Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 26th March 2008, 07:42 AM   #1
SamV is offline SamV  United Kingdom
diyAudio Member
 
Join Date: Feb 2008
Default 80w rms x 6

Hi guys,

I'm looking for an amp that can do 80w rms @4ohm x6 channels that is as efficient as possible that runs off 12volts.

Any ideas?

It's to go on my new bike sound system system, this is the old one

Click the image to open in full size.

The new one will be similiar in size but at least 3db more efficient output wise, and a fair bit more efficient power wise due to upgraded components.

Any recommendations for amps? At the moment it's using a 4 channel JBL GTO75.4 car amp at 2ohm.
  Reply With Quote
Old 26th March 2008, 09:28 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
buy high efficiency speakers.
__________________
regards Andrew T.
  Reply With Quote
Old 26th March 2008, 10:21 AM   #3
Corax is offline Corax  Germany
diyAudio Member
 
Join Date: Feb 2005
Location: south of lower saxon
Terrific looking bike sound system - good job

Are you interested in building your own amps or do you want to buy what ever is on the market from known manufacturers (like JBL, JVC, Kenwood, Magnat, Pioneer, ...)?

In case you wanna go DIY my recommendations are the followings:

Either you decide to make your own class-D amps (look for such threads here) and the necessary SMPS (can be also found here) or you go for instance, if class-D would be to complicated for you, for class-H, in particular for TDA1562Q (from Philips => http://www.nxp.com/.

For the latter case you also find at least a PCB to buy at http://www.elektor.de/jahrgang/2000/...fe.59985.lynkx

If you've a colleague or friend who collects the magazine ELEKTOR (it's for sure published in NL and D but I'm not so sure about UK), it's in issue 350 from February 2000.

This chip-amp would be the closest to your power requirements with very few additional components and still some worth mentioning efficiency.
Talking about efficiency - considering the limited power resources you're going to "carry" with you (the batteries/accumulators), class-D amps cannot be outdo by other classes if we're talking about efficiency.

Good luck
  Reply With Quote
Old 26th March 2008, 10:58 AM   #4
Bone is offline Bone  United Kingdom
diyAudio Member
 
Join Date: Jun 2004
Location: Dorset, UK
The most you'll get out of 12 v in bridge mode into 4 ohms is about 18 watts!! About double into 4 ohms. To get more you'll need an inverter.
  Reply With Quote
Old 26th March 2008, 09:47 PM   #5
SamV is offline SamV  United Kingdom
diyAudio Member
 
Join Date: Feb 2008
The current subs and speakers are 94db/1w/1m sensitivity.

If the last post is correct then what about all the car amps you see? How can my JBL amp output 4x105w rms or 2x 284w rms?
  Reply With Quote
Old 26th March 2008, 10:04 PM   #6
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Quote:
Originally posted by SamV
If the last post is correct then what about all the car amps you see? How can my JBL amp output 4x105w rms or 2x 284w rms?
The last post is correct. Your JBL amp has what is effectively an inverter or upconverter inside of it.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  Reply With Quote
Old 27th March 2008, 12:27 AM   #7
SamV is offline SamV  United Kingdom
diyAudio Member
 
Join Date: Feb 2008
Ah I knew that though. Stop trying to confuse me lol
  Reply With Quote
Old 27th March 2008, 01:09 AM   #8
diyAudio Member
 
Join Date: Oct 2004
Default TDA1562Q

Hi SamV,

Great system! Corax is on the ball and his suggestions are good. Class D are the most efficient.
I am currently evaluating a TDA1562Q amp kit (class H from jaycar in Australia) for use with a portable system. This chip uses extra capacitors to boost the rail voltage during peaks giving 36w rms into 4 ohms and 70wrms "music power" depending on battery voltage.

Most car amps draw a lot of current are rated at 2ohms and the RMS figures are BS!

Go for the high efficiency speakers. 94db/1w/1m is good but 100db/1w/1m would give you 4 times the acoustic output for the same amp power and battery life.

see here:
http://www.billfitzmaurice.com/

put some wheels on this!
http://www.billfitzmaurice.com/THT.html

maybe the last idea was a bit silly...

Regards Philip
  Reply With Quote
Old 27th March 2008, 07:53 AM   #9
diyAudio Member
 
Join Date: Mar 2005
Location: France
Why not "AMP9 basic" from 41Hz ?

Christian
  Reply With Quote
Old 27th March 2008, 11:35 AM   #10
SamV is offline SamV  United Kingdom
diyAudio Member
 
Join Date: Feb 2008
Trouble with 100db/1w/1m drivers is that they are not usually equipped with handle moisture and are usually expensive and heavy. Though yes 100db would be awesome.

I have had a look at the AMP9, but I'm not an electrical person, and my solder skills are a bit beginner, ideally I just I was hoping to find links to a 2x80w rms @4ohm amp boards which I could get three of and then ask a friend/someone to build them up to plans and then bung in a suitable power supply.
  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



New To Site? Need Help?

All times are GMT. The time now is 08:05 PM.


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