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Old 30th May 2004, 06:19 AM   #1
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Join Date: May 2004
Location: New England
Default Resurrecting Old Speakers

I want to replace the rotted woofers, midrange , and tweeters in my old Jensen model 30 speakers, circa 1979. Speakers will be powered by my equally antiquated Tecnics SA-300 receiver, putting out about 35 watts per side.
The label on the speaker cabinet lists the crossover at 1000hz and 4000hz, but it looks like just an inline filter on the midrange and tweeter. Maybe just a capacitor, I don't know. Freq resp listed at 32 - 20,000hz.
The cabinets are sealed enclosure, and inside dimensions are 14" x 23.5" x 7.6" or 1.447 cu ft.
Here's the choices I've narrowed it down to, but these may be all wrong and any ideas from you pros would be greatly appreciated.
Woofer---- #290-083 Pioneer 10" A25FU20-53F or #295-315 Dayton 10".
Midrange--- #280-020 Pioneer B11EC80-02F or #280-240 Pioneer FB12EU14-51F.
Tweeter--- #275-045 Dayton 1" Titanium Dome or #270-035 Pioneer FBDE75-52F 1" Poly Dome.
It would be a lot easier, and maybe cheaper too, to just buy some new speakers. But then I wouldn't get that d.i.y. satisfaction!
I'm trying to hold the total cost at $150 or so. Any ideas? Any better combinations you can think of?
And would the Pyramid CR31 3-way crossover work well with these speakers? Crossover freq is listed at 800 and 5000hz and dirt cheap at $14 a pair. Thanks in advance.
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Old 30th May 2004, 10:02 AM   #2
dnsey is offline dnsey  United Kingdom
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Join Date: Mar 2004
Location: Shropshire, England
Quote:
It would be a lot easier, and maybe cheaper too, to just buy some new speakers. But then I wouldn't get that d.i.y. satisfaction!
Why not rebuild your original drivers?
There's a lot of satisfaction (and a lot less cost) in doing it that way
Cheers,
Dave.
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Old 30th May 2004, 11:43 AM   #3
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
You'd be miles better off using the cabinets for a pair of these :

http://www.speakerbuilder.net/web_fi...a/lyramain.htm

Over your budget but will easily be worth every extra $.

Note the graphs at the end showing the results of using an off the shelf c/o.


sreten.
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Old 30th May 2004, 03:03 PM   #4
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Join Date: May 2004
Location: New Hampshire
The Pioneer woofer you chose is completely wrong for the job; it will give an F3 of about 100 Hz in your cabinet, so there will be virtually no bass.

Download the WinISD freeware program; it will allow you to enter your cabinet dimensions with an extensive driver base to find what works best. Once you have the required T/S specs you can look at other drivers with equivalent specs for the best $.

After finding the woofer you need to chose the other components based on SPL and crossover requirements that the woofer primarily will determine.
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Old 3rd July 2004, 10:19 PM   #5
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Join Date: May 2004
Location: New England
I've decided to give the "Lyra" mentioned above a try. Sounds like just what I'm looking for. Of course that will come after I first build a mic, mic pre-amp, and Walen jig for Speaker Workshop. Looks like I'll be busy for awhile. Ever notice how simple projects always have a way of snowballing into something bigger?
A few questions about the Lyra.... could anyone tell me how much power a set of speakers like that can handle? What is the formula? Does the woofer determine safe power limits or does the sum of woofer, midrange, tweeter?
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Old 4th July 2004, 03:12 PM   #6
sreten is offline sreten  United Kingdom
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You don't need a mic, pre-amp, jig and SW to build the Lyra.

Speaker maximum power handling is a complex subject for
domestic use, but IMO around 150W program, that is a
150W amplifier not driven into excessive clipping maximum.

Around 50W to 100W driving power is ideal.

sreten.
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