Mark Audio CHR-70 Application Thread

[mondogenerator]

Originally Posted by TheSeekerr

Routed, the baffles are, hmm?

looking good master yoda

if i hadnt read the thread title, i wouldve thought these were visatons and not MA drivers....

how much did the drivers cost you? im still trying to find a source in the UK

[TheSeekerr]

I wanted the MkII (2010) drivers, so I bought them direct from Mark Audio - cost me $125AUD shipped, the same as a pair of the 2009 revision from the local distributor.

I don't think there's a UK distributor at the moment, but I believe there's one in Germany which might save a little on shipping

[mes1234]

Hi,
I've got question. Some time ago I bought CHR70 pair. Now it is time to do something with it. I thought about something like vented monitor(7-12l) with extra horn added(1,5m long throat 80mm2 mouth 800mm2). It will look like something at image ( it will be 150mm wide you can imagin it by extrude this profile). My question will this added horn help bass performance. Currently I work at FEM analysis. Image shows wave at 40Hz. I plan to form horn in thin plywood (first mechanical resonance mode is around 118Hz second around 200Hz but the deformation is almost zero so it is rather stiff). Post Your opinion about that idea

[speakrsrfun]

Thanks Dave I'll look thru the thread and see if it helps a brother out. But I already called a few places locally that carry 5/8"(15mm) BB ply and they want $70 per 5x5 sheet, I need to build two cabinets as I have a few CHR-70's hanging around and figure $140 for ply is just a tad too rich for my blood.

Any suggestions for an alternate type of ply anyone, just seems a tad costly to build out of BB at $70/set of cabinets without veneer or finish. Using other building materials I could get 6 sets of cabinets for the same amount invested.

I had my friend look up the cost of BB at his yard and ordered in at "his" cost the ply is $38/sheet ordered in palette form. But he won't order a palette just for me and the two sheets I need LOL, too bad because he would give it to me at cost, $38 is alot easier to swallow than $70. In my 20+ years of lousdpeaker construction I've never used BB Ply, so maybe that's why the cost seems so prohibitive....

Any way I'm going to have these built ASAP, even if I have to do one set in BB ply and the others in MDF...

Take care all...

Originally Posted by planet10

Ontario Canada source for Baltic Birch...?

dave

[GM]

Ideally, weld them up out of 10 ga. cold rolled steel (CRS) or Bamboo ply, but I imagine these aren't an option, so can you get marine grade at a decent price? Not that $70 for 19 mm BB ply is bad, it was ~ $62 at Home Depot/Lowe's around here ~ eight years ago......... Around here, $38 doesn't even buy a decent veneered 3/4" plywood.

Frankly, the last time I browsed Lowe's near me, the butcher block pieced together panels seemed to be at a sufficient quality, 'bang - buck' to warrant trying it out if/when I get to DIY any more box speakers.

GM

[planet10]

Originally Posted by speakrsrfun

...just seems a tad costly to build out of BB at $70/set of cabinets without veneer or finish.

What price quality? We can get enuff free MDF to build these every day. It is well worth spending the money for the BB. $70 per sheet is on the high side of the market.

Check with John, (aka MJLxxxx), he may be able to help

dave

[speakrsrfun]

GM, maybe I should have made the $38/sheet a little more clear. That is a per unit COST wholesale to a lumber yard, but he must purchase a Palette to get this pricing... I'm aware of the cost of ply, too aware, as I spent most of the other night at HD, RONA LOWES and found nothing but utter crap. I like the idea off welded cold rolled cabinets LOL, but I'm getting older and as such would rather not tote 50lb cabinets around .


Thanks Dave, I'll PM him... The BB ply was all 15mm 5x5 cabinet grade (no inclusions). I'd like to start cutting these this weekend if all things go as planned.

[chrisb]

Originally Posted by speakrsrfun

GM, maybe I should have made the $38/sheet a little more clear. That is a per unit COST wholesale to a lumber yard, but he must purchase a Palette to get this pricing... I'm aware of the cost of ply, too aware, as I spent most of the other night at HD, RONA LOWES and found nothing but utter crap. I like the idea off welded cold rolled cabinets LOL, but I'm getting older and as such would rather not tote 50lb cabinets around .


Thanks Dave, I'll PM him... The BB ply was all 15mm 5x5 cabinet grade (no inclusions). I'd like to start cutting these this weekend if all things go as planned.

I've been working for a commercial architectural millwork business for over 17yrs now, and have been enjoying trade / jobber pricing for so long that all retail figures on building supplies seem somewhat usurious.

The above noted price is actually slightly higher than I paid for my last partial lift (13 sheets) of 15mm BB.

If cross country shipping costs on cut parts weren't so high, someone in this position could help a brother out ........

[speakrsrfun]

OK I was able to get some nice B grade 15mm baltic birch for my DMar-ken's which looks fairly good with 11 uniform plys. Going to cut the wood tommorrow if the rain holds off long enough. Have to grab some 3/8" solid wood stock and I'm going to skip brads this round and I'm going to glue and clamp. Might take longer but in the end will require less prep time for final finishing with veneer. So here goes nuttin'....

[italynstylion]

I went to find BB ply locally to me on Friday. $125 per sheet. Hmmm, how 'bout nooo.