Two MTM designs by Helmuth
- Thread starter Helmuth
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Helmuth
Active Member
I understand your avatar:thmbsp:
winisd simulation of the bandpass woofer in a closed box and a band pas see the effect.
And here from the basreflex carbon woofer 10 inch -3dB 26Hz
Helmuth
Active Member
Ich wohne und bin in die Niederlande etwa 10 Kilometer entfernt von die deutsche grenze und 17km von Bocholt.
Helmuth
Active Member
The construction,
The BR.
Lay them in line with the wood lines.
tape them
Fold them together and lay in the backplane to fit everything. Wood cut of on 45 degrees.
gleu in the backplane
The result
The same with the bandpass box lay everything down tape them and fold them together. Angles are 22.5 degrees.
The inside
The outside
To gather
Cheers helmuth
The BR.
Lay them in line with the wood lines.
tape them
Fold them together and lay in the backplane to fit everything. Wood cut of on 45 degrees.
gleu in the backplane
The result
The same with the bandpass box lay everything down tape them and fold them together. Angles are 22.5 degrees.
The inside
The outside
To gather
Cheers helmuth
Arkay
Lunatic Member
Your design and execution on those speakers looks very impressive, indeed. If they sound half as good as they look like they should, you must be very proud of them. Einfach ausgezeichnet! :thumbsp:
[Incidentally, I used to live in Oldenburg, and travelled across the border and to the Netherlands coastline sometimes. Went out on shrimp boats for some of the best, freshest seafood I've ever eaten (Yum!). Very nice area!]
[Incidentally, I used to live in Oldenburg, and travelled across the border and to the Netherlands coastline sometimes. Went out on shrimp boats for some of the best, freshest seafood I've ever eaten (Yum!). Very nice area!]
Helmuth
Active Member
capasitor highpass mid of the bandpass. 400uF MKP
Each bandpass has two of these high quality 10mH coils R < 0,2Ohm
Modification-A of the filter in the BR.
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Helmuth
Active Member
The big bandpass I use sound very good the low sound low at low spl and the high keep sounding detailed on low spl. It reproduces the sound off contrabase or bass guitar excellent.
The bass reflex is extreme dynamic sounded thin compared to the bandpass both go down to 20Hz within 10dB.
See the waterfall of the BR.
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Great post, Helmuth! Thanks for the cabinet construction details; I may steal a technique or two.
Very impressive.
Very impressive.
Helmuth
Active Member
I use chip wood with Formica synthetic wood toplayer the fastest and cheapest way to build speakers. Every thing depends on precise sawing.
And nothing is that scratch resistant and professional looking as that finished. Paint is painstaking and expensive. With this technique only precise sawing and glue and you are ready.
Helmuth
Active Member
Why? This is why.
Set up in front of the speaker the testspanel.
Resonance mdf 18mm
Resonance 18mm chipwood
No real difference
18 mm Birchplywood light and strong is good.
What really helps is reinforcement.
MDF 18mm
brichplywood 18mm
And very nice 18mm birchplywood rienforced and 80mm glaswool
Set up in front of the speaker the testspanel.
Resonance mdf 18mm
Resonance 18mm chipwood
No real difference
18 mm Birchplywood light and strong is good.
What really helps is reinforcement.
MDF 18mm
brichplywood 18mm
And very nice 18mm birchplywood rienforced and 80mm glaswool
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