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SWR Tower 8x10

#23
Downunderwonder said:
I really wouldn't expect the middle 4 to be wired as one set with top and bottom as the other parallel set, but you never know what some cowboy might have done for no good reason.

Investigation required.
Click to expand...

They could have run pairs of speakers in series, kind of like a 4x10. It would require 2 failures for the middle 4 to stop though. However, the cowboy theory is more likely...
 
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#24
The middle 4 speakers could just be cooked? Could be a host of things already covered in other replies. I picked up a Henry 8X8 that I refurbed. They are 32ohm Celestions. There was one bad speaker, five tired speakers and two good speakers. The LeSon was cooked, too. I replaced all eight speakers w/some custom Eminence, wired exactly to the original spec. Also put an Eminence Super Tweeter. Unit sounds great.
 
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#29
Sprenth said:
looking at the manual online it says they are parallel. I also have never performed a rewiring job.
Thanks for a quick response
Click to expand...
OK...since I didn't read the second page before posting my response, that part of my response dealing with wiring was superfluous so I just deleted it. Still the following is still something you might want to do.

You also may want to check the L-pad, which is where all the wires hook up on the inside of the backplate. If it died it could cause that problem too.
 
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#30
Rip Van Dan said:
Odds are you are seeing that the connections on the back are parallel connections. The wiring inside the cab is not necessarily so. It's not unusual to use both serial and parallel connections with multiple speakers depending upon what ohms the speakers are.

For instance for a 4 ohm 410 cab you might have 4 ohm speakers to start with. Then you could have each pair of speakers wired in series so that each pair has an ohm load of 8 ohms and then wire the two pairs in parallel, which will take those two 8 ohm pairs down to a 4 ohm total cab impedance.

If you are using 8 ohm speakers in a 410 you could wire those pairs in series to make 16 ohm pairs and then wire the pairs in parallel to end up with an 8 ohm impedance cab. You could also do it the other was around wiring the pairs or 8 ohm speakers in parallel making them 4 ohm pairs and then wire the 4 ohm pairs in series resulting in that same 8 ohm impedance cab.

Then, when you add a second group of 4 speakers to make it an 810, you open up a whole other level of options because you can wire two groups of 410's at 8 ohms for each group together in parallel to equal a 4 ohm 810. Since that SWR 810 uses 8 ohm speakers, odds are that was how it was done.

If you are not familiar with how these cabs are wired, you need to either get a wiring diagram from SWR or get someone who really knows how to wire cabs to check it out for you.

You also may want to check the L-pad, which is where all the wires hook up on the inside of the backplate. If it died it could cause that problem too.
Click to expand...

this was my initial thinking. Essentially it’s two 4x10s. Would running them into the Speakon do anything?
 
#34
Maybe someone already said this but I would firstly do some simple investigation. If you can safely remove 2 woofers, a working one and a non-working one, then swap their positions. If the "bad" woofer now works in the position you know worked, then the issue isn't with woofers and I would then start investigating elsewhere in the cab, like solder joints or other internal components. Could be a bad connection or some internal fuse or something simple. I'm assuming it is at least 10 years+ old and has been gigged heavily?

Those things were beastly, but sounded huge. I would not have the desire to carry that anywhere! :smug:
 
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