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Old 16th November 2002, 05:52 PM   #1
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Default Volt BM 2500.4

Hello!
Has anyone tried this driver?
I am going to build a subwoofer using this driver.
Is it really good or maybe there are others that are
better at this price point?

Greets,

Adam
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Old 17th November 2002, 12:12 AM   #2
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Default TOO MUCH.

Hi,

Look at the specs for your speaker:

BASS MIDRANGE LOUDSPEAKER 250mm (10")
Bass Midrange in Studio Monitors

FEATURES: The BM2500.4 uses a massive magnet with a symmetrical field, extended pole and long voice coil for maximum linearity. The cone, linen surround and dome are critically matched and doped to ensure very low midband colouration. The result is analytical sound quality with a stunning dynamic range. The BM2500.4 is designed for use in two way nearfield studio monitors where accuracy and realism are essential.

Not being an expert on subwoofers common sense tells me this speaker is not ideally suited for the task:

Nominal Diameter
250
mm

Power Capacity
200
watts

Sensitivity
92
dB/watt/m

Frequency Range
25-2500
Hz

Impedance
8/16
ohms

Bl Factor
15.5
N/A

Voice Coil Diameter
75
mm

Voice Coil Material
Copper

Maximum Excursion
25
mm (before damage)

Magnet Assembly Weight
8.1
Kg

Effective Moving Mass
0.048
Kg

Compliance
0.0005
M/N

Volume displaced by unit
2
litres

Connection

Metal push terminals

Chassis
Painted diecast aluminium

My feeling is you're going to pay a substantial amount of money for a well extended woofer and throw away a lot of that bandwidth in the process.

Many alternatives exist but it's hard to recommend anything at this point.

Cheers,
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Old 17th November 2002, 06:58 AM   #3
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Default Re: TOO MUCH.

I think Frank is making the right call on this. It is an extended range woofer, not a subwoofer. I am sure it is excellent for what it is designed for, which is to extnd up to a tweeter and still move a fair amount of air.

But for subwoofer duty, i bet any number of the dozen or so mid-priced and very competitive 12" would handily outperform it for a fraction of the price. And if you wanted to spend the same price...

dave
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Old 18th November 2002, 07:13 AM   #4
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Quote:
But for subwoofer duty, i bet any number of the dozen or so mid-priced and very competitive 12" would handily outperform it for a fraction of the price. And if you wanted to spend the same price...
Ok, so what driver would U use?
I live in Poland so some of american drivers are unavailable here.
Please bear that in mind.

Greetz,

Adam
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Old 18th November 2002, 07:47 AM   #5
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Quote:
Originally posted by Adam
Ok, so what driver would U use?
I live in Poland so some of american drivers are unavailable here.
I believe that better value can be had if you can minimize the shipping you have to pay so i'd rule out the yankee drivers.

The Peerless 10 & 12" XLS come highly recommended.

But i also wonder if there are any sleepers made locally or close-by (former Soviet Union) that would be worthwhile pursuing?

And i always like to use subs in pairs if i can (push-push is a cheap trick to get better performance.)

dave
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Old 18th November 2002, 07:55 AM   #6
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Quote:
And i always like to use subs in pairs if i can (push-push is a cheap trick to get better performance.)
Isn't this config called Isobaric?? Form what I know Vb goes
down by 50 percet in such a cofiguration. Is there a big enough
difference to justify the cost of another driver?

Adam
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Old 18th November 2002, 08:19 AM   #7
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Quote:
Originally posted by Adam
Isn't this config called Isobaric??
Not usually. It is possible to make a push-push isobarik but really gets convoluted.

Click the image to open in full size.

Both drivers face the outside world and are in phase but are mounted such that the reactionary forces are cancelled, dramatically reducing the load on the box and improving the micro-dyanamics.

dave
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Old 18th November 2002, 08:34 AM   #8
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Oh, thanks a lot

Adam
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