MarkAudio CHP-90 Enclosure Options

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#261
Nice that that the microphone issue was fixed!
Scrolling back through the thread, it looks like the box for the CHP-90 is 14L with a 1.8cm x 21cm slot/port that has a port length of 13cm?

If so, winISD gives me a a rather peaky alignment with a 2.5dB hump at ~83 Hz, an F6 of around 55 Hz, F10 of around 48. This could explain the unsatisfactory sound. See if your measurements confirm!

Changing the port width from 21cm to 13 cm may give a more satisfying alignment. Box tuned to 54Hz, No peak, F6 at 48 Hz, F10 at 41.5 Hz


winISD.png



The bluebluck is way different alignment. Very roughly entering in the dimensions in Hornresp and making some assumptions gives me a general ballpark response that looks like:
bluebuck.png


From my sim, it looks like it's tuned to something on the order of ~42Hz; resulting in F6 ~37Hz, F10 ~32Hz,

Really nice looking alignment with a lot of bass extension (at the cost is cone excursion, limiting max SPL). For someone interested acoustic and Jazz, it looks like a winner!
 
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#262
birkie said:
Nice that that the microphone issue was fixed!
Scrolling back through the thread, it looks like the box for the CHP-90 is 14L with a 1.8cm x 21cm slot/port that has a port length of 13cm?

If so, winISD gives me a a rather peaky alignment with a 2.5dB hump at ~83 Hz, an F6 of around 55 Hz, F10 of around 48. This could explain the unsatisfactory sound. See if your measurements confirm!

Changing the port width from 21cm to 13 cm may give a more satisfying alignment. Box tuned to 54Hz, No peak, F6 at 48 Hz, F10 at 41.5 Hz


View attachment 1120491


The bluebluck is way different alignment. Very roughly entering in the dimensions in Hornresp and making some assumptions gives me a general ballpark response that looks like:
View attachment 1120498

From my sim, it looks like it's tuned to something on the order of ~42Hz; resulting in F6 ~37Hz, F10 ~32Hz,

Really nice looking alignment with a lot of bass extension (at the cost is cone excursion, limiting max SPL). For someone interested acoustic and Jazz, it looks like a winner!
Click to expand...
birkie said:
Nice that that the microphone issue was fixed!
Scrolling back through the thread, it looks like the box for the CHP-90 is 14L with a 1.8cm x 21cm slot/port that has a port length of 13cm?

If so, winISD gives me a a rather peaky alignment with a 2.5dB hump at ~83 Hz, an F6 of around 55 Hz, F10 of around 48. This could explain the unsatisfactory sound. See if your measurements confirm!

Changing the port width from 21cm to 13 cm may give a more satisfying alignment. Box tuned to 54Hz, No peak, F6 at 48 Hz, F10 at 41.5 Hz


View attachment 1120491


The bluebluck is way different alignment. Very roughly entering in the dimensions in Hornresp and making some assumptions gives me a general ballpark response that looks like:
View attachment 1120498

From my sim, it looks like it's tuned to something on the order of ~42Hz; resulting in F6 ~37Hz, F10 ~32Hz,

Really nice looking alignment with a lot of bass extension (at the cost is cone excursion, limiting max SPL). For someone interested acoustic and Jazz, it looks like a winner!
Click to expand...
Not a bad conclusion. Scott (who designed them for MA), wrote in an answer to me that Fb is 40Hz, F6 34 Hz. I've specified the 18mm MDF and ordered. Hopefully building will commence over Xmas, assuming no hold ups.
 
#263
hmj said:
Not true. A friend bought a pair of Maop 11 from Soundimports and although stipulated as matched, they weren't according to him. I said to sent them back but he said its not worth it.
Click to expand...
Well mine are matched.
I am satisfied.
What was wrong with Alpair 11Maop?

Here are parameters:
MAOP10.2 260A
FS 43.70
VAS 18.9370
QMS 1.6972
QES 0.447
QTS 0.3538
SD 90cm2
CMS 1.6772
MMS 7,556 g
RMS 1.2506 WM
RAT 74193 WA
RMT 5.9990 WM
MMD 7.0734 g
h0 0.36%
L.1kHz 1.2949 mH
L10kHz 0.0961 mH
RE 7.2000 ohm

MAOP10.2 260B
FS 43.44
VAS 18.7973
QMS 1.6583
QES 0.4458
QTS 0.3514
SD 90 cm2
CMS 1.6649
MMS 7.8030 g
RMS 1.3270 WM
RAT 77456 WA
RMT 6.2628 WM
MMD 7.3204 g
h0 0.35%
L1kHz 1.2588 mH
L10kHz 0.0989 mH
RE 7.2000 ohm
 
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#267
LeifB60 said:
Well mine are matched.
I am satisfied.
What was wrong with Alpair 11Maop?

Here are parameters:
MAOP10.2 260A
FS 43.70
VAS 18.9370
QMS 1.6972
QES 0.447
QTS 0.3538
SD 90cm2
CMS 1.6772
MMS 7,556 g
RMS 1.2506 WM
RAT 74193 WA
RMT 5.9990 WM
MMD 7.0734 g
h0 0.36%
L.1kHz 1.2949 mH
L10kHz 0.0961 mH
RE 7.2000 ohm

MAOP10.2 260B
FS 43.44
VAS 18.7973
QMS 1.6583
QES 0.4458
QTS 0.3514
SD 90 cm2
CMS 1.6649
MMS 7.8030 g
RMS 1.3270 WM
RAT 77456 WA
RMT 6.2628 WM
MMD 7.3204 g
h0 0.35%
L1kHz 1.2588 mH
L10kHz 0.0989 mH
RE 7.2000 ohm
Click to expand...
Received them unmatched. Obviously not the same guy. He is not a member here.
 
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#269
A mismatch would necessarily affect two pairs, so presumably that's the 2nd. Let's hope so anyway. 😉

The drivers are all numbered. Binding the individual boxes together might be possible, but many down the supply chain don't like it for logistical reasons -pallet space / dimensions / stacking can end up being a factor for example; ditto for shelf-storage at a warehouse for example. Sounds silly, but I've been there, & it can crop up. Ultimately though, if a pair of these drivers is sent out mismatched on the serials, that's a dealer / seller error. We're all of us human so I'm not suggesting 'blame', head-rolling or anything of that nature -especially since the buyer didn't consider returning them to be worth it, and since nobody else appears to have had this issue, it evidently isn't widespread.
 
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#271
Hi everyone! Some good news! It looks like there was some setting in the Audio Card interface of the PC probably limiting the band not only for the MIC but also for the speakers!!! I've made different test changing few parameters here and there in the interface and wow!!! it seems that the bass is back and not bad at all now!!! both from the the CHP-90 and the W5-2143! Really unbelievable!!!
Will post of course some other news soon and absolutely new correct measurements are needed!
 
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#279
LeifB60 said:
Maybe someone can tell me what they sound like?
First time building MLTL. What can I expect?
Click to expand...

Like any speaker it depends on the room, speaker specs, etc., but in general like a bigger/'fatter' speaker than it is, ergo a bit more life-like due to greater acoustic damping to the point where with the high Vas 12 - 15" drivers some believed there either was an extra driver hidden away or complex labyrinth BLH loading to account for its 'heart attack fast' transients, 'full' bottom end that we perceive as also having a wider HF BW than in reality (folks perceiving it having top end air (> 16 kHz) with a horn that's ~ -10 dB/10 kHz, -18 dB/20 kHz!) or due to some of 'you know who' tricks, i.e. massive power/EQ to frequency shape its response to anything but flat.

That said, drivers designed for minimal box size generally don't do well unless heavily damped IME and why I assume the pioneer's tower/column speakers AKA 'Pencil' cabs nowadays have proven so popular.
 
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#280
Quickly assembled BlueBuck.
Listened to some songs now.
Kudos to Scottmoose.
Now I have received bass from the CHP-90. Didn't think they would give so deep and so good bass. Yes, it is enough.
The middle register and the treble sound as before. Maybe there is more emotion in the voices. Straighter frequency curve may be the answer to this.
Thanks for your good design.

GM, yes they sound bigger than they are.
More fun to listen to when they give voices a more live feeling.
 
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