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6ohm cabs?

#2
Jjdhawg said:
I was looking at some PJB cabs and noticed a couple listed @6ohms. My head (GK MB500) lists 4/8ohms. Does that mean it's still a match for a single cab since it falls in the range the head can handle or does that mean I'd be s.o.l. ?
Click to expand...
6 Ohms is OK with an amp that will drive a 4 Ohm load.
Just like 8 Ohms is OK with a 4 Ohm capable amp.
The power you get out of your GK will be somewhere between the rated Power for 8 and 4 Ohms.

The key to all of this matching business, when it comes to solid state amps is to never go lower than the minimum impedance rating for the amp.

Example:
Amp rated to operate at a minimum of 4 Ohms.
4 ohms or higher like 6, 8 even 16 is OK.
Less than 4, as in 2 Ohms may let the smoke out.
 
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#3
Old Garage-Bander said:
6 Ohms is OK with an amp that will drive a 4 Ohm load.
Just like 8 Ohms is OK with a 4 Ohm capable amp.
The power you get out of your GK will be somewhere between the rated Power for 8 and 4 Ohms.

The key to all of this matching business, when it comes to solid state amps is to never go lower than the minimum impedance rating for the amp.

Example:
Amp rated to operate at a minimum of 4 Ohms.
4 ohms or higher like 6, 8 even 16 is OK.
Less than 4, as in 2 Ohms may let the smoke out.
Click to expand...

Awesome. Thank you.
 
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#5
You never hear anyone say PJB sucks. That is good. Everyone TB hates something, but PJB seems to elude that hate.

You amp will be happy with a 6 ohm cab. If you look up the power output in the manual, you can estimate the power to the cab to be about halfway between the rated power for a 4 ohm cab and the rating for an 8 ohm cab (I am dawning my asbestos flame suit now, just in case). That would be a rough estimate... just a guideline. Impedance, the ohms, vary with frequency, so I think it's best for you to select a cab that is rated at about 1.25 x to 1.5 x the rated output of your amp. Overhead is good. Even with the overhead, you don't want to crank the LF eq and dime the gain and volume knobs. I'm guessing PJB would help you on selecting a very good match for your head, if there is any question in your mind about what to buy.

The only issue I can see is if at a later date you want to get twice as loud, or at least louder, and decide you want to add a 2nd cab, perhaps another of the same type. If you plug two into your existing head, they will parallel and the nominal impedance your amp will see will be about 3 ohms. If that days ever comes, it would be best to sell your existing head and find a head that is rated down to 2 ohms. That's just something to keep in mind in the future. Your amp could be happy as a clam driving two 6 ohm cabs... you don't know until you know.

I'll bet you could call up PJB and tell them what amp you have, what type of music you play, and answer a few of their questions, and they would guide you to a PJB cab that is very well matched to your amp (both for tone and cab safety).
 
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#6
Thanks for the input folks. I was fortunate enough to try out a PJB combo at a local music store a while back; someone was testing various J Basses through his and let me take it for a spin. Only spent a couple minutes on it but I was completely blown away with those speakers. I'll more likely than not pick up an 8ohm cab. Loud enough for what I need plus the option to pair the cab up in the future. Cheers.
 
#7
BadExample said:
You never hear anyone say PJB sucks. That is good. Everyone TB hates something, but PJB seems to elude that hate.

You amp will be happy with a 6 ohm cab. If you look up the power output in the manual, you can estimate the power to the cab to be about halfway between the rated power for a 4 ohm cab and the rating for an 8 ohm cab (I am dawning my asbestos flame suit now, just in case). That would be a rough estimate... just a guideline. Impedance, the ohms, vary with frequency, so I think it's best for you to select a cab that is rated at about 1.25 x to 1.5 x the rated output of your amp. Overhead is good. Even with the overhead, you don't want to crank the LF eq and dime the gain and volume knobs. I'm guessing PJB would help you on selecting a very good match for your head, if there is any question in your mind about what to buy.

The only issue I can see is if at a later date you want to get twice as loud, or at least louder, and decide you want to add a 2nd cab, perhaps another of the same type. If you plug two into your existing head, they will parallel and the nominal impedance your amp will see will be about 3 ohms. If that days ever comes, it would be best to sell your existing head and find a head that is rated down to 2 ohms. That's just something to keep in mind in the future. Your amp could be happy as a clam driving two 6 ohm cabs... you don't know until you know.

I'll bet you could call up PJB and tell them what amp you have, what type of music you play, and answer a few of their questions, and they would guide you to a PJB cab that is very well matched to your amp (both for tone and cab safety).
Click to expand...
I like PB&J. mmmmmmmmm
 

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