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Old 17th September 2012, 08:52 AM   #11
AndrewT is offline AndrewT  Scotland
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Don't believe him !
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 17th September 2012, 09:26 AM   #12
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Old 17th September 2012, 01:16 PM   #13
Rixsta is offline Rixsta  United Kingdom
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Hey ok thanks

The Le Monstre can work from 2x 12v car battery's i can see that working and that's a nice possibility.

the JLH seems to be single rail but about 27v to power so... 2x battery's again which ill do if i have to.

Originally Posted by AudioSan View Post
you can also use a SMPS DC-DC supply for car amps. then you will stand a little more free regarding supply voltage.
i'm thinking about this for a F5 as car amp wich may be a better choise if you are using 4ohm speakers.
Sounds great ill have to get a DC-DC supply like that. The F5 ? i do love the sound of that amp but the PSU is +/- 24. is there a light or mini version of the amp around ?

Im actualy going to buy from ebay a broken Car amplifier you know the kind with large heat sinks 1000w amps etc as the chassis is perfect, I consider this a great idea as the terminals and all the plugs ill need will be already wired in too! Might as well make use of old parts!

I can imagine probably the most wise solution would be using an amp that's Class A/B.
but i have some kind of idea in my head that pure Class-A id like better lol
and a more efficient amp for the sub woofer/bass...

Last edited by Rixsta; 17th September 2012 at 01:18 PM.
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Old 17th September 2012, 01:25 PM   #14
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the 10W JLH runs on lower voltage.
with a DC-DC converter you can have +/-40V if you like.
siliconray have a 500W adjusteble sec and dual rail supply.
something like that is good for 2ch F5. you can also use F5 with lower voltage and bias to make a mini F5 but are you going to run it in 4 or 8ohm?
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Old 17th September 2012, 05:09 PM   #15
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Hi Rixta. It's not uncommon in car audio to install a second alternator and battery. That and an SMPS would give you whatever you want. My only thought was the comment that an F5 needed an hour to sound its' best. I am rarely in my car for more than an hour but that's just me. I think it's a great project. Good luck! Pics!
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Old 17th September 2012, 05:14 PM   #16
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regarding the warm up time. that is with passive cooling.
and you can't use that in a car you must use forced air cooling. and then you can have a temp control on the fans. so the worm up is done in 10min
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Old 18th September 2012, 02:22 AM   #17
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Thanks Audiosan! That makes perfect sense. I love the idea. Gotta find room for another alternator... and cook up a balanced input to match my car's head unit.
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Old 23rd September 2012, 09:38 PM   #18
Rixsta is offline Rixsta  United Kingdom
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Well thanks for the replys! i was originally planning on building something but interestingly i ended up with an already built DIY "Le Monstre"!
which i purchased from ebay, it will be interesting to hear how this thing sounds.
i wanted to win it so i kept bidding right to the last moment

Here it is
2x20 watts

Car Amplifier Class A, 2x20W (J .Hiraga schematic) no audison, brax, dls | eBay

Any Comments ? ill have to see whats in it!

I think ill also find or build a JLH and Mini-A some time too so i can compare and give feedback here. ill probably be running 8ohm speakers on the amps.
I agree about the F5 needing time, however it seems to sound good within a couple of minutes of on time.

As regard to the "20W Le Monstre" I just have one question i need help with, what kind of battery's should i buy ? it would be nice if they were not as big as a giant car battery. i should think i would have the amp on for 3 hours at a time max. usualy 1. then i need a good charging circuit to charge batterys from mains. for some reason i imagine having 2x series 6v battery's that's what my intuition tells me, but you can tell i don't really know what im doing yet lol

for now ill run it from a PSU buy battery's later i think

Iv'e not realy looked into how much this monster draws.

Cheers Riki

Last edited by Rixsta; 23rd September 2012 at 09:47 PM.
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Old 10th October 2012, 06:56 PM   #19
winslow is offline winslow  United States
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Was curious about those, but didn't know how noisy they were...if they were.
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