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plate amp wiring [message #419] Wed, 28 April 2004 21:08 Go to next message
Mike.e is currently offline  Mike.e
Messages: 471
Registered: May 2009
Illuminati (1st Degree)
Hi all i have a simple question

equipment
350watt plate amp
2x20watt mini system with no line in

i used to wire my little 20w amp, like this

mini system with main speakers on the speaker outs as usual
and wire the 20w sub amp in parallel with the speaker outs

This is perfectly ok to do with the 350w amp isnt it? because im driving the speakers ~8ohm and the line level 10k ohm? then the line level isnt actualy being overdriven ?

Il be buying an amp with inputs if i can soon so i can can run my source direct into plate amp to highpass the main speakrs to prevent excess excursion

it arrives tomorow,the plate amp :-) the jbl 2226 will love me for it
Cheers

also [message #420 is a reply to message #419] Wed, 28 April 2004 21:57 Go to previous messageGo to next message
Mike.e is currently offline  Mike.e
Messages: 471
Registered: May 2009
Illuminati (1st Degree)
just realised in parallel the voltage will still be high even if the current is low due to the 10k ohm resistance for example.....


Re: also [message #421 is a reply to message #420] Thu, 29 April 2004 00:31 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)
Are you saying that you connect the input of one amp to the output of another? Some older car "booster" amps were made to be used this way, but I generally try to avoid it if possible. I'd rather use preamp level to drive the amps. Is that possible in your case?

Re: also [message #422 is a reply to message #421] Thu, 29 April 2004 00:46 Go to previous messageGo to next message
Mike.e is currently offline  Mike.e
Messages: 471
Registered: May 2009
Illuminati (1st Degree)
Yes i have to power the 350watt amp from the first,with no Line out,only speaker out

But then i just rememberd-i have headphone output-is this more closer to line level?

Id avoid it too-but my mini system is really crap,and i cant afford another good amplifier yet,

i had to quit my job as ive got a virus,my platelets are low ,so cant work at night anymore,too shattered. i can get another dayjob but earn less

Cheers

and [message #423 is a reply to message #421] Thu, 29 April 2004 00:52 Go to previous messageGo to next message
Mike.e is currently offline  Mike.e
Messages: 471
Registered: May 2009
Illuminati (1st Degree)
heres an example of an amp i could buy
that way i could go Discman ->350watt amp -> the brick amp ->main spaekers


that wud be alot more optimal

only 134$NZ for complete kit also and its TINY

i guess if the sound quality of my discman is too bad i can buy a cheap cd player

Cheers



Link [message #424 is a reply to message #423] Thu, 29 April 2004 00:54 Go to previous messageGo to next message
Mike.e is currently offline  Mike.e
Messages: 471
Registered: May 2009
Illuminati (1st Degree)

copy and paste this into address bar

http://www.geocities.com/basshornguy/jbl.JPG

my new camera is more higher quality than my last


Re: also [message #425 is a reply to message #422] Thu, 29 April 2004 02:41 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)
Man, that sucks about your situation with the virus and your job. I'm sorry 'bout that.

The deal on your amp is that the input is such a high impedance it's not a good match for the output of another power amp. It might be kind of noisy. But it will work just fine so just make sure you have a voltage divider network to drop the input down to 0.775v maximum.

Headphones outputs are usually voltage limited, but they are still relatively low impedance outputs.

Can you split the output from your disc player and run it to both amplifier inputs? That seems like it would be best. What prevents you from doing this?

Re: also [message #428 is a reply to message #425] Thu, 29 April 2004 15:46 Go to previous messageGo to next message
Mike.e is currently offline  Mike.e
Messages: 471
Registered: May 2009
Illuminati (1st Degree)
I thought so.

I referd to my discman because ,if i buy a new stereo amplifier then i could use that and wire it howeveri like eg optimally

My mini system i currently use has nothing but speaker outs and headphone..

Il get a 10k and 1k resistor,on the speeaker out and see how it sounds

Cheers!

Re: also [message #434 is a reply to message #428] Fri, 30 April 2004 04:38 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)
Gotcha. Sometimes that works just fine, sometimes less so. Sometimes it sounds a bit bassy but pretty good other than that. Just depends on the stuff you're hookin' up.

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