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Old 28th February 2011, 02:00 AM   #11
frugal-phile(tm)
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You my well find the affect of a notch on your amp worse that the original problem.

Obsessing over the freuancy reponse will get you no-where. On-axis FR only plays a modest role in a speaker system's ability to connect you to the emotion in the music

If you want a small, simple BR for the CHP, the 10 litre is close to as good as it gets (a guess based on my experience, since i've only played with its siblings). Build it, get 500 hrs on the drivers, and then you can worry about filters and such.

For more you could always just build Frugel-Horm Mk3, now known to perform very well with CHP. Or tempt me to do a Mar-Ken for these.

dave
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Old 28th February 2011, 02:09 AM   #12
doorman is offline doorman  Canada
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Quote:
Originally Posted by planet10 View Post
You my well find the affect of a notch on your amp worse that the original problem.

Obsessing over the freuancy reponse will get you no-where. On-axis FR only plays a modest role in a speaker system's ability to connect you to the emotion in the music

If you want a small, simple BR for the CHP, the 10 litre is close to as good as it gets (a guess based on my experience, since i've only played with its siblings). Build it, get 500 hrs on the drivers, and then you can worry about filters and such.

For more you could always just build Frugel-Horm Mk3, now known to perform very well with CHP. Or tempt me to do a Mar-Ken for these.

dave
No, no !!- don't distract him, don't tempt him-- (at least till he comes up with a Mar-Ken for the 10.2's!)
Don
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Old 28th February 2011, 03:10 AM   #13
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(at least till he comes up with a Mar-Ken for the 10.2's!)
That exists... Chris has a pair on his workbench waiting for me to do drivers. I haven't done the trapezoid yet.

dave
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Old 28th February 2011, 03:11 AM   #14
doorman is offline doorman  Canada
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That exists... Chris has a pair on his workbench waiting for me to do drivers. I haven't done the trapezoid yet.

dave
My bad--I meant the trapezoids!
Don
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Old 28th February 2011, 08:47 AM   #15
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Hello,

I found comments in different DIY Audio threads indicating CHP70 = EL70.
So, is it true one can use EL70 enclosure designs to fit CHP70, or what mods would be needed ?

Thanks
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Old 28th February 2011, 08:58 AM   #16
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I'm just starting to explore the CHP. It has certainly some commonality with EL70, but they are not the same (EL70 for instance has a double stack of magnets)

dave
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Old 28th February 2011, 09:14 AM   #17
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OK, Dave.

If I compare each of these drivers characteristics, the main difference I find is VAS = 6.1 for EL70 and 5.5 for CHP, the other ones are really close.

Considering the Mar-Kel 70, can I built it the same dimensions or add a little in order to tweak it?

Sure the damping will have to be adapted, and I will provide my experience when these box will be built, but I wouldn't start it the wrong direction.
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Old 28th February 2011, 10:03 AM   #18
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I will be doing a version of the Mar-Kel70 for the CHP. And that will be adapted for the CHP70.3 when it comes out

dave
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Old 28th February 2011, 12:12 PM   #19
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Quote:
Originally Posted by planet10 View Post
You my well find the affect of a notch on your amp worse that the original problem.
Obsessing over the freuancy reponse will get you no-where. On-axis FR only plays a modest role in a speaker system's ability to connect you to the emotion in the music
If you want a small, simple BR for the CHP, the 10 litre is close to as good as it gets (a guess based on my experience, since i've only played with its siblings). Build it, get 500 hrs on the drivers, and then you can worry about filters and such.
For more you could always just build Frugel-Horm Mk3, now known to perform very well with CHP. Or tempt me to do a Mar-Ken for these.
dave
I will of course try with the raw driver first, I guess in the 10l BR.

But I learned the hard way that the Fostex 103e had a strong benefit with a BSC + Zobel in a BR enclosure. The treble curve + effect of voltage source with more than 30 ohm impedance at 20k was a very pronounced high treble near 100 dB/w/m with the rest of the driver around 90 db, and the bass less than that...
Other enclosures I tried were pleasant at first but quite fatiguing in the long term : lumpy TQWT, dead-end frugal horn etc…
Your ears gets easily accostumed to frequency responses...
What you loose in details and subtelty was given back by all frequencies playing music together ; and also better FR curve allowed me to listen longer to the music.
Yes, there is perhaps a little less emotion (but it is still there) but emotion isn't anymore at the detriment of my ears...

So I now don't want to have any prejudice against any options...

it also depends of the quality of your components (cement res. and most caps are bad sounding : for me the answer was Mills resistors and Mundorf bipolar lytics)

eric
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Old 28th February 2011, 05:08 PM   #20
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You don't have a shop that sells plumbing pipe?
A slot port would be easier than gluing blocks and drilling.
dave
A shop near me has tubes that are 40 mm inside, I guess here in France sizes should be globally metric.
A 38 mm diameter and 98 mm long should give 40mm and 110 mm, right ?
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