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Box less Mid range driver / tweeter

 
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qguy
Intermediate Contributor 75+


Joined: 08 May 2003
Posts: 85

PostPosted: Fri Dec 16, 2005 3:27 am    Post subject: Box less Mid range driver / tweeter Reply with quote

I have this crazy idea of changing / removing the enclosure of the mid range / Hi frequency driver of the 105.2 from the original head unit to a 5-6 inch wide x 2 inch thick pc of wood w/o any side or back walls.. any ideas on the impact to the sound, .I am aware of the cancellation that occurs in woofers .. just not sure of the effect on a mid range driver / JHi frequency drivers
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clem_o
Intermediate Contributor 25+


Joined: 30 May 2005
Posts: 44
Location: Manila, the Philippines

PostPosted: Fri Dec 16, 2005 8:08 am    Post subject: Reply with quote

On a 105/2, that's easy enough to try - pull the head unit out, and remove the backing of the MF/HF enclosure.

I think you won't like the resulting frequency response hole in the LF to MF crossover region!

Cheers
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proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Fri Dec 16, 2005 8:54 am    Post subject: Reply with quote

The cancellation is a function of frequency and baffle size.
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clem_o
Intermediate Contributor 25+


Joined: 30 May 2005
Posts: 44
Location: Manila, the Philippines

PostPosted: Fri Dec 16, 2005 10:39 am    Post subject: Reply with quote

Yep, exactly - its based on the wavelength and the path that the sound-waves have to travel. A 5 or 6-inch faceplate will give you very little travel distance, so cancellation will occur at a pretty high midrange frequency...

Cheers!
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Fri Dec 16, 2005 11:33 am    Post subject: Reply with quote

One other aspect of open baffle designs is that they are unforgiving if the rooms' acoustics are not quite right.
The design I'm thinking of here is the Nightingale NM3 (or the KK3 clone), which can either sound wonderful or like a bag of drive units and that particular design only has a tweeter operating in free field conditions.
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Fri Dec 16, 2005 12:13 pm    Post subject: Reply with quote

The Dahlquist DQ10 was all baffle, and quite rightly as you say was so very dependant on the room acoustics.

Strangely two pairs of 989s are less fussy, but the way you set them up is quite critical regarding the room nodal points.
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