CHR-70 (2010 Revision)
The all-new CHR-70 has one of the largest stable excursions in its class, a high total Q and a resonance of 70Hz. It is capable of generating authentic musical pleasure in a wide selection of enclosure designs for custom-build projects. OEM, commercial and media applications can also take advantage of CHR-70's durability, excellent performance and styling.
Available now.
Features
The CHR-70 shares the custom build heritage of Markaudio's high-end Alpair driver family. The CHR-70's cone and cap employ all-new profiles on a new aviation grade aluminium alloy. Used together with Markaudio's coating technology, the CHR-70 delivers one of the best overall performances in its class.
Colours
The CHR-70 has clean styling and a choice of either cool-grey or rich-gold colours. The blend of style and colour choices with class-leading performance and professional design makes the CHR-70 is an excellent lower-cost, high-value audio driver.
Performance
The chassis (frame) is a new one-piece injection moulded unit employing a double polymer mix to deliver the required rigidity without the ringing interference frequencies generated by some pressed metal and die-cast frames.
- Very wide frequency range.
- Large stable Xmax.
- Excellent off-axis performance.
- 100% custom designed and made.
- Available in middle gold and grey colours.
What's New?
Easy Installation
The CHR-70 is supplied with high quality hex drive M4 size black, powder coated wood screws and a 2mm PVA cabinet seal for easy installation.
Multiform Cones and Caps
Metal cones are traditionally made by spinning the metal sheet as the material is pushed on to a former by hand. This can cause unwanted variations in the cone surface. A new 7 stage CNC controlled production process now manages the cutting, forming and shape adjustment for the new multiform CHR70 cones and caps. The driver has a tighter fit of cap to cone and improved smoothness of the it's contours.Revised Spider
A reshaped spider improves LF oscillation and lowers the Fo. The main benefit of the improved spider is in the production tolerance. The old spider was made to a stiffness rating of 1.3/50g @ +/-1.5, which was already better than most commercial drivers. Now they are nade to 1.4/50g @ +/-1.2. All of our spiders can now be much more closely matched. Tests show spiders now being within +/-3Hz Fo of each other.Mounting Holes
Larger mounting holes (now 4.1mm) are suitable for M4 wood screws. The CHR70 are now supplied with black powder-coated M4 Hex wood screws. Once you’ve made the driver cut-out in your cabinet, offer up the driver and use a 4mm drill bit in each hole to mark the centre only. Having marked the drill point, remove the driver and drill with a 2.8mm wood bit for a perfect fit. The supplied seals now have an increased thickness of 2mm.Specifications
FO
68.0Hz
Revc
3.60 Ω
Sd
50.02 cm²
Vas
4.20 litres
Mms
4.68g
Mmd
4.47g
Cms
0.167m M/N
Qes
0.754
Qts
0.547
Qms
1.997
BL
3.092 T-M
Levc
0.24 mH
No
0.169 %
SPL
84.5 dB-1/m²
X-max (1 way)
4.5mm
Power
20 watts nom.
for reference only
Frequency Chart
Impedance Chart
Installation
