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Full range: 4 vs. 9 drivers and total output... (1 Viewer)

Kenneth Harden

Screenwriter
Joined
May 13, 2002
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1,365
...I have a ton of those $.50 4" full range Parts Express drivers they blew out.

I want to make some speakers, and am debating the use of 4 or 9 drivers (those can get me to a nice 8 ohm load), or some other configuration.

First question: How much will total SPL output change between using 4 and 9 drivers?

I want to do a stereo pair in a ported or sealed box (leaning towards a ported box).

Second question: How come when you have more drivers in the same size box, the bass extension DROPS? With 4 drivers in a 1500 cu. in. box, WinISD says it will go WAY lower than with 9 drivers. Is this because there is more air moving in a smaller box, and it isn't as good for low bass? Are there ways around this?

Thanks!
 

Dave Poehlman

Senior HTF Member
Joined
Mar 8, 2000
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3,813

That's because the drivers are acting like one larger driver with a higher Vas.

Vas: "The volume of air that offers the same degree of restoring force on the cone as that of the cone's suspension."

So, you'll need a bigger box to get more extension out of 'em.

Do you have the part no/specs for those drivers?
 

ThomasW

Senior HTF Member
Joined
Nov 6, 1999
Messages
2,282
Slightly more than +3dB from acoustic coupling.

No more Xmax than those drivers have you better go ported.

Don't expect any bass from 4" drivers unless you plan on using dozens and dozens of them.
 

Rory Buszka

Supporting Actor
Joined
Jun 5, 2002
Messages
784
I'd say go with the nine, vertically arranged drivers. You should be able to give them a good 30 watts without trouble, and they'll be pretty loud. You will, of course, want a subwoofer to fill in the low end, though.
 

Kenneth Harden

Screenwriter
Joined
May 13, 2002
Messages
1,365
If I can get to 80-100 Hz., I will be happy, I know I need to use a sub.

I was also thinking a staggered design, like:

o_
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o_
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ThomasW

Senior HTF Member
Joined
Nov 6, 1999
Messages
2,282
Hi Andrew,

Actually there's me ThomasW, and different HTF member Thomas(space)W

My birthday is in April...
 

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