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according to some, there is a difference between the tone of the two wirings.
the biggest voice on the subject i have heard is gerald webber - boutique amp builder.
he claims series-parallel has more branch inductance, parallel-series has less. this means series/parallel has less highs, better low end and more crunch. parallel/series will be overall a bit tighter, have more highs and a little less low end.
the differences are said to be subtle, and i have not tested myself so can't say one way or the other.
would it make an audible difference with an amp running off a 386? highly unlikely i would guess, but easy enough to test it.
jim's diagram in his post has series/parallel on the left, parallel/series on the right. looks to me like the only difference in the finished wiring is a link across the bridging wires between the speakers - why not put this wire in with a switch? then you can flick between to two and see what you think!
e
I think we're getting into real cork-sniffer stuff here! I'm thinking the difference would be barely audible, if at all. That said... It'd be fun, easy, and pretty cheap to put a switch in to see the difference for yourself!
Jim
In theory, if the speakers are perfectly matched, the voltage at point A will equal the voltage at point B.
Therefore, when you close the switch, no current will flow through it and nothing will happen. It should not sound any different at all.
In practice, the speakers will NOT be perfectly matched, and there will be some small amount of current in the switch. Whether that is enough to make any audible difference... well... let us know!
Jim
You are very much correct jim, it does indeed look like this series/parallel vs parallel/series thing may be a fairly large pinch of mumbo jumbo, however speakers aren't resistors, and inductors are funny things.
but i was thinking...
the noisy cricket will happily output from 4 to 16 ohms, so why not wire 2 speakers in the cab in parallel, for 4 ohms, and 2 speakers in series for 16 ohms, put in a switch to flick between the two? i would be very suprised if you couldn't get a tone/frequency response difference with that, and there might be gold there somewhere...
lots of folks report a tonal difference between a 2x12 wired for parallel vs a 2x12 wired for series, even with transformer switching so the output section sees the same load.
experiment onwards tom!
Here's how you could switch a 2-speaker cab with a double-pole double-throw switch (DPDT):
In one position, you have a 4Ω parallel circuit. In the other position, you have a 16Ω series circuit. I've color coded the wiring to help keep + and - straight... Don't forget the jumper wire at the top of the switch.
These 2 positions will likely sound different since the different impedances are making the amp work differently. They will probably be louder at 4Ω, because I believe the 386 amp chip is optimized for maximum power transfer at 4Ω.
There is no easy way I can think of to make a 4X cab with 8Ω speakers come out to 4Ω (without additional power wasting components... or not using all 4 speakers!)
Jim
thank's for the info and drawing's jim, handy to know,,
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