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supercharged 8th October 2010 08:15 PM

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 :p

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 -

The drivers -

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! :p

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

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)


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,


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