It seems weird that strangers actually email me asking questions, but
it's cool i guess. Far and away the most common is somebody
throwing amplifier/speaker specs at me and asking me to draw up a wiring
diagram so i can email it to them. Less than half the time they're
polite about it. A bit more often than not though, it's like this:
"i want to use ur 212 stero/mono wiring diagram i am not compltly
getting your diagram tho as far as the input jacks go i under stand how
a mono one works with the ground and the lead but im not understanding
the stero switching pic that ur using in ur diagram do u think u can
help out me undrstand it better maybe draw me something out that looks
like the acualt input?"
I've been doing this long enough to know that i'm not gonna be
able to help this guy out.
I knew this guy who worked on amps in a really busy repair shop in
Van Nuys and he was telling me that at least twice a week somebody would
come in and say "Ok like i already pretty much know all about how amps
work with the tubes and stuff. Could you just show me how to bias it
myself so i don't have to keep spending all this money on it?"
What do you say to something like that? I mean it would definitely
be funny the first 2 or 3 times, but after that i think most people
would start getting obnoxiously sarcastic about it.
Anyway, i get alot of email asking if it's really ok to use a
9v battery to check speaker polarity and/or how to use a 9v
battery to check polarity. And i never respond to this because i'm
afraid of somebody suing me after they put a 9v battery across the
output from their amp/poweramp to their cabinet(s).
The 9 volt battery speaker polarity check is something i've known
about since first getting into recording. Engineers are so
ridiculous because there is SO MUCH that they will never teach
anybody, but then with things like the 9v battery "trick" they act like
they're giving you this golden nugget from their sage cabinet of
knowledge (or something like that). haha
I still hear people telling other people to use a 9v battery to check
the polarity on their typically $500+ monitors, even though almost
everybody is using powered monitors these days. Yea, go
ahead and start putting 9v batteries across your powered speaker inputs
and let me know how that turns out.
[Sarcasm! Don't actually do this with your powered
Obviously you CAN use a 9v battery to check speaker polarity, and
anybody who wants to know how to do this should go ahead and Google it!