CHR70x example projects (lots of pictures, not much text)

[planet10]

April 4 Edit: Was "December/Holiday Sales Special / CHR70.2eN", but that is lomg gone. Some good content thou, so i'll rename the thread.

CHR70.2eN in silver (aka grey) or champagne (aka gold)

dave

 

[planet10]

CHR-Ken

A set of "green" CHR-Ken playing at 7th annual VI diyFEST,

Some comments (most of these are in the CHR-70 applications thread -- a ton of designs for CHR): Nanook (and more comments in the next couple pages), TheSeeker (& here), speakrsrfun (& here ... CHR-Ken is 9 litres), Doorman

dave

 

[planet10]

A list of some applications. Already mentioned http://www.diyaudio.com/forums/full-range/141496-mark-audio-chr-70-application-thread.html

CHR-Ken (dMar-Ken70)
Lotus, double horn loaded reflex (single & double driver versions)
Maeshowe, rear mouth horn
PensilR70, damped coupler
mMarS
microTowers, small ML-TL, in single, double, and single-folded versions
HT appendix to the microTowers with sealed enclosures to flesh out a Home Theatre
Wessex, medium ML-TL for 2 drivers
Mercia, large ML-TL for 2 drivers
Frugel-Horn Mk3
A variety of small bass reflexes

Construction Plans List | Markaudio
P10-hifi Mark Audio Box Plan Library
Woden Design

dave

 

[planet10]

Some pictures of member's CHR70 builds

CHR in 7 litre slot loaded cabinet (FR125 box)

Triffid

Henkjan miniMonitors

Steve's Lotus^2 (more comments, Ian444 build)

Harebrained Double Reflex

tresch's Bass Reflex

planet10 microTowers

Voldemar1 DBR (plans)

Toretta TQWT

joern's 8L BR

An externally hosted image should be here but it was not working when we last tested it.

preiter 5.5L sealed

tresch sealed

Steve's folded halfTower

pytha2008 Black Beauty

An externally hosted image should be here but it was not working when we last tested it.

Alan's Meashowe (more comments)

 

[Tea-Bag]

Dave, love the pics of course, I assume the top one is your pad. An army of speakers.

Can you comment on the CHR-70 'house sound' compared to the other Mark Audio drivers? Do they sound similar, or totally different?

This is quite a great price for an enabled pair of drivers BTW.

 

[doorman]

Dave, love the pics of course, I assume the top one is your pad. An army of speakers.

Can you comment on the CHR-70 'house sound' compared to the other Mark Audio drivers? Do they sound similar, or totally different?

This is quite a great price for an enabled pair of drivers BTW.

I can't comment on the sounds of it's stablemates, but for the price of the eNA chr-70's, I'd grab a pair while I could!
Best, Don

 

[planet10]

Can you comment on the CHR-70 'house sound' compared to the other Mark Audio drivers? Do they sound similar, or totally different?

CHR70 sonics are clearly of the same family as the other metal cone drivers. Not quite as refined or finessed, but with better bass cpabilities and more robust (the pluses & minuses are mirrors of the choices that were made to keep the price down).

The paper cone drivers (EL70, and a prototype A6p), are further away but still of the same family.

dave

 

[planet10]

CHR70 also works in Frugel-Horn Mk3 (seem here with removable baffle and Alpair7)

dave

 

[clk230]

would these drivers work in the curvy changs ,i love the look of the changs if not i'll build the lotus(1 driver).

 

[chrisb]

would these drivers work in the curvy changs ,i love the look of the changs if not i'll build the lotus(1 driver).

IINM, the original Spawn designs predated our introduction to the earliest of Mark's drivers, and the Chang family ranged from Suzy ( FE103E ) to full-on G Chang and Curvy sibling ( FE207E). Of the enclosure sizes in this series I'd imagine that the Brynn or Gabriel might be most suitable for CHR / CHP70 etc. I've built a couple of pairs of the little single mouth Brynn ( FE127E), and they are an easy build and certainly work, but not without limitations.

Scott can correct me on this, but the above said, there are several more recent full size double mouthed designs that are more precisely tailored to the Mark Audio series of drivers, and of the 2 that I've heard, the Maeshowe would be my suggestion for CHR70. With appropriate adjustment for driver chamber volume, it certainly wails with Fostex FE126E. I haven't heard the Lotus - which I guess you're considering it due to room considerations (front mouth or large BVR termini(?) certainly offer some placement advantages)

 

[zman01]

Half Towers with CHR-70.2 - a decent speaker for tight spaces (<5" depth) and listening at moderate SPLs. Easy to build, and a good choice for smaller rooms or as HT fronts. CHR-70.2 bass is surprising, and very clear mid and top. I am playing this with a T-amp.

 

[doorman]

Good looking job, Zia!
I agree that the chr-70's bass output came as a surprise to me, though I've not heard 'em in your particular cabs.
Best,
don

 

[zman01]

Don,

Thank you for the kind words. I have the CHR-Kens (as you have) and in my experience the half Towers go slightly lower and have a bit more grunt. CHR-Kens disappear better, and probably have slightly better finesse in bass.

-Zia

 

[plund]

Dave, In Skeeter's "Super Pensil 12" thread, you have indicated you are working on drawings for dedicated center speaker use. I am interested in that symmetrical design and am wondering if you have a guesstimate of when your plans might be available for CHR70. Then, what will be purchase price? Thanks, Pete

 

[planet10]

Dave, In Skeeter's "Super Pensil 12" thread, you have indicated you are working on drawings for dedicated center speaker use. I am interested in that symmetrical design and am wondering if you have a guesstimate of when your plans might be available for CHR70. Then, what will be purchase price? Thanks, Pete

Pete,

Sorry i didn't catch your post sooner.

It wouldn't take long to get a CHR centre together.

As part of the effort to have a centre channel for all the major Frugel-Horn MK3 drivers thus will be released for free as part of the FH Mk3 planset.

dave

 

[planet10]

It wouldn't take long to get a CHR centre together.

Here you go

http://www.diyaudio.com/forums/full...k3-builds-build-questions-59.html#post2910270

dave

 

[chrisb]

Here you go

http://www.diyaudio.com/forums/full...k3-builds-build-questions-59.html#post2910270

dave

Note drawn for 15mm (nominal 5/8") material - as always if using material of different thickness, retain internal dimensions, particularly those of slot ports / internal aperture, and be sure to chamfer/relieve rear side of driver cutout - preferably before assembly.

 

[plund]

Thanks Dave for the CHR drawing and Chris for the CHR build tip! I will slooooowwwly get the FH3 and Center together. Pete

 

[plund]

Dave or Chris,
Question regarding Center speaker...You provided nice drawings for building a center using the CHR70 however, my desire to pinch pennies lost out to my desire to upgrade so I did purchase the A7.3. Are the center dimensions you provided in this thread the same for the A7.3?

Pete

 

[chrisb]

Dave or Chris,
Question regarding Center speaker...You provided nice drawings for building a center using the CHR70 however, my desire to pinch pennies lost out to my desire to upgrade so I did purchase the A7.3. Are the center dimensions you provided in this thread the same for the A7.3?

Pete

First of all, the CHRs are very nice drivers, but you won't regret the upgrade


Secondly, the 7.3 driver is larger diameter, particularly if you use the extra ring, and the machining will get a little tight if you want to rebate for flush mount and allow for grilles. ( I know, a bit of a hobby horse of mine, but high on the list of my WAF is that all speakers must have grille covers)

I'm not sure if Dave has posted the drawings for the Alpair7 dMar-Ken7a Centre, or if it's part of a subscription plan set.(my copy is dated Mar 1/2011, so it could be obsolete anyway) The format is the same as for the CHR, but the dimensions are different - so I wouldn't start making sawdust 'til you confirm that.