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Old 18th July 2003, 09:14 PM   #1
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Question Making home stereo, cheap power + quality???

hey im planning to make/purchase a 240v Home hifi amp within a year or so

i havn't chosen components yet as there is currently a money issue... lol and i dont want to rush into things

i'm looking for about 300 watts rms/channel and would prefer it to be at 8 ohms, though if absolutely necessary i could probably drop to 4 ohms, it would just mean finding a different type / quantity of components. I want good quality, nothing weighing more than me (48kg or so, im 14) relatively user friendly, stereo (ie. without bridgeing of any L and R speakers) etc.

i am open to any suggestion as to what sort of amps to buy, or even to build, though i would prefer to buy as i have not attempted such a large and expensive project as yet. that said, i can solder, know basics, though not much more, willing to learn and could probably get some help.

If anyone could tell me or give me wiring plans for how to jam a 12v car amp into a power point, i am willing to do so and could possibly even get one for a decent price. That said, i would have to simulate the remote activation, or CD tuner power on, and like I said, i don't want something heavier than I am, and that includes transformers.

I say again that it has to be within a decent budget cos i'd be on a pretty basic wage and am currently still paying off my CAR subs lol.

the speakers would *probably* be something 3 way, with 8ohm tweeters, mids, and either one 300w rms 8ohm sub/channel or two 4ohms. Theres always the possibility of twin 8ohms wired in parallel circut if the load dropped to 4ohm, so its really quite flexible. any less than 4 ohm would not be convenient for the availability of quality tweeters and mids at that impedance and i dont want anything wierd or experimental with variable impedances in the speakers. Also wondering about crossover...They are expensive, do i really need one? could i wire the lot in series and hope for the best? any suggestions appreciated and sorry about the long post lol. cyaz cheers

-Eli
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Old 19th July 2003, 03:30 PM   #2
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I suggest you DO NOT attempt to use a car amp...
Jaycar has a kit for a fairly high powered amp.... perhaps you could have a look into that...

LOSER!!!! HAHAHAHA!!!! WHAT YA DOING MAN!!! hehe... now everyone thinks I am crazy.. lol
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Old 19th July 2003, 04:11 PM   #3
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Default amp purchase/build

You could go for an used NAD 218THX (www.nadelectronics.com) giving a massive 225W/8 ohms rms and almost doubling in 4 ohms. It should be possible to buy this one used for a nice price.

You could also look into building a kit from lcaudio denmark (www.lcaudio.com). They have a digital amp (ZAPpulse) giving 200w/8ohms and you can bridge these modules to get much more power. They are easy to build - almost nothing else than powersupply and input/output connections - and they dissipate almost no heat. They do have more intricate kits like the "The End" class a/b power amp, and the "ZAPsolute mk4" class a amp giving up to 118 watts/8 ohms pure class A (drawing some 400 or 500 watts constantly!). They do also supply the amps as finished products.

Jacob
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Old 19th July 2003, 05:19 PM   #4
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5{e suggestion, I'm checking out the sites now. I could probably build something if given clear wiring charts - and all the required bits lol...

whatever skinnyboy, i know why you got banned from those chatrooms lol....

ahem anyway again thanks for your suggestion, NAD look pretty good, but I'd say those prices would double + postage if imported. I guess that's still not bad, really... Do you know of any sites with component speakers of about that power listed?

Cheers

-Eli
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Old 21st July 2003, 08:45 AM   #5
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Dude, you and I both know you can't afford those.. lol

Get the Kit from jaycar... has everything... you buy those things and you'll need a case and power transformers.. that means add atleast another $200 to the total cost... :S
Get the kit from Jaycar...

It'll give Continuous:
(Per channel with both channels driven)
185 RMS into 8 ohms
255 RMS into 4 ohms

IHF (short term)
(Per channel with both channels driven)
240 RMS into 8 ohms
380 RMS into 4 ohms

$599 Australian.... if ya buy 5 or more you get them for $539... lol

Amplifier, not sure if this will work...

www.jaycar.com.au
Catalog Number: KA-1760
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Old 26th July 2003, 02:48 AM   #6
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Hello,
I just finished 2 500W in 4 ohms amps. I measured at 8 ohms but I forget exactly what the output was.... I think around 266WRMS. Since my rail voltage is lower than the design called for, I only get 408WRMS into 4 ohms. It was from an August, Sept. and Oct. 1997 issues of Silicon Chip Magazine. Dick Smith Electronics doesn't carry the kit any more. I ordered the boards from RCS Radio. They are in Chester Hill NSW Austraila. (+61 2) 9738 0330 I suppose that's the phone number. RCS Radio is on the internet. Bob Barnes is the fellow to talk to. I bought 2 boards and shipping to USA for $50.00 US. Not bad at all.... I think that comes out to be $35 Aus. dollars. Look him up! The boards are fine quality. You will need to get a copy of the article though. There is no silkscreen on the boards. I took a fine, permanant marker and did my own silkscreen and made it very easy on myself. The amps are very quiet and no hiss or hum. I love it!!! I will be writing about them some more when I get my pictures developed. I have started a couple threads on them under "500W amp" look em up man!

Best wishes and good luck,

Chris
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Old 28th July 2003, 02:25 PM   #7
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Thumbs up thanks, I'll check it out

thanks a lot ! I'm not really up to date with things like what that thing u mentioned is, dust cover or something.... but if told what to do i could probably manage. sounds great, but how much wiring would i have to do?

-Eli
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Old 29th July 2003, 03:01 AM   #8
Diode is offline Diode  United States
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Hey,

Since I bought the boards, the only wiring I did was for the power supply parts. Other than that, just stuff the boards with parts. It would take a lot of time if I had to hardwire all the parts on proto board. If you do decide to do it, there are many smart people here that will help!

Chris
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Old 29th July 2003, 04:36 AM   #9
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yeah... I'll gladly offer useless advice...
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Old 29th July 2003, 11:36 AM   #10
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hehhhheheheheh.. kewl thanx
i think i will go along with that, AWESOME price hey? so who do i call and what do i say? (sorry lack of sleep caused by school days amounts to lack of any real independant thinking and even a lack of proper interpretation of..............stupid english teacher.....)

anyway yeah so i think i will go along with it, but who do i call?

thanks heaps oh and cheers skinnyboy

-Eli
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