Observation Plywood vs MDF OB - diyAudio
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Old 4th November 2006, 11:53 AM   #1
kaybee is offline kaybee  Canary Islands
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Default Observation Plywood vs MDF OB

Observations
MDF vs Plywood for OPEN Baffle

greetings and hi.

two units of 100 hr burned in
fostex fe 103e units were used?c.

one in plywood OB and one for mdf OB...
mono test.. first.

again, transistor, T amp, many tube amps were
used.

3 different types of rooms were used..
one with much wood type all over,
one with much concrete and stone type all over,
one with both concrete and wood floors and lots of carpet..

overall , the final result is
in the same general direction?c

MDF vs Plywood for Open baffle using such single
full range driver shows a big difference?cand that is?c.

well it comes down to WHY one wanted to see
open baffle , and a single driver full range in first place.

you get this 3 D type magic you see.

Especially if you stick to using good quality
n heavy weight PLYWOOD.

then, the sound from this 4 inch thingie comes at you from
ALL over the room ten feet in any direction.
VERY Enjoyable, you might go into many nites,
listening to all your collection all over again.

using mdf, that 3 D magical sound field just collapses ,
as if you are using a boxed speaker and duh?c
where did the open baffle go ? results in thine face.

overall sound reverb, or whatever one calls it
goes from 10 feet in any direction to few inches.
exactly the 4 inch of the driver.
you can now SEE where that sound comes from.
nothing new. no magic.

if you are not interested in 3 D magic , and are
just looking for DAMPING a squeaky driver,
then MDF is great . i will use it on our door soon.

mdf changes the overall sound effect of the
well known to be shrilly 103e, to much more
toned down ways. mdf can truly CONTROL
the shrew ! yes, but alongwith that shrilly part,
you lost some other stuff too?c

MICRO DETAILS are practically gone with mdf
open baffle and 103e combination.

you are truly back to simple box type spkr cab.

i f you want to go back to that kind of world,
yep?cthe mdf is just what is needed.

mdf Seems to give more body , bass, and
surrounds the anemic plywood daintiness with
something harder , more Solid. but
in doing so, by definition of this action,
Micro and Delicate info is all muffled up and gone too.

however.

since mdf can absorb and control certain things?c
one can USE this Experience to advantage !

mmm
it might be an idea to experiment some more, and
see How to COMBINE mdf and plywood?c
so that both can be balanced in a very
personal and custom way for YOUR Room ?

if something unique works, i will keep you all posted,
maybe with fotos next time.

well
these are our observations and opinions.
yours will vary , of course, and that?fs
the whole point of forums.

in the end, four units of 103e now exist.
2 in mdf, and 2 in plywood
for stereo testing now, at our place.

be good.

k
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Old 6th November 2006, 01:36 AM   #2
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Thanks Kaybe.
Please share your baffle size and thickness
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Old 6th November 2006, 03:55 AM   #3
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I noticed the same thing but I used the Fostex FE126e.I used 3/4" Birch Ply that is two feet wide by 3 feet tall and the 3 - D magic is there in spades.Music sounds so spacious and huge with a wall to wall sound stage.So far I have tried the FE126e in sealed cab's,BR cab's and now OB and like the OB the best.Bass is not as deep as with the 12 liter BR cabinet but it's quality is better and even surprises me at times.Bass in OB seems deeper than bass in .38cu sealed.If I could build a horn I would but I cant so OB it is for now. BTW I don't feel the need for subs at all in my listenig space.[IMG]Click the image to open in full size.[/IMG]
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Old 6th November 2006, 08:54 AM   #4
kaybee is offline kaybee  Canary Islands
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Default baffle size n thickness

thanks for reading all this.

Baffle size is constant at 75 cm x 88 cm

plywood thickness is 1.5 cm or 15mm

spkr diameter hole is slightly off centered, and
not calculated... about 3-4 cm off than
where it would have been centered.


which
pls note...
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Old 6th November 2006, 04:05 PM   #5
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Cool..... your baffles are about the same size as mine.How do you connect your speaker cables to your speaker? I made little binding post block's and screwed them right under the driver.[IMG]Click the image to open in full size.[/IMG]
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Old 6th November 2006, 04:45 PM   #6
badman is offline badman  United States
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Default Hey elfie

Little trick for you Ernest- take a router (or a file) and bevel or roundover the back edge of the driver mounting hole. You can often double the 'free breathing' of the driver, which IME results in better dynamics and fewer response anomalies. It can be surprising to people how much the actual driver mounting and surface of the cabinet/baffle affect things- flush mounting vs. surface, beveling the back of the driver hole for breathing room, edge roundovers, etc.
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Old 6th November 2006, 05:01 PM   #7
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Default Re: Hey elfie

Quote:
Originally posted by badman
Little trick for you Ernest- take a router (or a file) and bevel or roundover the back edge of the driver mounting hole. You can often double the 'free breathing' of the driver, which IME results in better dynamics and fewer response anomalies. It can be surprising to people how much the actual driver mounting and surface of the cabinet/baffle affect things- flush mounting vs. surface, beveling the back of the driver hole for breathing room, edge roundovers, etc.

Hey Badman so you hang out here too...cool.Thank's for the tip I will try it. Your Fostex speakers look awesome did you find a final resting place for the ribbons?
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Old 6th November 2006, 07:55 PM   #8
badman is offline badman  United States
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Yes, they're top mounted on the rethms. I'm very pleased with the results I'm getting from the big rig, so I'm working with the bedroom rig a bit. Currently testing new tweeters (which seem very good indeed, peerless 810921), and will be fiddling with integrating the bassbins (sealed HE 15"s)
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Old 6th November 2006, 08:10 PM   #9
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Quote:
Originally posted by badman
Yes, they're top mounted on the rethms. I'm very pleased with the results I'm getting from the big rig, so I'm working with the bedroom rig a bit. Currently testing new tweeters (which seem very good indeed, peerless 810921), and will be fiddling with integrating the bassbins (sealed HE 15"s)
I think they look nice on top.keep us posted on your bedroom rig.
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Old 7th November 2006, 10:00 AM   #10
marec is offline marec  United Kingdom
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I built a few OB mules earlier this year. I didn't do any a/b testing (too lazy), but I do remember feeling something was missing when I changed construction basis from laminated 10mm MDF - 50mm expanded polystyrene - 6mm hardboard to 18mm ply.
At the moment, I'm trying to reduce the size of the baffle to not much more than the drivers and somehow decouple the wings and am hoping that it doesn't really matter about the construction materials...
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