View Full Version : Fitting my HTPC amp with amp11-hv
I got very inspired by V-bros amp4-hv. So inspired that I have promised my 2 amp9 to a friend, I thought I would put in amp4-hv instead.
There is no amp4-hv at the moment, so I am thinking about putting in 7 amp11-hv instead. Also putting in amp4-hv would mean replacing my transformer.
I have a 2x18V, 650 VA toroid transformer. I will get 51V peak to peak from that. My speakers are Jordan JX92 rated 4 ohm and 50W RMS. I guess amp11-hv will handle 4 ohm at 51V?
Then I need to build a 50V 650W power supply, or a few smaller. Any suggestions?
It will handle 4 ohms, sure... It will be a great project, I think one couldn't wish for something better for a HT amplifier. Mono modules are so much more versatile for such a purpose and the AMP11 has the finesse to sound great on the mid-high range and the drive to handle subwoofers too.
About the power supply. Each board can deliver roughly 250W of power, so for 7 boards the supply would ideally be 1.5KW at least. Probably you will get away with another 650VA transformer and power three on the one supply, four on the other. Then make sure the PGND is connected all the way through on all boards.
Nicer would be to take a bunch of 250VA transformers like this:
http://www.baco-army-goods.nl/componenten-elektronica-onderdelen/transformatoren/ringkerntrafo-2-x-30-volt-8-amp-250va.html
And a bunch of large rectifiers like this:
http://www.baco-army-goods.nl/brugcel-1000volt-35amp.html
And a couple of caps like this:
http://www.baco-army-goods.nl/componenten-elektronica-onderdelen/condensatoren/elco-4700uf-80volt-van-nippon-chemicon.html
or:
http://www.baco-army-goods.nl/componenten-elektronica-onderdelen/condensatoren/nippon-chemicon-elco-1000uf-63volt.html
or even:
http://www.baco-army-goods.nl/componenten-elektronica-onderdelen/condensatoren/nippon-chemicon-elco-1000uf-50volt-5-stuks.html
And maybe a few:
http://www.baco-army-goods.nl/componenten-elektronica-onderdelen/condensatoren/condensator-klem-35mm-kunststof.html
Or seven PS3 power supplies or a few PS1....
It's all still fairly affordable....
V-bro, does the amp11-hv sound as good as the amp4-hv?
The drivers kan handle only 50W continous, 100 W peak. 7 * 50 = 350 W. I think I will keep my 650 VA transformer. I will most probably only listen to music using 2 channels anyways.
So no electronics to stabilize the voltage? I like it :-). With those Condensator klems I don't even have to build a PCB!
V-bro, does the amp11-hv sound as good as the amp4-hv?
The drivers kan handle only 50W continous, 100 W peak. 7 * 50 = 350 W. I think I will keep my 650 VA transformer. I will most probably only listen to music using 2 channels anyways.
So no electronics to stabilize the voltage? I like it :-). With those Condensator klems I don't even have to build a PCB!
You can perhaps keep it more simple and parallel the transformer, maybe wind some extra thick windings on top to make the 18Vac higher? at 36Vac the voltage is so high the 650VA is on the low side even for half the amount of amps.
You may even consider taking normal AMP11 amps and use the 18Vac voltage as is?
AMP4 has a lower damping factor which I consider sounding a tiny bit more fluent and sweet than the AMP11 in the higher range. The AMP11 however has a tiny bit more control over the lower frequencies. They are both amongst the best you can get for the whole range and the AMP4 with STA517B can even be considered a great subwoofer amplifier. With lack of comparison I would not be able to tell the two amps apart. The difference is even so subtle that even when they are side by side the difference is hard to tell apart. After extensive listening periods the difference is certainly becoming apparent though....
Yes, all the power supply parts I linked to can be used without PCB when you are a bit handy... :)
It may be a good idea to build a separate power supply unit for the whole thing. This will make it more versatile for future plans, keep the noise of mains voltage out of it and you can always upgrade the power supply or amplifiers easier.
Personally I would perhaps even go for a bunch of two channel amps fully encased...
I know I am not making choices easier, but I can help out on building the AMP4-HV units? Make a -HV upgrade kit for instance?
YES! More10 is READY for:
A 7.1 AMP-11-HV with 2-4ohm speakers (with some 11-HV paralleled together for sub/main=11x 11-HV):
http://www.baco-army-goods.nl/lichtnet-voedingen-adapters/collins-pp4415-voeding-27-volt-100a.html
http://helmut-singer.de/img/collinspp4415.jpg It is utilitarian, but you can move it into another case or 19" rack!
Let V-bro build it, I think he would love to do it for fun maybe...
Let V-bro build it, I think he would love to do it for fun maybe...
I would, only my present lack of time urges me to ask favours in return. I remember myself very well contemplating while building stuff "for fun" for guys I don't know while I could have some quality time with my family instead....
I used to never be able to say no, but I know now it doesn't get me anywhere....
I KNOW you're right.
At least you still have fun with all this, and this proposed 'beast' would be a challenge; challenges are fun!
Well, if more10 can think of doing something like he proposes, he can spend a bit on 8-11 well built AMP-11-HV's. With that PS, oh yes!
Hmmmmyes!http://www.radioparadise.com/scripts/tiny_mce/plugins/emotions/img/eusa_snooty.gif (http://javascript<b></b>:EmotionsDialog.insert('eusa_snooty.gif','Snooty') ;) .
Thanks for all your suggestions. Thanks for offering to build amp4-hv V-bro.
But I will use amp11-hv since it can handle my 4 ohm speakers, and I can reuse my existing trafo. I will build them myself since I very much enjoy building stuff myself. I will try to reuse my old box: http://www.41hz.com/forums/showthread.php?2259-Finished-my-8-channel-HTPC-amp&highlight=htpc, the one looking like a space ship ;-). If I cannot fit 7 amp11 in that box I will do a 5 channel amp instead.
For my subwoofer I am in the process of bulding an amp7.
For 4 ohm speakers of 50W (max?), and 18Vac available, you might as well take 11-LV, they can do the job too, and a quicker build.
Pricewise, all 11's are about the same, weird.
Pricewise, all 11's are about the same, weird.
'Tis true, but in the LV version you get a polyfuse and prebuilt inductors (worth more $), and in the higher-voltage versions you get less capacitance overall ... so it kind of balances out
'Tis true, but in the LV version you get a polyfuse and prebuilt inductors (worth more $), and in the higher-voltage versions you get less capacitance overall ... so it kind of balances it out
Well, that's good then! Take 11-LV ! (those pre-made inductors are good, too!)
Well, using 18V and amp11-lv I will basically the same as I already have with my amp9. What I am after is higher voltage and thus better dynamics.
I will need to measure the box though before deciding.
Well, using 18V and amp11-lv I will basically the same as I already have with my amp9. What I am after is higher voltage and thus better dynamics.
I will need to measure the box though before deciding.
Depends, not exactly actually because the AMP9 has a lot of pre-fixed settings which are adjustable on the AMP11... Depends because if your set-up has never allowed the AMP9 to reach max output voltage there is definitely something to win from an amp which can be adjusted to do reach that output voltage....
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