Mark Audio CHR-70 Application Thread - Page 34 - diyAudio
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Old 4th February 2010, 09:08 AM   #331
snooze1 is offline snooze1  Germany
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Hello,
I plan to build a MMAR for Markaudio CHR-70.
The box is indeed closed. I need a blocking circuit to adjust the Lausprecher or does it not?
Have summaryplot frequency response and efficiency of the box? What must be insulated?
The box stands on the desk near the wall.

Michael
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Old 4th February 2010, 11:00 AM   #332
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Where you will be placing the loudspeaker you probably do not need a filter. Simulated FR is attached. Efficiency is the same as specification for the CHR-70 at 84.5 dB. You can looslry fill the box with polyester wool or line the walls with 1/2" wool or cotton felt.

dave
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File Type: gif mMarS70-FR-sim.gif (14.1 KB, 1077 views)
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Old 4th February 2010, 11:19 AM   #333
snooze1 is offline snooze1  Germany
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Thanks for the Reply.
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Old 4th February 2010, 11:54 AM   #334
snooze1 is offline snooze1  Germany
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@planet10,
is the Alpair 7 better then the chr-70
Fits the Alpair 7in the same mMars as the chr-70.
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Old 4th February 2010, 04:59 PM   #335
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by snooze1 View Post
@planet10,
is the Alpair 7 better then the chr-70
Fits the Alpair 7in the same mMars as the chr-70.

none of us @planet10 have yet to hear the Alpair 7, but even so the question of "better than" will probably be best answered as: "maybe - that can depend on your criteria" (i.e. is it a better match/value for you)

for example, I happen to prefer the paper coned (CSS branded) EL70 over the CHR70 in normalized versions of 2 quite different enclosures with which I've had opportunity to spend much time ( i.e the milli-size series, and the microtower), but as always, YMMV
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Old 4th February 2010, 09:24 PM   #336
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Quote:
Originally Posted by snooze1 View Post
@planet10,
is the Alpair 7 better then the chr-70
Fits the Alpair 7in the same mMars as the chr-70.
The A7 should be better. We haven't had this one yet. One would need to change the rebate & holey brace details but A7 should otherwise drop into the same box to get a mMarS7 (milli-Mark-Sealed-alpair7)

dave
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Old 5th February 2010, 09:33 PM   #337
snooze1 is offline snooze1  Germany
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Quote:
Originally Posted by planet10 View Post
The A7 should be better. We haven't had this one yet. One would need to change the rebate & holey brace details but A7 should otherwise drop into the same box to get a mMarS7 (milli-Mark-Sealed-alpair7)

dave
Do i need a Filter for the mMarS7
It is a Problem if the Housing is only 5 Liters
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Old 5th February 2010, 10:11 PM   #338
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The milliSize sealed enclosures are 5.5 litres and about as small as i'd go.

I see lots of FRs from Germany (i guess mostly from Timmermans) that have filters with more parts than some of my amplifiers, so i'm guessing that is where your question comes from.

I avoid filters as much as possible, and that is where i'd start if i were you. I know the German diy magazines have covered both of these drivers, if you find after you have lived with them for awhile that you feel the need to play, then i'd use those as a starting point.

dave
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Old 7th February 2010, 12:50 AM   #339
preiter is offline preiter  United States
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Not exactly to the milli plans, but they are about 5.5 liters and the backs of the drivers are braced.

Rather than fuss with getting the brace exactly the right height, I left it about 1/16 of an inch short and stuck some duct sealer to the back of the driver before I installed it.

Click the image to open in full size.
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Old 7th February 2010, 02:30 AM   #340
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Those look good. Selaed is pretty versatile in terms aspect. Better than ductseal would be something ridgid. shim of wood. pieces of paper, plastic....

dave
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