Reducing Voltage in a safe way.

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#84
Hmm...

I really don't know how i will drive my beast's !

On my back are 8 Speaker's ( 2 channel ) that are about 1800 W into 8 OHM . As i thinked about an amp to drive them .. i didn't find one afforable , so .. i but the most power kit i can find ... if the trafo will not work .. i will wind a new one and go on ... but i need a trafo calculator or something like this ...

Thanks
 

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#90
You meen the speaker's ??

I have :

2 x 120 W RMS 8 OHM , 40 Hz - 20000 Hz , small , i keep my hand on them

2 x 200 W RMS 8 OHM , 20 Hz - 100 Hz ( limited ) , in the back of me, the big subwoofers , horn on the back

2 x 400 W RMS 8 OHM , 35 HZ - 30000 Hz The center speakers on the back of me

2 x 520 W RMS 8 OHM , 42 Hz - 25000 Hz The big ones with the wite shet on the corners .

And the amp , i will list them in the same order with the speaker's :

Marantz : 2 x 150 W , 8 OHM
JBL : 2 x 300 , 8 OHM , Subwoofer filter .
Crown : 5000 , i don't know how many W have , it's the one with the wite face .
Camco Vortex for the 520 W pair
 
#92
So ypou only need 120W tops right?? perchannel...I guess the schematic here might be something that you want to consider
http://xedox.de/120_watt.jpg
or try the leach amp athttp://users.ece.gatech.edu/~mleach/lowtim/
if you only need a 100 watts...here's a good one at
http://sound.westhost.com/project3a.htm
It has been built by many here...and I'm sure they can help you along the way...the current amp I'm building is the LYNX amp at
http://www.audio-circuit.dk/LYNX_main.html
It has a max power rating at 125W...but you could lower it by using slightly lower voltage rails...
 
#93
Ok ..

I was needing an 300 W amplifier for a new subwoofers ( corner's front ) that have about 280 W RMS 8 OHM , horn load wint many many folding's ... with a clear 20 Hz - 120 Hz response ...

My kit's will come tomorow , i promise a photo of the amp , a schematic of the kit's with may be something intersting , how to get 350 W from 40 V rails and specs about the amp , matching speaker's

bye
 
#94
Hiyee,
it's almost impossible to get 350 W from 40 V rails...unless you are talking about dual 40VAC rails...which when rectified would give you approx 59V rails...that would give you enoguh headroom for a 300W or more amp...a schematic here...
http://sound.westhost.com/project68.htm
I would imagine that you could bridge 2 amps to give you 300W...but you must be careful here...as each amp will see 4Ohms as the load if your subwoofer was originally 8Ohms...and do make sure you do NOT ground any side of the woofer...which would definetly destroy the amps if you did so...I would suggest that you do a bit of reading and research and getting aqquainted to amps and build a few lower power ones before you step right in and build such a big one...300W is a tad too much for home use..I would imagine this is for some outdoor activity???
 
#95
Nope

I like power 🙂)

In my room , witch is 5 meter by 5 meter i have all this power , including the 500 W speakers and the rest of the sistem , but i can't even listen at 1/4 of the volume because blood from my nose came out ... last time i try 1/2 of the volume ... but .. now i'am also interseted in a speaker schematic for a good 800 W rms 8 ohm driver ... 18 inch eminence to match with the Crown 5000
because i think it give at least 800 x 2 ...
 
#96
Going to 800W would mean you need to have a really deep pocket which even I cannot afford...due to the expensive trafos needed...and not to mention the frequent headaches you will experience when u on the amp...wonder if you have cracks on your walls already...800W is just too much for a 5 by 5 room...unless your speakers are really ineffiecient...like 1db per watt...800W will give you 800Db...which is KILLING...I dunno about a 800W schematic anywhere...unless you bridge two 300 watters together...which would give you 600W...even 300W is the max power I have seen in concerts outdoors...okok...maybe those during national day are bigger...but why would you need them in your room...if you are not gonna use the full potential of the amp you might as well not build it...that's my opinion anyway...and take care of your ears ok??Anyways...here's a link for an amp that goes 360W...but you really need a lot of cash to get all the MOSFETs...
http://users.swing.be/edwinpaij/ampli_mosfet_360_w.htm
 
#97
Yup .. i got cracks on my wall .. but i mask them with posters ... one of them can be seen on the outside of the wall .. but .. i don't really care ..

I have a 800 x 2 Amp , that's not the problem , the speaker's is the problem , i need a good cabinet design for them .. not for the amplifier ...

The speakers are :

http://editweb.iglou.com/eminence/eminence/pages/products02/speakpro/om18.htm

with a good 95 dB at 200 Hz
 
#99
Re: Nope

darkm4n said:
I like power 🙂)

In my room , witch is 5 meter by 5 meter i have all this power , including the 500 W speakers and the rest of the sistem , but i can't even listen at 1/4 of the volume because blood from my nose came out ... last time i try 1/2 of the volume ... but .. now i'am also interseted in a speaker schematic for a good 800 W rms 8 ohm driver ... 18 inch eminence to match with the Crown 5000
because i think it give at least 800 x 2 ...
Click to expand...

I think you have enough... I am personally not willing to help you anymore.. its just silly... I have some rather crappy speaker boxes... 91dB 1w/1m 90watts rms... I run them off a 50watt amp, and am able to get all the furniture in my room vibrating... its a 3m X 3m room however... anyway.. I'm working on a 75watt per channel @ 4 ohm, 8 channel amp next... lol in theory it should bridge to give 300watts into 2 channels, into an 8 ohms speaker... 🙂
 
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