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Mullard speaker box strange impedance resonances
Mullard speaker box strange impedance resonances
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Old 15th March 2019, 04:23 PM   #21
turk 182 is online now turk 182  Canada
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so the small enclosure is raising the resonance... my advice was wrong...sorry.
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Old 15th March 2019, 04:41 PM   #22
Galu is offline Galu  Scotland
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We remain confused as to powerpz's problem. He said that his original box produced too much bass, accompanied by some vague sound effects!

At this stage, your suggestion remains as worthy of experimentation as any other!
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Old 15th March 2019, 04:46 PM   #23
powerpz is offline powerpz  Bulgaria
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There are lot of advises, very interesting and many thanks all of you! Recommended construction for this speaker is TL or open vent, this driver need "to breath", there are many projects in the net and all are opened.
Vas is pretty big and I am afraid that so large aperiodic box is not suitable for my room

I suppose that reducing enclosure volume will eliminate the lowest bass, which one is not desirable. My target is to suppress range somewhere between low and mid frequencies, they are pretty high levels.

Advantages of 9710 are very high sensitivity (on this box is about 100db 1W/1m) and wide range - up to 17kHz, for my tube stage 2W per channel is excellent. Karlson design is very suitable, but not so easy to design and also dimension are high, looks old and I do not want to leave Mullard box and to give up without fight.

Is this enclosure somewhere between bassreflex, horn and open baffle, what you think? And can it has some of their characteristics? Of course this suggestion can be quite brave, but for me it is not typical bassreflex type and my feeling now is that closing or changing the vent will modulate somehow the nice middle frequency by some standing waves ot other side effects. Experiments with port which I did only makes ALL bass (low and mid) lighter and affect middles and scene in negative direction. For me Austrailan Mullard engineers did a very good job and can recommend this enclosure for fullrange enthusiasts.

Ok, as discusses adjusting of damping will be point of my next experiments. I will try putting some wadding cones exactly to speaker rear side, I am afraid that it can reflect to middles?

I am open to receive advice how to remove oldschool cottonwool curtains (original plan, posted by me at the beginning) and to replace with modern damping material, but where, how, how much and on which sides

Cheers
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Old 15th March 2019, 05:34 PM   #24
planet10 is offline planet10  Canada
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Mullard speaker box strange impedance resonances
Quote:
Originally Posted by Galu View Post
Absolutely - nice illustration!
An actual measurement of on eof our early midTL lines in one of our early WAW experiments.

dave
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Old 15th March 2019, 05:37 PM   #25
turk 182 is online now turk 182  Canada
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hey P10 what do you think...if the port volume of the original Mullard design was filed with a sandwich of fiber fill layers compressed by wire mesh layers enough acoustic resistance could be achieved to create an aperiodic bung of sorts...?

if Powerpz built the box as per the drawing i wonder if the side panels are vibrating (might be some of the U U Uh is from that) there's no cross or lateral bracing shown in plans, maybe make the "curtain" locations the new home of some holey braces..?

Last edited by turk 182; 15th March 2019 at 06:06 PM.
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Old 15th March 2019, 06:12 PM   #26
turk 182 is online now turk 182  Canada
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additional thought why can't he run a sweep to identify the frequency of the ever mysterious uu U U UH UH
he does own a computer,no?
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Old 15th March 2019, 06:17 PM   #27
planet10 is offline planet10  Canada
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Mullard speaker box strange impedance resonances
OK, the Q of these is not as high as i remembered (as per Troell’s measures). 100 litre sealed works, i could not find a decent vented alignment.

I have sims, i will get them processed and put them up.

So sealing these should be an improvement, making them aperiodic probably even better yet.

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Old 15th March 2019, 06:21 PM   #28
turk 182 is online now turk 182  Canada
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Quote:
Originally Posted by powerpz View Post
this driver need "to breath"
yeah you what it to breathe but you don't want it to sound like Darth Vader...do you?
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Old 15th March 2019, 06:54 PM   #29
powerpz is offline powerpz  Bulgaria
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Quote:
Originally Posted by turk 182 View Post
yeah you what it to breathe but you don't want it to sound like Darth Vader...do you?

Please let me know what to measure with "sweep" ? Is it some kind of software? I will provide you results
I am also thinking that some brices can stable the construction and improve sound quality
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Old 15th March 2019, 07:08 PM   #30
turk 182 is online now turk 182  Canada
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anybody got a link for REW or something that this man can use...too many scotchesss naptime...
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