20 KW amplifiers - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th October 2001, 08:19 PM   #1
diyAudio Member
 
Join Date: Oct 2001
Location: canada
i bought a audiobahn awt34 subwoofer for my car. I need at least a 5000 watt amp that can drive a 1 ohm load. if at all possible ill take a 10 or 20 KW amp for competitions.
does anyone know where i can buy a big amp?

[Edited by yeehaw on 10-08-2001 at 02:54 PM]
__________________
more power?
yes please!
  Reply With Quote
Old 8th October 2001, 08:34 PM   #2
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
You're going to try to pull (20 KW / Efficiency) of power from a car's electrical system? What are you driving?
  Reply With Quote
Old 8th October 2001, 08:45 PM   #3
diyAudio Member
 
dutch diy's Avatar
 
Join Date: May 2001
Location: NL, The Hague
Send a message via ICQ to dutch diy
Wink Re power supply...

You're supprised things ppl to to their car..
A local shop sells 12V 1F capacitors [yes: one Farad] for use in car 'hifi' setup's.
Try to charge that: the engine of any normal 4-cylinder just dies...
  Reply With Quote
Old 8th October 2001, 08:52 PM   #4
diyAudio Member
 
Join Date: Oct 2001
Location: canada
Default 1 farad caps not big

i know my buddy bought a 50 farad cap for his car and added a couple extra batteries. He needs to upgrade his alternator though
__________________
more power?
yes please!
  Reply With Quote
Old 8th October 2001, 09:59 PM   #5
hifi is offline hifi  Sweden
diyAudio Member
 
Join Date: Mar 2001
Location: sweden
50F att 12V? witch low esr/esl ?? (not for backupp= are you kidding me?...do u realise how big that cap would be??

/micke
  Reply With Quote
Old 8th October 2001, 10:27 PM   #6
diyAudio Member
 
Join Date: Jun 2001
Location: Alexandria, VA USA
Default How its done...

Generally, you use multiple amps in some interesting ways. Big jobs like this typically use one amp as a voltage source. This in turn drives lots of other amps simply as current sources. Music is not the test, spl is. That leads to other problems. The drivers must be time aligned to the measurement point, so the mulitple drivers are delayed so that thier wave hits at the same time. Visualize the method that the Germans proposed for thier superguns, where additional detonations are added as the projectile passes. Obvioulsy, the pressure wave must be added at exactly the same time. The absurd high end of these "vehicles" are often measured over 170dB. No human could likely survive in these.

Multiple amps is the only way to do this. Building a 20kw amp is not hard, we do it all the time in broadcast using multiple solid state modules. It is stupidly expensive.

But to answer the question, you will need multiple amps. Build one simple as a voltage amp. One gain stage. Then build as many current supplies as needed to meet your goal. Bunches of MOSFET's are needed, both for the switching powersupplies (they can be slow and nasty as nothing over 100hz is needed), and then the current stages. Your drivers will likely max out at 1kw each, and only a few can be on the same time alignment depending on your driver layout. Rinse and repeat. Be prepared that the top of the line sometimes run over 40kw. BTW, you are not going to buy this - someone is going to build it.

Think piece - just how many MOSFETs will he need for 40kw into this 1 ohm load? Remembr sound quality is not important, neither is high freq.

[Edited by Sawzall on 10-08-2001 at 04:33 PM]
  Reply With Quote
Old 8th October 2001, 10:45 PM   #7
diyAudio Member
 
Join Date: Oct 2001
Location: canada
Default 50 farad cap?

im not kidding heres the manufacturers website
http://www.alumapro.com/cap.html
and at sweet 16 pounds it isnt to big
__________________
more power?
yes please!
  Reply With Quote
Old 9th October 2001, 04:39 AM   #8
diyAudio Member
 
Join Date: May 2001
err, sorry I obviously missed something. The point of all this is ...?
  Reply With Quote
Old 9th October 2001, 05:09 AM   #9
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
Not to worry about how many MOSFETS are needed but more to worry about the 50 foot trailer needed to tow the cooling tower,pond,heat exchanger,and generator unit around behind the car just to keep the whole thing from melting down!
Mark Gulbrandsen
Salt Lake City, UT
  Reply With Quote
Old 9th October 2001, 11:05 AM   #10
diyAudio Member
 
Join Date: Jun 2001
Location: Alexandria, VA USA
Default The point of it?

This is an engineering exercise for some, a compitition for others. It is not musical for this extream care. However, it does have benefit for us in that anytime someone explores the envelope, discoverys are made that we can use. They call it dB drags, and like racing, some of the technology will creap down to us daily drivers. For example, the 1 Farad caps are now reasonable in price (and coming up in voltage too - think of these rated at 100volt at $100 bucks each and how much simpler will your power supply problem become?), and have added some real help to my mear mortal of a car system to resist the voltage drop that even a car battery will see when suddenly faced with an instant 50 amp current draw at 13.8 volts- not that uncommon when driving two 12" subs with even modest levels. (My car has a total of about 1kw of total amps for 10 drivers - high, mid, low and sub) In the past, the rails just drooped and clipping was not far behind.

Some of the switching power supplies that are common in lots of gear nowdays is rooted in car technology (Soundcraftsman was making these 20 years ago). Its made it a great deal cheaper for all of us since these devices are made in the thousands instead of the hundreds that "audiophiles" would have bought. Driver makers are learning a great deal since they have a steady market for big drivers that must deal with huge loads - how long ago was it that a woofer driver would have bailed out at a few hundred watts. Now days, they often can see 1000watts RMS. Sure, most of that is "unmusical" but the technology is used by drivers that we want to hear.

People are exploring 5.1 technology in cars, which is great since soundstage is difficult in cars. This will benefit all of us - think of it as the space race. Sure it was expensive for the pioneers, but we as a whole sure gained a lot from it. For example, they are figuring out ways to deliver that wattage without the need for the cooling towers. How to time align drivers in an exact way. Signal processing. I can go on, but you can see some of the challenges they face and figure out how to overcome. It will trickle down to us. Take in a show and you will be amazed at the quality of the sound they are getting out of thier cars - sure lots of system are built just for thump, but many more are built and judged for true sound quality (winning cars eq to less than .2 db flat) and the car is a much tougher case than your living room.

So like ProSound gear, this segment offers cubic bucks thrown at the designers - we get the benefits in our segment as they learn more.

(Sorry for the length)..
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
what are these....maybe amplifiers??? sonicwave10100 Parts 2 16th January 2006 10:56 PM
pro amplifiers vs. home audio amplifiers bonsai171 Solid State 26 25th February 2004 09:24 PM
amplifiers konky Solid State 4 18th February 2004 12:14 AM
Paradigm amplifiers? Anthem amplifiers? Corn-Picker Solid State 2 24th January 2004 04:10 AM
Many smaller amplifiers vs. bigger amplifiers. djdan Solid State 9 17th September 2002 05:40 PM


New To Site? Need Help?

All times are GMT. The time now is 09:46 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2