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In Reply to: RE: Series connection of drivers in hi-fi speakers? posted by jackson on September 29, 2014 at 04:51:09
I think you'll find that fairly common when large numbers of identical drivers are used. The Bose 901 uses 1 ohm speakers in series to provide a nominal 8 ohm impedance. I think Roger Russell uses a series-parallel approach with his IDS-25 speakers which use twenty-five identical drivers.
Follow Ups:
For all the time/bandwidth/energy that has been expended slagging Bose in general, and the 901 in specific, that is probably a little known fact.
You won't find too many other cone & coil drivers that are 1 Ohm.
Doesn't it seem like an outstanding challenge to rewire a pair of 901s in parallel & hook them up to those few amplifiers that are advertised as being stable into a "dead short??"
If I had the time, I'd sure be inclined to try it, just for grins! :)
The Bose car stuff often used the 4", 1 ohm driver from a 901 with an amp built in to a plastic box that housed both and was of a proper volume for the driver to perform "well". It also had an EQ circuit based on the environment and placement. I've often called them one of the least offensive pieces of car audio. We repaired them in the 80's and 90's. The amps would go bad, usually caps like 90% of the time, not transistors. The drivers almost never went bad.
ET
Edits: 09/30/14
Good description!
I rather liked some Bose car systems. The old "No highs, no lows, must be Bose," is pretty much ideal for the high background noise environment of an automobile & leads to pretty fair sounding mids. :)
As to the amps? Still see tons of posts on NSX boards about Bose amp failures.
Well, sure, they're probably more than forty years old!
I did car audio for many years and we had good stuff, tube amps and lots of good speakers as most are trash. We had a calibrated analyzer too. Implementing a (mid)woofer/tweeter in a car is not easy, well its easy, just making it sound good and have any image isn't. The typical 6" mounted low on the door panel and tweeter on the A pillar usually sounds horrible. So the Bose with a full range driver EQ'd at the amp worked pretty good.
I found just adding a sub and amp to those Bose systems which then allowed you to turn down the bass from flat at 12 o'clock to say about -10dB at 8 o'clock(AM) gave much better sound from the Bose setup by not asking it to produce all the bass. That job went to the sub that did it much better. It was that way in my 92 Maxima. I just added a single sealed 12" in a very small box and A $200 Kenwood mono bass amp with speaker level inputs (needed since the stock radio had no pre outs)and it did quite well.
ET
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