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Old 26th September 2012, 01:36 PM   #1
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Default What to do with a KLH 4" full range?

Hey there guys. I stopped by my local Goodwill and found some small KLH Model 708s that use a single 4" driver. Unfortunately, one of the original drivers was replaced by a Radio Shack unit, but the price was right and I figured I may be able to use the one original driver for a nice center channel to go with some horns (Buschhorn MkII) I built for the Fostex FE103en.

The original cabinets for the KLH are only in fair shape, and are tiny measuring only 8"x14"x4.25" (h/w/d). It sounds pretty darn good as it is but I'd like to put something together to maximize what the little driver can do. (My apologies, Henry Kloss.) I have pretty good experience with wood and lots of tools that I like to use to disturb the neighbors and make a big mess. Maybe a double horn since this speaker will essentially "lay on its side"? Maximum dimensions must be within 8.5"x 32"x19" (h/w/d). Any thoughts?

Junkie
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Old 26th September 2012, 04:38 PM   #2
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Pictures? What RS driver was used as a replacement?

dave
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Old 27th September 2012, 04:45 PM   #3
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Quote:
Originally Posted by planet10 View Post
Pictures? What RS driver was used as a replacement?

dave

Ha! I knew someone would want pictures! It's true KLH in all its ugly, raw glory. I'll shoot some this afternoon and post them.

The RS driver is a 40-1234, shielded 5". Some @#$% tried to pry it out of the cabinet but failed and ended up warping the frame (not to mention destroying the speaker's baffle.) Maybe easy enough to fix, but the foam is a little stiff too and surely needs replaced. Probably not really worth the time to fix it up since pairs of these go on you know where for about $25.
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Old 27th September 2012, 06:13 PM   #4
GM is offline GM  United States
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Looks suitable for skeet practice:

5-Inch Shielded Speaker
(400-1234) Specifications Faxback Doc. # 18295

Nominal Impedance......................................... ...........6 Ohms
Frequency Range............................................. ...90-20,000 Hz
Resonant Frequency (Fs).............................................. .90 Hz
Infinite Baffle Resonance Frequency...................................89 Hz
Piston Area (SD).........................................0.007 5429 Square M
Rated Power Input-Nominal..........................................2 0 W RMS
Thermal Power Limit (PMAX)............................................ .40 W
Flux Density (BL).............................................. ......3.2 TM
Voice Coil Resistance (RE, Ohms).....................................6 Ohms
Voice Coil Inductance (LVC at 1 kHz)...............................0.265 MH
SPL............................................... .........84 +/-2 dB 1W/1M
Moving Mass (MMS)............................................. .......4.22 G
Electrical Q Factor (QES)............................................. .1.48
Mechanical Q Factor (QMS)............................................. .3.36
Total Q Factor............................................ .............1.03
Equivalent Acoustic Volume (VAS).....................................4.74 L
Mechanical Suspension Compliance (CMS, UM/N).....................586.6 UM/N
Mechanical Mass of Cone Assembly and Free Air Load...................4.22 G
Mechanical Mass of Cone Assembly Only................................3.84 G
Free Air Resonance Frequency (Fe).....................................90 Hz
Linear Excursion....................................1 mm Peak-to-Peak (Max)
Cutout............................................ .....4 1/4 Inch (10.8 cm)
Depth............................................. ....2 11/16 Inch (5.8 cm)
Power Handling.......................................... .........20 W (RMS)
Cone Construction Material.....................................Paper Coated
Surround Construction Material................................Urethane Foam
Magnet Weight............................................ .3.6 Oz. + 3.6 Oz.

Speaker Weight............................................ ........22.15 Oz.
Dimensions.............................2 1/2 x 5 5/32 x 5 5/32 Inches (HWD)
(6.4 x 13.2 x 13.2 cm)

Specifications are typical; individual units might vary. Specifications
are subject to change and improvement without notice.


(PH 11/8/95)

GM
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Old 27th September 2012, 10:14 PM   #5
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Got some photos of the KLH driver, here. I included a pic of the crossover too in case anyone was interested. I don't know much about that inductor, but it uses a 35V 150UF cap with a 12 Ohm, 7W resistor.

GM: yeah I'm not sure I'll do much with the Radio Shack driver.
Attached Images
File Type: jpg DSC_4342.JPG (599.0 KB, 157 views)
File Type: jpg DSC_4344 (2).jpg (217.0 KB, 149 views)
File Type: jpg DSC_4359.JPG (527.6 KB, 149 views)
File Type: jpg DSC_4360.JPG (512.3 KB, 146 views)
File Type: jpg DSC_4361.JPG (585.8 KB, 141 views)
File Type: jpg KLH Crossover.JPG (489.2 KB, 60 views)
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Old 4th October 2012, 08:20 PM   #6
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No responses? Well, I need a horn to go with the right and left, so I'm going to get crazy and make my own double horn. It may sound like crap, but should be fun. I'll post photos when I start getting it together.
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Old 4th October 2012, 09:43 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

Its not a crossover, its a LCR EQ circuit for the driver in that box.

rgds, sreten.
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Old 4th October 2012, 10:25 PM   #8
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Quote:
Originally Posted by sreten View Post
Hi,

Its not a crossover, its a LCR EQ circuit for the driver in that box.

rgds, sreten.

Right! I'm an idiot. No other driver to crossover to!
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Old 25th April 2013, 10:33 PM   #9
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Hi, I can't believe you have the same speakers which I bought in a thrift shop as well! I've been trying to find out the model number of mines & thx to you. I finally know it...the one's I bought had rca jacks in the back so i modified them with banana connections to allow me to use them w/banana plugs, and i have to admit they sound brand new! You resolved my search, thx again.
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Old 25th April 2013, 10:38 PM   #10
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Thumbs up Thx for helping find the model number of the same speakers you have (KLH 708)

Quote:
Originally Posted by fmjunkie View Post
Hey there guys. I stopped by my local Goodwill and found some small KLH Model 708s that use a single 4" driver. Unfortunately, one of the original drivers was replaced by a Radio Shack unit, but the price was right and I figured I may be able to use the one original driver for a nice center channel to go with some horns (Buschhorn MkII) I built for the Fostex FE103en.

The original cabinets for the KLH are only in fair shape, and are tiny measuring only 8"x14"x4.25" (h/w/d). It sounds pretty darn good as it is but I'd like to put something together to maximize what the little driver can do. (My apologies, Henry Kloss.) I have pretty good experience with wood and lots of tools that I like to use to disturb the neighbors and make a big mess. Maybe a double horn since this speaker will essentially "lay on its side"? Maximum dimensions must be within 8.5"x 32"x19" (h/w/d). Any thoughts?

Junkie
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