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Multi-Way Conventional loudspeakers with crossovers

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Old 6th December 2005, 12:55 PM   #1
sreten is offline sreten  United Kingdom
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Default cheap project in the UK

Hi,

I took a punt on a pair of these :

http://www.maplin.co.uk/Module.aspx?...46717&doy=6m12

The c/o is a single capacitor to the tweeter. Anyone interested
in buying these and measuring them with a view to developing
a decent crossover ?

(They don't sound hideous at the moment, but could be better)

/sreten.
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Old 7th December 2005, 02:11 PM   #2
Vikash is offline Vikash  United Kingdom
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Ok, I'll bite. They do look nice and I've just seen they're active!

Have you done anything with them so far? Taken any measurements?
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Old 7th December 2005, 02:34 PM   #3
Did it Himself
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Is the electronics in one speaker only, or are they proper twins?
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Old 7th December 2005, 02:42 PM   #4
sreten is offline sreten  United Kingdom
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Hi Vk,

hold your horses a minute, my problem is I don't have
any measuring equipment (except my ears of course).

Using a test CD basically the midrange / lower treble
is all over the shop (presumably due to poor integration
and / or uneven midbass unit response).

The units don't look too bad, 25 for two standard 19mm
tweeters, two 4" midbass units, two nice looking boxes
and an active amplifier doesn't seem too bad to me.

(I'll improve the boxes if I can improve basic performance)

I've inserted some foam acoustic damping (there wasn't
any), and detuned the ports (foam lining) but still the
bass is a litttle strong / underdamped around 100Hz.

With measurements the c/o design shouldn't be too
difficult as the amplifer has bass (for bsd correction)
and treble (generally useless) tone controls.

/sreten.
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Old 7th December 2005, 02:47 PM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by richie00boy
Is the electronics in one speaker only, or are they proper twins?
Hi Rb,

What do you want for 25 !? no they are not proper twins.

The amplifier is built into the right speaker.

The amplifer is a nice little unit with a decent heatsink,
the transformer is attached to the base of the speaker.

/sreten.
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Old 7th December 2005, 03:20 PM   #6
Did it Himself
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Yes fair enough they are cheap. It's probably worth adding blocks inside the drine speaker?

Good to see you back BTW
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Old 7th December 2005, 03:25 PM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by richie00boy
Yes fair enough they are cheap. It's probably worth adding blocks inside the drine speaker?
Good to see you back BTW

Hi Rb, I don't understand your comment, /sreten.
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Old 7th December 2005, 03:29 PM   #8
Vikash is offline Vikash  United Kingdom
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I think he meant drone perhaps? As in to even out the internal volume I would suspect.

Anyway, I couldn't resist playing and ordered a pair. I'm sure you can't go too far wrong at that price.
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Old 7th December 2005, 03:45 PM   #9
Vikash is offline Vikash  United Kingdom
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Manufacturer page on these speakers for ref: http://www.microlab.com.cn/en/produc...ERIES/B-73.htm

Quote:
These 2-way speakers from microlab feature top notch materials and high quality construction for unmatched fidelity in computer speakers. The wooden cabinets are made from 12mm (1/2 inch) MDF for low resonance. The 4" ported woofer provides punchy bass with a rubber surround that won't rot away like foam or paper and the 1" semi-dome tweeter ensures crisp highs. The built-in 12WRMS amplifier has an external heatsink to shed excess heat, and features high quality volume, bass, and treble knobs. Overall, these are great speakers for the money and you probably won't find a better value in computer,DVD,TV,home theater speakers.
And they're made out of 12mm MDF!
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Old 7th December 2005, 04:10 PM   #10
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Vikash
I think he meant drone perhaps? As in to even out the internal volume I would suspect.
Hmmm... the possible problem is the cabinet is too small or the
basic Qts of the driver is a little too high causing the excessive
bass behaviour around 100Hz.

Either way you don't want to be reducing the internal volume
if you can help it. I'm quite happy to have slightly different
bass alignments left and right - least of the speakers problems.

Quote:
Originally posted by Vikash
Anyway, I couldn't resist playing and ordered a pair.
good man !

/sreten.
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