just yesterday i had finally bought all the parts i needed to run my system( jbl gto 75.2 & jbl gto1200b and a 40A power supply for my room)
basically i want run this from my computer and connected it all up and it works but it aint very loud , could it be cos i dont have a proper sound card, at the moment its connected to the onboard audio port(maybe not enogh volts). or would a preamp sort it not that i no what it is lol
thanks guys 4 any help
You could try a linedriver for the RCA voltage may help.
You should find out how many volts the sound card puts out, that could make a difference. Also, what's the total amp ratings on your jlb amp? A 40 amp power supply sounds very very small for an amp that pulls 1200 watts. I don't know if that's what your amp is rated for, I'm just guessing by the name.
The wattage of the sub means nothing, it draws power off the amp, which draws power off the power supply. So to figure how big the PS needs to be, you take the watts of the amp, and divide it by the voltage the PS puts out. Most are 13.8 regulated, but you have to be careful. So you only need 21~ amps. Just my .02...
I wasn't saying it wasn't enough. Just saying you have plenty of room to play with! I have a 23 amp for my Ham Radio, but it's a good brand and is highly underrated. I've gone in and changed some components, and it'll run up to about 45 amps now. I just wish it had meters built in and had variable power...