Description
The CHR is an affordable all-new Full-Range multi-purpose drive unit suitable for use in variety of medium size loudspeakers applications, or as part of a multiway system. For single full-range point-source purist applications, the CHR90 is highly capable. F Zero is 44Hz, VAS is +26 Litres and SPL 89.4 dB. Useable frequency range (depending on box design) is from 37Hz to 28KHz rated at +86dB. The frequency response curve is near flat, making the CHR90 ideal for purist applications. This speaker driver is very similar to the legendary Alpair 10.3, just a little smaller and much cheaper.
The central mid-range is benign, near flat response, from 1KHz to 6KHz giving end-users and custom builders the potential to use the CHR90 as a mid-field driver in larger multiway applications, useful for balancing out larger radiated surface outputs from big bass units.
The CHR90 also has potential for use in 2 way applications as a bass-mid driver. Most Markaudio drivers have a purpose designed frequency lift in the lower ranges (typically 100Hz to 500Hz) to compensate for baffle step losses. The CHR90 is useful to these applications where end users and loudspeaker makers need a wider choice on frequency cross-over point selection.
The CHR90 chassis is an all-new design, dedicated to this driver. All moving parts (powertrain) are new and custom made for this driver. Much work has been done to make the CHR90 a versatile driver and extend the well-known performance characteristics of Markaudio’s products.
You will find the full data sheet here
You can find a short video of Mark and Stefan discussing this driver over here
FS 44.3 Hz
QMS 2.4647
VAS 26.1403 L
QES 0.4212
dBSPL 89.36
MMS 4.9661 g
RE 6.8000 Ohm
BL 4.7260
QTS 0.3598
SD 0.0085 m2
RMS 0.5614 WM
RES 39.7866 W
MMD 4.5230 g
PWR 40Watts (Nom)
X max 7MM (1 Way)
As usual there are several box plans available, take a look at them below
Classic small vented standmount box
Classic large vented standmount box
Classic slot vented standmount box
Umbriel CHR90 traditional vented box standmount
Mark (verified owner) –
I have just completed a home build with a 14 litre cabinet, ported with 35mm ports and the CHR 90’s supplied by KJF. First impressions are quite simply superb. As I hoped, home building with care and taking your time to research the best materials (in this case, heavily braced 12mm ply, but factoring in the bracing volume first to maintain that 14 litre cabinet volume) seems to have worked wonders. So looking forward to breaking them in properly and just enjoying the life-like reproduction. Many thanks Markaudio and Stefan at KJF.
admin –
Thanks Mark, I think the CHR/P 90 driers are the hidden ge in the Mark audio range of drivers!