Question on connecting amp to 2 cabs

ADHD_4Ever · #1 05-13-2011, 12:48 PM

Ok, so I just got my hands on an old Fender 300 PS ('78?) which is in great shape for its age. Had it serviced and retubed (saved the original GE 6550A's). It's 300w at 8ohms, all tube. The problem I'm having is that I know eventually I will want a full stack, but almost all 8x10's are 4ohms, and if I daisy chain in parallel with 2 4x10's at 4 or 8 ohms I still will be under my minimal impedance. So I think my best choice is to go with 2, 4x10 4 ohm cabs and run them in series, although I know this is not a common setup. I have seen a few diagrams online on how to make a series speaker cable to run from my amp to the input on both cabs (power Y adapter?), but nothing conclusive for someone with minimal electrical knowledge. I guess my main questions would be 1) Could someone point me in the right direction for directions to make the Y adapter in series and 2) how to hook up said adapter to the cabs - do i need anything else besides the output on the amp and the 2 inputs on the cabs? *Side question - I have have heard most cabs are wired in parallel/series - does this matter to the amp as far as load is concerned when combining 2 cabs? Sorry for the length of this whole post, but I am very confused on this matter.

Edit - I may want a 4x10 and 1x15

**Thor** · #2 05-13-2011, 12:52 PM

Different rules apply to tube amps.

Edit:
Read here.

Fender 300PS Bass Amp

ADHD_4Ever · #3 05-13-2011, 01:09 PM

Sorry, I don't understand what you are directing me to. I actually had read that thread when deciding to buy the amp. I am more concerned with how to get 2 cabs connected to this beast (hopefully a 4x10 and a 1x15). Could I re-wire 2 4ohm cabs in full series for 16ohms, and then daisy chain from the amp output, to first cab input, first cab output to second cab input?

Calaverasgrande · #4 05-13-2011, 03:15 PM

looked up that amp, it does say that it want an 8 ohm load. Nothing about 4 ohm loads mentioned. Even the schemo only shows an 8ohm tap.
I would skip the idea of a 4x10 and 1x15. That has been thoroughly debunked around here.
Basically the 4x10 is going to be enough louder than the 15 that you are pretty much using the 15 as a stand for the 4x10.
You might want to look at wiring a couple 4 ohm 2x10 or 2x12 into (internally wired series)16 ohm cabs, then pluggin them in parallel to hit 8 ohms.
Me personally I would just get a nice old Mesa Boogie 15" cab that is 8 ohms. Mesa made a 2x15 that is 8 ohms as well.