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Old 29th March 2005, 01:12 AM   #1
cominup is offline cominup  Viet Nam
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Default Build up box 4 unknow dirver

Hi all,

I've just got a pair of fullrange "Made in the Republic of China". A little data: 8Ohms, input rate 5W; max 10W, dia. 25cm (10"); weight: 4kg (~8lbs) each. It sounds good in open air.

Now I'm considering to build Back Horn or Bass reflex. Could I measure this pair? Or are there some design could match with some things like that?

It was fantastic when I put it in room corner, so I gues that it could make some very deep smooth bass if be putted in some match box. In fact, I love Back Horn more than Bass reflex.

Thanks in advance,

Cominup
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Old 29th March 2005, 03:03 AM   #2
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Default Re: Build up box 4 unknow dirver

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Originally posted by cominup
Hi all,

I've just got a pair of fullrange "Made in the Republic of China". A little data: 8Ohms, input rate 5W; max 10W, dia. 25cm (10"); weight: 4kg (~8lbs) each. It sounds good in open air.

Now I'm considering to build Back Horn or Bass reflex. Could I measure this pair? Or are there some design could match with some things like that?

It was fantastic when I put it in room corner, so I gues that it could make some very deep smooth bass if be putted in some match box. In fact, I love Back Horn more than Bass reflex.

Thanks in advance,

Cominup
If they sound good in free air, I would guess that the Qts is too high for a bass reflex enclosure. That's only a guess, but inexpensive speakers do tend to have very large Qts, because the magnet is usually small. The intended application may be to put them in a wall or ceiling, "infinite baffle" style. In any case, you would indeed need to have measurement equipment to design a bass reflex box for them. The same is probably true for a back loaded horn. Your best bet might be just to put them in a rather big sealed box with some poly fiber stuffing in it.

But what do I know?
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Old 29th March 2005, 03:23 AM   #3
cominup is offline cominup  Viet Nam
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Thank you Dave,

Pls, be attention that they were very old (<1965), not normally china (I said that "Made in the Republic of China" ). Rite now, its hard to see some product marked like that.

Could you suggest some schema???
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Old 29th March 2005, 08:31 AM   #4
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Could you suggest some schema???
Just a thought, but you could always try an open baffle. I know these often aren't well regarded, but you can get some decent sounding results from them, even if measured performance isn't great. I seem to recall reading about a pair using Goodmans drivers on a wooden baffle with curved glass extensions or wings at the side, which helped keep things looking subtle.
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Old 30th March 2005, 12:29 AM   #5
cominup is offline cominup  Viet Nam
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Hi,

Yesterday, I've tryed box of old BLH Japanese speaker (OTTO, FAD) but for 20cm speaker. It's so good but got lack a bit of bass, then bass not clear enough and disturbance (I really don't know this word could describe enough my feeling).

So, I will offset this design 1.5 times bigger or more. How do you think if I paint some thing in side horn? Because inside of OTTO, I saw some black spray, I don't know what it is.
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Old 30th March 2005, 01:01 AM   #6
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