So, I have my eye on a nice little 2x10, 400w 4ohm bass cab on eBay. I already own a 1x15 250W 8ohm cab. I would like to use the 2x10 on its own for band practice, but potentially stack it with the 1x15 for gigs. I have an Ampeg transistor head, rated at 4ohms minimum.
I appreciate that, as stock, I can't run the two cabs together using the amp's parallel outputs, as this will drop the impedence to 2.6ohms and therefore be unsuitably low.
However; if I were to install a series/parallel switch between the two speakers in the 2x10, this should give me a series option of 16ohms, which when paralleled with the 1x15 8ohms, gives a total of 5.3ohms, which the amp would be happy with...
Have I got that right?
Comments
It also means that when using both cabs, 2/3 of the power will go to the 15 and 1/3 to the 2x10, which is probably what you want for the fullest sound.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I never think that having switching on the back of speakers is a great idea.
What I really don't like is using the jack switch contacts for it - they're not reliable or high-current enough, and if they fail they will often leave the amp with no load. eg the ones on modern Marshall 4x12"s...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein