Re: Small questions that don't fit anywhere
2841Some full time amateur advice: I've used this mesa pdf the few times i've had to match any one thing with another.
Re: Small questions that don't fit anywhere
2842I’ve sent that to so many people!!LBx wrote: Thu Feb 12, 2026 5:56 pm Some full time amateur advice: I've used this mesa pdf the few times i've had to match any one thing with another.
In the early 2000s my guitar player bought a “Rectifier” series brand new and I read through the manual, loved that it showed all the combinations.
Re: Small questions that don't fit anywhere
2843I think of it like pipes going into one another by size. Going from a small 4ohm into an 8 ohm allows more electrons to pass more quickly. So, it's fine, less efficient. Shoving a big pipe into a smaller ones crams the electrons together, no good.
Re: Small questions that don't fit anywhere
2845Basically correct but read below....four_oclocker_2.2 wrote: Thu Feb 12, 2026 4:42 pm That said, most of the amps I have run at 4 ohms (Ampeg SVT, Traynor YBA-3.) Am I going to damage anything with the amps having them be mis-matched? My assumption is no, though they may be less efficient.
Not fully correct and if anything its the opposite, though both will be fine. Generally one increment up or down is okay. 4Ω amp into 8Ω cab is fine, but 8Ω amp into 4Ω cab is also fine. Its where you make jumps bigger than one standard increment that it becomes more problematic (i.e. a 4Ω amp into a 16Ω cab).tallchris wrote: Thu Feb 12, 2026 5:33 pm The rhyme I heard, which of course could be totally wrong, to remember impedance mistmaching:
"4 into 8, totally great/8 into 4, pay a whole lot more"
Here's a good summary from one site:
And here's a much more in-depth explanation from a more trusted source, for those that want to get technical.- If speaker impedance is higher than amp impedance, the amp can’t give away all its power. Part of it gets reflected back into the amps output transformer, heating it up. If speaker impedance is much higher than amp impedance (infinite for nothing connected), all power gets reflected back into the amp causing serious damage to the output transformer.
- If speaker impedance is lower than amp impedance, the amp needs to work harder to get the same output level as with an impedance match. Since a tube-amp is limited to how much power it can give, it can never damage itself. The tubes get worn out faster (since they have to work harder) and the amp won’t seem to be as loud as with an impedance match.
Re: Small questions that don't fit anywhere
2846Can't speak to the P90 in particular, but the fralin hum canceling JM pickups I have are really nice.
Re: Small questions that don't fit anywhere
2848Weird, they are neither. They are side by side, lay-flat coils!
Re: Small questions that don't fit anywhere
2849I was going to say, i don't recall offhand - just that they're quite a bit deeper than other JM pickups and I had to raise the action on whatever guitar a bit to accommodate them.
Re: Small questions that don't fit anywhere
2850Single coils, shielding, and RF/EMI hauntings:
My studio seems to have a power transformer outside it. My single coil playing friends struggle to play gainy stuff. If you rotate your body the hum changes, there are okayish directions and awful ones.
My buddy's old tele was copper taped to high heaven, pickguard, pickup cavity and was much quieter.
Here's a probably dumb idea. If I were to copper foil a large sheet of cardboard and mount it on a mic stand or music stand and place it in front of a guitar could it reduce the interference by any significant amount?
My studio seems to have a power transformer outside it. My single coil playing friends struggle to play gainy stuff. If you rotate your body the hum changes, there are okayish directions and awful ones.
My buddy's old tele was copper taped to high heaven, pickguard, pickup cavity and was much quieter.
Here's a probably dumb idea. If I were to copper foil a large sheet of cardboard and mount it on a mic stand or music stand and place it in front of a guitar could it reduce the interference by any significant amount?