-alloy cone like the CHR drivers. The difference in response is that the metal cones have a more bright topend, due to the resonance that is less damped (but still very controlled). The paper cones sound in general more like the oldskool drivers from the 1960's and 1970's while the metal cones have a more modern sound like the legendaric Jordans.
 
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CHP-90 and CHR-90 are the same price.
21,000 Japanese yen (1 pair).

CHP-90 has paper and mica and Kevlar fibers mixed together and has the advantages of both metal and paper cones.
It has a different sound vector from other paper only cones.

By the way, the basket of the CHP-90 I got has CHR-90 stamped on it.
Maybe this driver is a prototype?

CHPor CHR-90.jpg
 
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I like the sound of chp-90.

Note that these are cheaper drivers from MarkAudio, they are not perfect. Build quality seems excellent, on par with my Alpair 10.3, but the my pair of drivers has some lead wire noise(audible when playing pure 40hz tone at ~3mm excursion). I fixed this by applying half drop of 3-in-One motor oil on the lead wires(don't put it close to the cone). After that the driver is completely quiet with the same tone.

The drivers has a quick, light feet sound. I don't like the original Alpair 10p, probably the 500hz distortion peak was the culprit. This time CHP-90 only has minor surround dip at ~1.1khz, probably suggest that the cone is more stiff than the A10p.

My pair was quite matched up to 10khz. Pair matching can't be compared with MarkAudio's metal cone drivers(I have many MarkAudio drivers before. A7m, A10.3, MAOP11, ...). But I admit I don't hear any localization issues.. Thankfully above 10khz there's little real musical information.. only "air".

chp-90.png
 
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I wonder if anything can be done to smooth out the top end ~10dB swings 4-8khz (not DSP). I finally was able to get them in Nov/Dec after inquiring (the CHP-90 had been bunched with the R and unfindable). My impression of brand new drivers was low-ish dynamics which correlated with the ~5khz valley.