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Old 10th October 2008, 05:39 PM   #21
Helmuth is offline Helmuth  Netherlands
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Now here are the pictures of the placed vibraflex a amount of 2,25kg on the panels.
Click the image to open in full size.


By tapping the side panels you can here the effect of the damping. Without you hear for about 0.3sec the panels resonance. With the bitumen it extinguish, faster and the tone got warmer sound.

I wasn't pleased with the damping of the lower panels and ad some more bracing this is very effective.


Click the image to open in full size.


Click the image to open in full size.


To prevent the echo sound of a hollow drum the panels become a absorbing layer.

There was not enough light to make nice photo's sorry.
Click the image to open in full size.
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Old 10th October 2008, 07:24 PM   #22
Nanook is offline Nanook  Canada
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Default Helmuth...

great pictures and documentation!

seeing your implementation negates any concerns I might have has regarding construction, except of course my "anti"-MDF position. Solid wood (or even small offcuts of Baltic Birch) would be better for the bracing, I think.
It will be interesting to see what the end result is like in terms of your listening impressions. I am sure they will be very positive.

So these are for a college instructor? or a college? or as part of a course you are taking? That much I did not get from your introduction (Dutch to English translation)--this is not a criticism of your English.


stew
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Old 10th October 2008, 07:57 PM   #23
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Nanook,
Helmuth probably meant collegue as in friend?

Helmuth,
The last graph with "sandwich ply", what does it mean?
Peter
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Old 10th October 2008, 08:02 PM   #24
Helmuth is offline Helmuth  Netherlands
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Hi Stew,

Quote:
So these are for a college instructor? or a college?
For a college how had bin working in audio business he did sales. And he told about how he loves to visit live concerts.

That way we became talking about audio and he was interested in my view on hifi. (Stereo and quality speakers because there is much to improve, most amplifiers will do great.)

After that I became inspirited to design a speaker witch would satisfy his design taste, and with great performance and appearance for a budget price.

This is for me a way to see my ideas come to live and become more experienced in building.

Here a active 2 way backloadedhorn with 4 visaton TI100 titanium chassis (the small horn) and titanium dome tweeter that I have build for my self in 2000. The big horn was a experiment.

Click the image to open in full size.

Now I am using bandpass low and TI100 lowmid Morel tweeter
Click the image to open in full size.

Here a TL-project that I made for my neighbers.
Click the image to open in full size.
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Old 10th October 2008, 08:07 PM   #25
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Helmuth,
You will make me dig a whole and bury mine tools
These speakers are artistic work!
More pictures please!

Peter
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Old 10th October 2008, 08:15 PM   #26
Helmuth is offline Helmuth  Netherlands
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@Peter

sandwich 18mm birch chipwood.

Click the image to open in full size.

See this link

http://www.hsi-luidsprekers.nl/kastm...nonderzoek.htm
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Old 10th October 2008, 08:24 PM   #27
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Got it, thanks!

Peter
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Old 10th October 2008, 09:42 PM   #28
Nanook is offline Nanook  Canada
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Default Helmuth....

yes, a collegue....

thanks peterbrorsson

Helmuth, all the projects look excellent. The fact that a pair of speakers that you built in 2000 continues to satisfy you must be a testament to the design.

stew (I'm not always overly critical )
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Old 10th October 2008, 10:33 PM   #29
Helmuth is offline Helmuth  Netherlands
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Quote:
The fact that a pair of speakers that you built in 2000 continues to satisfy you must be a testament to the design.
Sounded very transparent deep stage. Due horn impulse behaviour and active set up.
Only inference distortion off four chassis began to irritate. And the response was not flat enough and sub bas is a problem with a horn.

I now have for my self a concept full front loaded response from 35Hz and higher .
With a hybrid triode class A 8W amplifier. It is only a question off time

For now I am waiting for a 24bit DAC to arrive to connect al digital devices to.

I am listening to a yaqin mc10 that I bought second hand in my vacation sounds very good with JJ KT77 and 6n1p EB and 6n23p eb connected to the bandpass 3 way.
Click the image to open in full size.
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Old 10th October 2008, 11:14 PM   #30
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Quote:
I now have for my self a concept full front loaded response from 35Hz and higher .
Pictures, please
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