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Old 14th April 2007, 06:58 PM   #1
Salsero is offline Salsero  United States
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Default speaker with two full range drivers

This may be a dumb idea, but being a newbie I will ask. Is there any merit to making a speaker with two identical full range drivers? I know the arrays are always matched to keep the same impedance and two drivers will cut the impedance by half. Will it help sound stage, separation, etc..... I am trying to build something here with some $$$ constraints and this is an off the cuff idea. Thanks for your replies in advance.
Salsero
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Old 14th April 2007, 11:13 PM   #2
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One way to do it ,is to put the second driver to the backside the speaker.This way the baffle step correction is not needed,as many people are against the filters (not me ).



Also with 2 identical drivers the output level and power handling can be doubled.

Just to give you some ideas...
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Old 15th April 2007, 07:28 AM   #3
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Default Re: speaker with two full range drivers

Quote:
Originally posted by Salsero
This may be a dumb idea, but being a newbie I will ask. Is there any merit to making a speaker with two identical full range drivers? I know the arrays are always matched to keep the same impedance and two drivers will cut the impedance by half. Will it help sound stage, separation, etc..... I am trying to build something here with some $$$ constraints and this is an off the cuff idea. Thanks for your replies in advance.
Salsero
Look at the DIYParadise site.
Check the section on Coral speakers. There's a twin Flat 8 box, I think.

Doug
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Old 15th April 2007, 07:49 AM   #4
hm is offline hm  Europe
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Hallo,

check my double horns:

trombone, Posaune, Saxophon

http://www.hm-moreart.de/1.htm
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Old 15th April 2007, 08:29 AM   #5
Svein_B is offline Svein_B  Norway
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Using two FR drivers on the on the same side (front) of the cabinet is generally not recommended. Two (or more) sound sources will ceate comb-filter effects for frequencies above a few KHz. The effects will be a very uneven FR response for the higher frequencies if the listener is not exactly on axis.

Download the Baffle diffraction simulator The Edge to experiment with the effects of baffle shapes and multiple drivers.

A bi-pole solution should be OK, or alternatively using the second driver only for the lower frequencies (below the baffle step).

SveinB.
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Old 15th April 2007, 08:46 AM   #6
hm is offline hm  Europe
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Hello,

look:

http://www.fostexspeaker.de/gehaeuse/85k_encl.pdf

they must do it for the Xmax.
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Old 15th April 2007, 10:46 AM   #7
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2 FR drivers, bipole are fine. 2 FR drivers, in separated sections of a cabinet, wired to run dipole are OK (assuming you design it properly) One on the front, one on the side, or firing upward is also OK. Two on the front panel? Bad idea, unless you roll the lower one off before lobing occurs. ROT: lobing will start from the point at which the centre-centre spacing between two drivers exceeds 1 wavelength. For example, in the case of the Fostex FF85K cabinet, I'd expect it to start at ~4.1KHz.
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Old 15th April 2007, 03:38 PM   #8
Geoff H is offline Geoff H  Australia
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"Will it help sound stage, separation, etc..... I am trying to build something here with some $$$ constraints"

Have you considered open baffles with full range drivers? That will get you going, and if required bass helpers could be added at a later date.

It will provide a wide sound stage.

Geoff.
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