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Recommendation to build enclosure for Coral Beta 10
Recommendation to build enclosure for Coral Beta 10
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Old 21st June 2021, 01:59 PM   #1
vladov is offline vladov  Slovenia
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Default Recommendation to build enclosure for Coral Beta 10

Greetings.
I have a pair of Coral beta 10. I have a problem with the decision to build BHL original enclosure or to try TQWT box or something on your recommendation
I would like to have good bass as possible, my room is 25m2 and speaker placement is close to the wall.

I am attaching the link of the TQWT case for beta 10 from the German forum.
which I would like try to do
I ask for your opinion and help.

Hifi-Selbstbau - Coral Beta 10B

Best regards.
Miha
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Old 21st June 2021, 03:41 PM   #2
planet10 is offline planet10  Canada
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Recommendation to build enclosure for Coral Beta 10
Quote:
Fs 37.01 Hz
Rdc 7.08 Ohm
Qms 4.724
Qes 0.554
Qts 0.496
Mms 16 g
Vas 195 litre
BL 6.89 N/A
(1m, 2.83V) 94.96 dB
Lost a longish post. I will revisit later.

Neither the horn of the pipe you suggest are worth building IMO so i would forget about them. Why later.

dave
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Old 21st June 2021, 04:34 PM   #3
planet10 is offline planet10  Canada
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Recommendation to build enclosure for Coral Beta 10
1/ Given the age of the driver, one makes a big assumption that yours will be similar. As well, the T/S parameters us amateurs use produce less useful numbers than the factory kit.

2/ The TQWP you pont to is dedsigned using Classic methodology, ithas a vanishingly low chance of being near optimum. If such a box is not mass-loaded (restricted terminus) it can be discarded.

3/ for the same reason, any horn from before 2k is unlikely to be anywhere near optimum either.

Both of these quarter-wave enclosures needs to be specifically modeled for the driver. Perhaps one of our talented/experienced quarter-wave designers will suggest something.

About 150-160 litres sealed gives F10 about 30 Hz anechoic, the box size will be smallish compeared to a Voigt or horn

Going to a 300 litre reflex box that F10 gets near 20, but in room could be just too much.

The size of that vented box should give an idea of the small end of a horn or pipe.

dave
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Old 21st June 2021, 08:01 PM   #4
waxx is offline waxx  Belgium
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I did model a MLTL for it for a friend (who did not build it yet, wood is ridiculous expensive here today due to covid). We did measure his drivers and took the average of both drivers (rather close) as model specs and came to a huge cabinet. 50cm wide, 30cm deep, 160cm height internal size with a 50x6cm slot port on the bottom of 5cm deep. In the modelling stuffing is needed a lot to mask resonances (but hard to model). And this all for an F3 response of 45Hz. Use this info at your own risk, as it's not build or tested yet, and modelled to the specs we had, which may be different than yours (as for the age of the drivers).
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Old 22nd June 2021, 05:22 AM   #5
GM is offline GM  United States
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Back in my pre T/S days my tower designs were based on the classic Vas/1.44, Fb = Fs and damped to 'taste' and it sims the 'toe tapping, finger snapping' performance they were known for [AKA 'the west coast sound' of Altec, JBL] .

Frankly, T/S or not, would still do it today for its superior power handling over larger cabs, especially if tuned lower.
Attached Files
File Type: txt CoralB10clasMTL.txt (1.0 KB, 11 views)
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Old 22nd June 2021, 09:19 PM   #6
Mattes is offline Mattes  Germany
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Hi Miha,


The Coral Beta 10, if still in good shape, is a very good driver and a rare historic item. It deserves every effort to let it shine, but some necessary steps sadly are not that trivial.
First you need to find out if your units are still OK and are still a pair. This is best determined with a TSP measurement, which will also allow simulations of an enclosure afterwards, hoping that your units are still "similar" after all these years...
An easy way to measure TSP is DATS, youll need a non-magnetic clamping device as well.
After these first steps and measurements, we shall see.


Good luck and all the best


Mattes
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Old 23rd June 2021, 06:05 AM   #7
vladov is offline vladov  Slovenia
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Thank you all.
I am aware that they have historical value and that they are worth the effort for the best.
With my little knowledge of speakers it is best to contact an expert.I know a professional who repairs and restores speaker units, he is very good and accurate at his work.
I will ask him to do a test and make measurements.
After review by an expert I will let you know, then I will ask you for guidance.
For now thank you again.
Best regards.
Miha
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Old 23rd June 2021, 08:31 PM   #8
Mattes is offline Mattes  Germany
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Hi Miha,


There has been quite some discussion around the Beta 10 not that long ago on this forum, the search function will get you there.
I myself never had the Beta 10, but had the Beta 8 for quite some time.
I personally think that even today it is quite difficult to surpass these drivers, and if you want to do that, you will pay a lot of money...
Sadly, I ve sold my Beta 8 long ago... what an idiot I was...


All the best


Mattes
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