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Post by Michael from Indiana on Jan 17, 2019 21:46:01 GMT
I'm working on a Wurlitzer 3700 which contains two 12" woofers @ 16ohms each and two 6" mid-range speakers @ 8ohms each with an 8 MFD Capacitor. One of the 6" speakers in my unit is broken and must be replaced. My question is, 'would it be easier/better to replace the older mid-range speakers with a set of modern 4 ohm 2-way speakers to achieve the same results'?
Thanks in advance!
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Post by Ron Rich on Jan 17, 2019 23:00:07 GMT
Michael,
IMHO, one NEVER wants to "replace speakers", in any cabinet ! The reason being, that if an engineer has correctly designed that speaker, he has also figured in the cabinet, as part of the total sound system. Changing that speaker may result in cabinet "rattle", or distortion of the audio. If it were mine, I would either get a correct replacement from one of the used parts suppliers listed in our FAQs section, or have it re-coned, if possible. Ron Rich
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Post by Michael from Indiana on Jan 18, 2019 0:24:26 GMT
Ron,
If this were an original restoration I would wholeheartedly agree with you. However, this will be a build for my entertainment room. Thus, all unnecessary components are being stripped, I am installing new wire cover (snakeskin) and adding some modern LED lighting. Soooooo, Im gonnna experiment with the speakers. The original woofers were long ago replaced with magnavox speakers.
The point of my question is merely to confirm my understanding of the electronics and that they could be replaced as described without damage to the amp. I'll deal with any rattle or distortion post-haste!
Thanks!
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Post by Ron Rich on Jan 20, 2019 20:39:55 GMT
I don't mess with WurliTzer amps, but my thinking is you should be OK, as long as the impeadence of your new speakers matches the originals. One aside, on that amp-- If it has not been "updated", it is a known problem amp--go to flippers.com for the updates--Ron Rich
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Post by Michael from Indiana on Jan 21, 2019 20:56:30 GMT
I don't mess with WurliTzer amps, but my thinking is you should be OK, as long as the impeadence of your new speakers matches the originals. One aside, on that amp-- If it has not been "updated", it is a known problem amp--go to flippers.com for the updates--Ron Rich Thanks Ron! I have installed the following speakers, attempting to follow the Service Manual (excerpt attached): 2x Phonograph Magnovox 12" Woofers (8 ohm each) in series on B & G 2x Phonograph Pioneer 6" 3-way (4 ohm each) in series on C & G (see attached wiremap) I didn't know if it was OK to install each channel in parallel with mismatched impedance (1x 8 ohm and 1x 4 ohm) per channel so this is the way I did it. My assumption is that, by wiring in series on two different lines (B & C) I would be well above the MAXs with 8 ohms on the B Line and 4 ohms on the C Line. Am I thinking correctly? I'll check to see if the amp has been updated. It may have been because the box came with a baggie full of electronic components. Michael Attachments:
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