I'm considering building a ~15kW ampliverter for sub-woofer driving 😱 (<100hz) The cost of commerically available class H amplifiers for this application has tempted me to try a modulated smps. The ultimate requirement is to deliver ~2Kw RMS to 8 or more individual speakers.
Problem is that i've never even designed a class-D amplifier let alone built one
, kindof running before crawling...
The requirement for low distortion is very relaxed (however it would be nice to have fairly tolerable harmonic distortion at lower power levels 1/10th peak output)
NE1 Suggest good starting points?
cheers
Robert
Problem is that i've never even designed a class-D amplifier let alone built one
, kindof running before crawling...The requirement for low distortion is very relaxed (however it would be nice to have fairly tolerable harmonic distortion at lower power levels 1/10th peak output)
NE1 Suggest good starting points?
cheers
Robert
I don't think anyone would advise you to start out designing a class d amp with such high power ratings...
A simpler solution would be to look into getting a Crown MA3600VZ (not a class d amp but very good nonetheless) or similar amp capable of doing what you need it to. Would probably end up costing less too.
A simpler solution would be to look into getting a Crown MA3600VZ (not a class d amp but very good nonetheless) or similar amp capable of doing what you need it to. Would probably end up costing less too.
I'm relatively familiar (relative to some1 who populates 1 PCB every 6 months 😀) with tinkering with power amps & supplies etc.. So i thought it was time to save some $$'s & learn something too, hopefully have fun doing it aswell!
I would dearly love to be able to get 4 crown 3600's or even 5000's but the cost of amplifiers in brasil is utterly frightening. I would rather buy myself a new car... I already have the speaker box (well not a box at all, a 7m exponential horn loaded sub tuned to 20hz, built under a stage from about 10 tonnes of bricks & steel reinforced concrete in my nightclub 😎
The speakers themselves are fairly cheap here, some 800w 12" drivers are around $70US each, i anticipate using at least 8 of them, hence the idea of going for around 15Kw.
A good starting point, after i've been tinkering with various pwm designs, i reckon, would be to construct a ~1/2Kw push only amplifier with a fairly low switching frequency (no more than 100khz), i only need to synthesize frequencies to 100hz. If this works without undue quanties of smoke i'll make it push-pull & build parallel output stages.
I'm looking at all the designs on this forum & others to first of all figure out how they work! Then decide on the most suitable design.
So far a fixed frequency tri-wave+comparitor+opto-coupler&mosfet <50Khz looks wonderful in LTspice for sub-bass use.
Hoping to find some suitable & cheap mosfets locally now.....
I would like to be able to drive direct from mains too, as loosing the transformers would save alot. Maybe not a great advantage for the extra expense of more output transistors (and maybe a much higher probability of turning my creation & myself into plasma by accident
cheers
Rob
I would dearly love to be able to get 4 crown 3600's or even 5000's but the cost of amplifiers in brasil is utterly frightening. I would rather buy myself a new car... I already have the speaker box (well not a box at all, a 7m exponential horn loaded sub tuned to 20hz, built under a stage from about 10 tonnes of bricks & steel reinforced concrete in my nightclub 😎
The speakers themselves are fairly cheap here, some 800w 12" drivers are around $70US each, i anticipate using at least 8 of them, hence the idea of going for around 15Kw.
A good starting point, after i've been tinkering with various pwm designs, i reckon, would be to construct a ~1/2Kw push only amplifier with a fairly low switching frequency (no more than 100khz), i only need to synthesize frequencies to 100hz. If this works without undue quanties of smoke i'll make it push-pull & build parallel output stages.
I'm looking at all the designs on this forum & others to first of all figure out how they work! Then decide on the most suitable design.
So far a fixed frequency tri-wave+comparitor+opto-coupler&mosfet <50Khz looks wonderful in LTspice for sub-bass use.
Hoping to find some suitable & cheap mosfets locally now.....
I would like to be able to drive direct from mains too, as loosing the transformers would save alot. Maybe not a great advantage for the extra expense of more output transistors (and maybe a much higher probability of turning my creation & myself into plasma by accident
cheers
Rob
Yikes!! 15KW into 8 drivers loaded into a 7M horn???
Just how much bass level do you need?
Oh yeah. Night Club. Brasil. I get the picture. You can never have too much bass. 😀
Dangerous sounding project....
Just how much bass level do you need?
Oh yeah. Night Club. Brasil. I get the picture. You can never have too much bass. 😀
Dangerous sounding project....
Actually it'll be too much bass by about 15dB! It'll put to rest the old women here who say the system as it stands isn't loud (the bass bins are horn-loaded too & don't sound loud by virtue of low distortion 🙁 The bass at the moment is Four 105dB 50hz horns driven with 5.6Kw for a 90m2 dance floor
heres some pics of it being built, its currently finished & awaiting some juice!
the exponential being built, well almost exponential!
one mouth
the whole sub
the throat minus speakerbox
Not quite as large as that royal device sub, but it'll be a helluvalot louder & experienced by a wider audience!
For the amp i'm playing around, in spice that is, not risking melting a whole load of mosfets yet 😉, with a full bridge design driven from rectified mains, i'm not sure how much noise is likely to leak through from the mains tho, will probably have to do some good filtering in the supply. I still need to check the prices & availability of suitable components too, it's too easy to just pick suitable components when simulating!
Has anyone here tried using mains directly as an amplifier power source?
cheers
Rob
heres some pics of it being built, its currently finished & awaiting some juice!
An externally hosted image should be here but it was not working when we last tested it.
the exponential being built, well almost exponential!
An externally hosted image should be here but it was not working when we last tested it.
one mouth
An externally hosted image should be here but it was not working when we last tested it.
the whole sub
An externally hosted image should be here but it was not working when we last tested it.
the throat minus speakerbox
Not quite as large as that royal device sub, but it'll be a helluvalot louder & experienced by a wider audience!
For the amp i'm playing around, in spice that is, not risking melting a whole load of mosfets yet 😉, with a full bridge design driven from rectified mains, i'm not sure how much noise is likely to leak through from the mains tho, will probably have to do some good filtering in the supply. I still need to check the prices & availability of suitable components too, it's too easy to just pick suitable components when simulating!
Has anyone here tried using mains directly as an amplifier power source?
cheers
Rob
WOW! That's amazing! Stereo??
I hope there will be grilles or gates across the front. You'll want to keep the drunks from crawling up in there. 😀
It's hard to tell from the photos where the divers go. Do you have a diagram of the horns?
Please post these photos over on the loudspeakers section. They ought to get a kick out of it.
Best of luck in your project!!
I hope there will be grilles or gates across the front. You'll want to keep the drunks from crawling up in there. 😀
It's hard to tell from the photos where the divers go. Do you have a diagram of the horns?
Please post these photos over on the loudspeakers section. They ought to get a kick out of it.
Best of luck in your project!!
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