Concert Lead impedance & cab matching

[tetsuya_d]

Hi,

I recently got a Sunn Concert lead (the black-face model with the red knobs) rated at 200 watts, but nowhere does it say the impedance. 

Now, I've got two Sunn 4x12s' rated at 240watts / 4 ohms each. 

So I am wondering, can I drive both of these cabinets with this one head?  The head's got two speaker outputs... so can I just put a cable from each going into each cab?

It's confusing to me, sorry if this questions' been raised before.

[pickinatit]

From this website (Sunn Museum):  The 1979 brochure says that the concert lead was rated for 200 watts @ 2 ohms.
I'm not sure if that would be the "red knob" concert lead or not.
Take a look for yourself:

http://sunn.ampage.org/site/catalogs/1979/1979catp8.jpg

So, two cabs at 4 ohms each =  2 ohms

You should be alright, although there may be other technical reasons why it might not be advisable to run that amp at 2 ohms.  Someone with more technical knowledge will have to chime in with an opinion on that.  I just know that in past threads, at least in the case of the Concert Bass amp, there are those that have advised against running it at  2 ohms even though the amp is supposed to be rated for it.

[CLD]

I believe the blackface Concert Bass is the same as the earlier silverface Concert Bass.  That amp was described as being able to handle two cabs, although I see in my '72 catalog they show it with one 610S, one 312S, TWO 410S, one 412S and TWO 212S.

The '74 catalog "mix and match" chart suggests the following cabs for the Concert Lead: one or two 410S, one or two 312S, one 412S, one or two 610S, one or two 115S, one 215S, or one 612S.  In 1975, Sunn suggested one 612S, two 410S, one 312S, two 412S or one 610S.

That said, here's a really cool clip from Soul Train in 1973: http://www.youtube.com/watch?v=WM5gLyKBGSU&feature=related.  In addition to Mr. Dynamite, James Brown, you'll see his rhythm guitarist has a Concert Lead with two 412 cabs.  (The lead guitarist and bass player have Coliseum rigs.)  As JB would say, "Make it funky now!"

I may have made this less clear rather than more clear, but I figure by '75 Sunn had a pretty good handle on which cabs worked best with the Concert Lead.