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Old 7th February 2009, 01:43 AM   #1
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Default New 4" driver from Markaudio

CHR-70
This year is going to be tough for many folks as the economy struggles. So I've been busy designing and making a new driver to meet the need of builders on a tight budget.

I received many requests in last year to do a lower cost driver that's easy to work with in small to medium sized build projects. I originally thought of adapting one of my existing designs but later decided to start with a clean sheet.

The CHR-70 (70mm cone diameter) is full range (70-20kHz), has a decent Xmax, a high total Q, 100% custom built and I think looks good. It simulates well in most box design software, especially BR and will be interesting to see lots of experimentation in TL.

FO 70.0Hz
Impedance 4.0 ohm
Revc 3.60 ohm
Sd 50 cm
Vas 3.61 litres
Mms 4.80g
Mmd 4.59g
Cms 1.00 m M/N
Qes 0.84
Qts 0.65
Qms 2.82
BL 3.10 T-M
Le-vc 27.44 uH
No 0.16 %
SPL 85.0 dB-1/m
X-max (1 way) 4.5mm
Power 22 watts nom. (40 Max)

We also produced 4 plan guides to help get builders started.

More info on - http://www.markaudio.com/chr70

Have fun and keep smiling!

Cheers,

Mark.

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Old 7th February 2009, 04:04 AM   #2
type is online now type  United States
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4.5mm x-mas - looks like a fun 4 incher. What's the main difference between the copper and silver driver?

I noticed the term "injection molded" - what is the frame made out of?
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Old 7th February 2009, 05:41 AM   #3
_henry_ is offline _henry_  Australia
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how much the price would be?
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Old 7th February 2009, 05:50 AM   #4
_henry_ is offline _henry_  Australia
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Mark, will u be kind enough to answer this

1. Plastic frame? its done before, i used to own a JPWML510i, their woofer using plastic frame also, for the price the speaker is quite nice.

2. the same size as JX92S?

3. But abit high Fs = 70hz.


What would be the applications for this? i mean compare to alpair10 and alpair6?
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Old 7th February 2009, 06:04 AM   #5
_henry_ is offline _henry_  Australia
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good contender for simple Computer Audio 2.1 and 5.1 HT setup also i think.

Do u have any recommended bass or sub driver for them ?
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Old 7th February 2009, 06:38 AM   #6
EUVL is offline EUVL  Europe
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As far as I can tell, the CHR70 is a only touch bigger than the AP6, 50% more power handling, less inductive, somewhat lower in costs. You also suggested BR enclosures for both 6 litre and 11 litre. The latter should give a even lower bass than the AP6 in 6 litre BR.

Would you care to comment on comparison between the CHR70 and the AP6, both technically and sonically ?


Thanks,
Patrick
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Old 7th February 2009, 06:53 AM   #7
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Quote:
Originally posted by _henry_
how much the price would be?
It's easy to miss on his site, but they are $64.99 Grey, $69.99 gold.

Cheers!
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Old 7th February 2009, 07:06 AM   #8
EUVL is offline EUVL  Europe
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per pair !!


Patrick
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Old 7th February 2009, 07:09 AM   #9
gooki is offline gooki  New Zealand
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Was looking to order a pair, but your site doesn't seem to ship to New Zealand or Australia.
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Old 7th February 2009, 07:09 AM   #10
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Hi Henry,
Be glad if you can send me more detail on your JPW's. If you have a close pic of the JPW frame, I can tell you more. Getting lots of emails so need some help.

Frame diameter of the CHR = 124mm. Jordan 92 (from memory = 140mm)

CHR's Fs = 70. I haven't designed the CHR to be an alternative. Size and performance, it's in the same area as the smaller Fostex and W4 Tangbangs, 4" Dayton etc. The CHR is similarly priced to these drivers.

CHR70 would be ideal for BR box sizes from 3 to 7 litres, more depending on what you're trying to achieve.

See the plan build suggestions - http://www.markaudio.com/taxonomy/term/77,84

Hope this helps.

Thx

Mark.
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