Vintage Synth Repair

A couple of questions to throw out with regard to speakers in Leslie
cabinets, not sure if anybody has the correct answers...

1. I demolished that Thomas organ that I bought for $20 and have created
a new cabinet for the internal Leslie with bits of the organ's cabinet.
Unfortunately, the speaker that was in the Leslie was already blown -
but it was so tiny I doubt it would meet my requirements, anyway.  The
other internal speakers from the organ are not NEARLY robust enough for
my purposes; I already blew up one just for kicks and giggles.  Because
this Leslie is the drum rotor type, I intend to use it as a bass rotor
for use with my Leslie 910 horn section.  I am powering the whole kit
'n' kaboodle with a 50 watt Laney guitar amplifier head through a
crossover.  My question is what kind of speaker I should use for this
improvised bass rotor?  And, before you answer, see the next question...

2. My Laney head, like many guitar amp heads, has switchable impedence
for the speakers.  Does anybody know what impedence the stock speaker in
the Leslie 910 horn section requires?  (The reason I said to wait for
this question is that I'll obviously need the speaker for the bass rotor
to be of the same impedence.)

BaM

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