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Old 8th October 2010, 07:15 PM   #1
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Join Date: Oct 2010
Default Amplifier advice for 5.1 system

Hi guys and gals,

I am new here, but DIY is my bag baby! I have built a few bits and bobs in the past, including a 15" folded W horn that cracked the ceiling in my student house

My electronics knowlege is not bad, but mostly automotive based, I have a car with a self built, open source injection system called megasquirt.

As for DIY amplifiers and source control, my experience is limited to internet research so far! I love HiFi audio and watching films, so to combine the two brings me great pleasure, currently we have a 50" Samsung plasma, kenwood AV reciever, eltax centre rear surrounds and sub, and mission floor standing fronts.

Now the kenwood is sounding a little worse for wear, it is about 6 years old and has gained a constant background hum and the rear channels are getting crackly.

My proposed project is as follows -

Speakers -
Fronts will be made by my father and I, they will consist of a pair of tops that contain 6" woven glass coned mid range drivers and soft dome tweeters. A combined rating of 120wrms per channel at 6 ohms.

The bass will be provided by a pair of folded horns containing 10" MB quart reference drivers. These drivers contain two 200Wrms voice coils of two ohms each, I propose to wire these in series to create a single 4 ohm 400w coil.

Quick sketch of the boxes -
Click the image to open in full size.

The drivers -
Click the image to open in full size.


The centre will be possibly an 8ohm Dali Ikon rated at 100Wrms.

Rears will stay and are rated at 8ohms and 60Wrms.



Now, my ideas for driving the speakers are a little vague, however I do have a few hard and fast rules, I would like amplifiers to be seperate from the source control, I do not want the decoder and all the delicate low level signal control to be right next to a 500va toroidal transformer!

I think one of these will do the trick for My 5.1 decoding -

Click the image to open in full size.

For the other amplifiers I would like to use some of the following -

For the front tops, a TA2024 90Wrms Per channel -

eBay - The UK's Online Marketplace

The centre vertically bi-amped and rears on a four channel LM4780 gainclone -

eBay - The UK's Online Marketplace

and I am unsure of what to do with the bass drivers, I think a twin mono setup, so two seperate amps running around 200Wrms each, may one of these -

dual mono HIEND power AMP ,2*200W 8ohm finished on eBay (end time 07-Nov-10 16:08:56 GMT)

or

ChinaDIYNO.10 power amp,120W*2 assembled&tested on eBay (end time 07-Nov-10 14:45:12 GMT)

So what do you guys think? Will the amps be suitable? What direction should I take with the bass amps?

Any advice will be of great help guys.

Thanks in advance,

J
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