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Joined: Feb 16, 2005 Posts: 2765 Location: norwich
Ok, I've just built a bass cab and have wired the jack sockets in. Do I have to earth it before I play it? And if so, how do you do that? _________________
Joined: Feb 16, 2005 Posts: 4696 Location: aylsham
i don't think they have to be earthed, don't take my word for it but when i have taken my cab to bits i haven't had any earthing issues. the only thing that should be earthed is the amp itself, i would have thought there is some sort of breaker in the amp to stop overloading the signal to the cab... _________________ -one person's terrorist is another's freedom fighter-
Joined: Feb 16, 2005 Posts: 2765 Location: norwich
hmmm.
I turned it on and it started to crackle quietly, then started to get louder at the rate reverb does when lean it on an amp.
Then I turned it off.
I think something's wrong... _________________
Joined: Apr 19, 2005 Posts: 5138 Location: At the bottom of the garden, amongst the birds and the bees
Actually the only thing that really matters is the impedance (Ohms). The voltage and current in a cab are tiny - hence it's very unlikely that your wires can't handle the signal - the only issue electrical-wise is the impedance.
The impedance of the cab should match that of the impedance output transformer of the amp, otherwise you can screw up the amp and get other weird effects. I can't remember the exact equations, but parallel lowers impedance (something like 1/Z = 1/Z1 + 1/Z2, where Z1 etc is the impedance of each driver) , and series makes it bigger (added together).
The crackling will almost certainly be dodgy soldering, unless you're amp is boned. A earthing problem would create a constant hum (a ground loop), not a crackle or a growing noise. A noise that keeps getting louder has to be a feedback loop, I can't think of anything else that would cause it. How are you testing it? Have you tried just plugging the amp into the cab and turning it on (with input)? Or just with a lead and no bass (just touch the tip of the lead and see if it clicks)?
PM Errol if you're having trouble, he makes/made cabs and knows his stuff - it's all pretty simple, to be honest I'm not sure where you could have gone wrong to get that kind of problem
Steve _________________ If you're insulted, you're reading it wrong. You fucking imbecile.
"Enlightenment at the cost of my wings is not a price I am willing to pay"
That is very odd, also I have been told that wire is very important in cabs, surely if ou have to buy special speaker cable then once it goes into the jack on the cab and to the speakers the same rule applies, no?
Hi Bill, if you're still having problems with this let me know, I'll help you sort it out.
The cable should make no difference.
Voltage/Current/Impedance are all functions of each other.
Your amp should output a constant voltage gain (depending how your volume knob is set), and the impedance of the cab will determine the current for that voltage.
Ie, if your bass produces 1mV RMS, and you have an amp with a gain of 1000, your amp will output 1V across the load impedance.
Lower impedances will deliver more power to the load, for the same voltage.
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