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Multi-Way Conventional loudspeakers with crossovers

TQWT Monacor Mindstorm
TQWT Monacor Mindstorm
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Old 30th May 2004, 08:13 PM   #1
weidok is offline weidok  Netherlands
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Default TQWT Monacor Mindstorm

http://baseportal.de/cgi-bin/basepor...&cmd=all&Id=16

Anybody ever built this speaker??
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Old 30th May 2004, 09:25 PM   #2
Tomac is offline Tomac  Croatia
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Hi!
I haven't made this exact speaker ,but I've made TQWT with another Monacor driver - sph 60x.This seems as an interesting project.Both drivers seem to be good for the money.My previos experience with monacor drivers leads to a good opinon about this company. Whatever,I like the sound of my TQWT. Maybe this one could have a deeper bass if made longer,also the roll of at 500Hz could be a baffle step response problem.I think it is becuse I see no BSC circuit included.Make one,you'll have a deeper bass for sure if you add one. I heard that DT-107 is a good tweeter.I encourage you to make this speaker and to inform as on results
Cheers
tomac
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Old 30th May 2004, 10:50 PM   #3
medum is offline medum  Denmark
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Default speaking of Monacor speakers

Has anybody designed TL cabinets for Monacor SPH 135C?
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Old 31st May 2004, 03:54 AM   #4
GM is offline GM  United States
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No, but it's easy enough to do if I have specs.

GM
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Old 31st May 2004, 08:57 AM   #5
medum is offline medum  Denmark
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Quote:
Originally posted by GM
No, but it's easy enough to do if I have specs.

GM

http://www.monacor.com/en/produktsei...nummer=10.2310

Hi GM
I know it should be easy, but I do not have any experience at all about TL-cabinets so far, and I haven' yet found any software, that I could use for TL's. What kind of software do you use?

I believe the Monacor SPH 135 C is a fine little speaker for TL's but please correct me if I'm wrong.

I do not need a very high SPL, and I do have a good sub below 80 Hz.
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Old 31st May 2004, 10:07 AM   #6
Rudolf is offline Rudolf  Germany
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Hi weidok,

the developer of the MINDSTORM is Theo Winterscheidt, the mastermind behind the german loudspeaker DIY forum "www.audiotreff.de". I couldnīt audition this loudspeaker yet, but AFAIK Theo puts his effort into getting max. results from affordable drivers. His TQWT definitely does NOT follows Martin Kings rules, but has been the result of some iterations in box construction. It took Theo 6 different enclosures before he was satisfied with the result. So you could do worse than follow his design.

Greets
Rudolf
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Old 1st June 2004, 12:26 AM   #7
GM is offline GM  United States
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Greets!
====
>http://www.monacor.com/en/produktse...lnummer=10.2310
====
Interesting! I used the site's search function and got no info, so thought it was no longer listed or an incomplete model #.
====
>What kind of software do you use?
====
What's been noted in many TL threads, MJK's: http://www.quarter-wave.com/
====
>I believe the Monacor SPH 135 C is a fine little speaker for TL's but please correct me if I'm wrong.
====
Don't have any experience with any Monacors, but it sims real nice.
====
>I do not need a very high SPL, and I do have a good sub below 80 Hz.
====
Since this one is aneochoically flat to 40Hz, it should be an easy match up (assuming the published specs are ~accurate).

Max flat:

Vb = 0.6ft^3
Fb = 40Hz

L = 33"
S0/SL = 31.402"^2
Zdriver = 11.75"
Zport = 31"
density = 0.2lbs/ft^3
rp = 1"
Lp = 5.5"

All dims inside.

GM
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File Type: zip monacor sph-35c max flat.zip (70.0 KB, 66 views)
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Old 1st June 2004, 09:23 AM   #8
medum is offline medum  Denmark
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Thanks a lot GM

I've been studying Roger L. Sanders book on ESL-speakers, and a part of his book describes building TL-speakers for use with ESL-panels.
His guidelines are:

1 - Area of TL driver end min. 125% of speakerdiapraghm area
2 - Area of TL port end 100% of speakerdiapraghm
3 - Length min. 25% of the length of the fs wavelength


maybe this one works better
(at least it works fine from here)
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Old 1st June 2004, 04:21 PM   #9
GM is offline GM  United States
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Well, with his design concept you have to use a high Vas, Q driver and heavily stuff it to get any LF, and then only a ~infinite baffle response.

Hmm, I see the attachment is corrupted for some reason. Looks fine at my end so let's try again:

GM
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File Type: zip monacor sph-35c max flat.zip (76.1 KB, 53 views)
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Old 1st June 2004, 05:40 PM   #10
medum is offline medum  Denmark
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I'm learning - Thanks again GM!
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