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Old 24th March 2006, 02:26 AM   #1
jleaman is offline jleaman  Belgium
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Default Davis Driver's Any one used ?

Has any one used the davis drivers > http://www.partsexpress.com/pe/showd...number=297-570

Specifications: *Power handling: 50 watts RMS/75 watts max *VCdia: 1" *Le: .61 mH *Znom: 8 ohms *Re: 6.16 ohms *Frequency range: 45-4,000 Hz *Fs: 43 Hz *SPL: 92 dB 1W/1m *Vas: 1.06 cu. ft. *Qms: 2.46 *Qes: .61 *Qts: .40 *Xmax: 3 mm *Dimensions: Overall Diameter: 6-5/8" by 7-1/2" Cutout Diameter: 5-3/4" Mounting Depth: 2-3/4".


I'd like to see what people have done. I just bought a pair and going to be building a ported 2 way speaker.Click the image to open in full size.
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Old 24th March 2006, 02:30 AM   #2
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While i've never used them they look interesting, but are very very expensive. What tweeters are you going to use with the davis.
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Old 24th March 2006, 02:35 AM   #3
jleaman is offline jleaman  Belgium
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I bought a pair of these.

http://www.madisound.com/cgi-bin/ind...18461&pid=1935

Outside diameter 103.8mm
Cut out 73mm
Depth 24.5mm
25.4mm = 1" = 2.54cm

Nominal Impedance 6 Ohms
Recom. frequency range 2200-25000 Hz
Short term max. power 200 W
Long term max. power 90 W
Sensitivity (1W/1m) 92 dB

Voice Coil Diameter 26 mm
Voice coil height 1.5 mm
Air gap height 2.0 mm
Linear coil travel (p-p) 0.5 mm
Max. coil travel (p-p) - mm
Magnet weight 0.25 Kg
Total weight 0.53 Kg
Voice coil resistance 4.7 Ohms
Voice coil inductance 0.05 mH
Force factor 3.5 N/A
Free air resonance 950 Hz
Moving mass 0.35 g
Suspension compliance - mm/N
Suspension mech. resistance - Ns/m
Effective piston area 8 sq. cmClick the image to open in full size.
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Old 6th April 2006, 07:17 PM   #4
jleaman is offline jleaman  Belgium
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And the graph of the box layout that i have had with.
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File Type: gif kevlar mltl.gif (14.4 KB, 247 views)
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Old 7th April 2006, 05:30 PM   #5
cotdt is offline cotdt  United States
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their stuff seems interesting. this one looks more like a midrange however. i wouldn't use it for bass duties.
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Old 7th April 2006, 05:39 PM   #6
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Default Davis driver

I know both of them. The Davis is too expensive forwhat it worth, but still a good driver, limited application though. Their high Q (0.4) makes them only suitabe for larger Bass-reflex design. It's not totally dry, but pleasant sound. The tweeter is a Seas, very nice device.
IfI would have to choose, I'd take a Scan-Speak 18W/8546 drivers, which requires small enclosure, has also a Kevlar diaphragm, but it's adream of a speaker.

- dan
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Old 7th April 2006, 05:41 PM   #7
jleaman is offline jleaman  Belgium
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Totally a dream speaker. Also 47" tall ill post plans and pictures soon.

Jase
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Old 7th April 2006, 10:54 PM   #8
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Guessing from the aggressive smoothing of the mfr's freq response curve, it may have a peaky high end and require a trap or higher order rolloff. Is the Kevlar coated, (like the ScanSpeaks) or is it bare? If bare, I've seen some uncoated Kevlar cones break up quite harshly.
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Old 7th April 2006, 11:08 PM   #9
jleaman is offline jleaman  Belgium
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It's actually modeled in a nice box with out a crossover at the moment. The box stands 48" tall and is ported out the bottom 2.5" raised from the floor.
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Old 8th April 2006, 10:32 AM   #10
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Quote:
Originally posted by Curmudgeon
Is the Kevlar coated, (like the ScanSpeaks) or is it bare? If bare, I've seen some uncoated Kevlar cones break up quite harshly.
Any Kevlar diaphragm is coated, because if not it wouldn't be airtight. The Davis speakers are not heavily coated though, just a latex-like layer, and also the Scan-Speaks have a more refined coating. To decrease the peaks try the "Sound Varnish 'D' " coating, which brings excellent results (distributed by Strassacker - see www.lautsprechershop.de/hifi/daemmen_en.htm). Don't use the one without the D suffix (D= damping, for Kevlar, Glassfibre, Alu cones and sometimes carbon cones/ domes), this one is designed for paper and fabric diaphragms.

- dan
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