Lazy Cat said:some really strange power level values in this add http://www.bolha.com/oglas2638385. Can this be true or it's just a con. Please help with some advice here. Thanks guys
At the end of URL leave dot out.
To administrator: I just want to buy it so I need help of the members. Please allow to correct the URL. Thanks😉
😕 I intend to use multiple ProJet Power Module for my home cinema system with multichannel processor Lexicon. Is it wise to buy 8 of this modules for 7.1 system or buy something else? The case is that I want to make some DIY stuff for my home cinema. 
Hi Lazyc,
it is not a typing error.
The software that the Forum uses adds a full stop to the end of the address.
You would be better to test any links you give us.
You will find many that do not work as first posted.
"preview" and alter until they work.
Then post.
it is not a typing error.
The software that the Forum uses adds a full stop to the end of the address.
You would be better to test any links you give us.
You will find many that do not work as first posted.
"preview" and alter until they work.
Then post.
Although I do not understand the language (Slovenian?), I do understand the specifications.
From the photograph it seems as if the module is genuine.
It seems to be mono, so you will need two, making the price Euro 500, which seems about right.
To get the full power it seems to need a 100 V supply, which is high. The transformer required for high power plus the power supply capacitors required for high power and high voltage will be quite expensive. So it will not be a cheap amplifier if you want maximum power.
From the photograph it seems as if the module is genuine.
It seems to be mono, so you will need two, making the price Euro 500, which seems about right.
To get the full power it seems to need a 100 V supply, which is high. The transformer required for high power plus the power supply capacitors required for high power and high voltage will be quite expensive. So it will not be a cheap amplifier if you want maximum power.
E250 is a lot of money for what is there, only four pair of plastic outputs.
With real good heatsinking and a real good supply, one might be able to get 500W/4R out of such a module.
In the USA you can buy a two channel amplifier with four pair of outputs per channel, heatsink, supply, chassis (complete working amplifier) for E250.
With real good heatsinking and a real good supply, one might be able to get 500W/4R out of such a module.
In the USA you can buy a two channel amplifier with four pair of outputs per channel, heatsink, supply, chassis (complete working amplifier) for E250.
HI Gordy !
You're correct about the language, but for the module I'm not so shure; that's why I'm looking for different comments - opinions. Eight modules is not so easy to waste and I hope they'll offer me some discount for that amount. Stakes are high ...
You're correct about the language, but for the module I'm not so shure; that's why I'm looking for different comments - opinions. Eight modules is not so easy to waste and I hope they'll offer me some discount for that amount. Stakes are high ...
djk said:
djk, please quote the URL for that economic amp you mentioned above because I would need eight channels for 7.1 home cinema system. The only condition for the amp is that it should be capable to deliver 1000W/4ohms (arround 180Vpp) just because of very high clipping level not power itself. 
I will be very surprised if you really need 1000W.
However the Aussie Amplifiers NX1000 module will give you what you want:
http://www.aussieamplifiers.com/index3.htm
If you would consider a lower power level, then try the following links:
For a switching amplifier try the well-regarded modules from Hypex: http://www.hypex.nl/ (see their UCD700)
For 'conventional' amplifiers there have been good reports about the products of these two companies:
http://www.aksaonline.com/products_2.html (the designer is Hugh Dean on this forum)
http://www.ska-audio.com/diy/003.html (their forum is at http://www.ska-audio.com/Forum/YaBB.pl)
Good luck.
(All links checked and working at time of posting)
However the Aussie Amplifiers NX1000 module will give you what you want:
http://www.aussieamplifiers.com/index3.htm
If you would consider a lower power level, then try the following links:
For a switching amplifier try the well-regarded modules from Hypex: http://www.hypex.nl/ (see their UCD700)
For 'conventional' amplifiers there have been good reports about the products of these two companies:
http://www.aksaonline.com/products_2.html (the designer is Hugh Dean on this forum)
http://www.ska-audio.com/diy/003.html (their forum is at http://www.ska-audio.com/Forum/YaBB.pl)
Good luck.
(All links checked and working at time of posting)
Thanks Gordy. I would like to give you my impression about the links you posted:
1. It looks Aussie amp NX1000LU has exactly the same number of output devices as ProJet Power Module only that it looks bigger and some kind of obsolete layout design. It has only a few transistors in votage gain stage and expects to be stable and perform exact amplifying to output stage. Output stage is MOSFET for which is very problematic to parallel four output devices because the Cgs would be couple of nF's and rise/fall time is out of acceptable levels for good transient response of the amp.
ProJet claims to give 1000W/4ohms so it's stronger at much smaller volume/layout surface that's why I won't consider this as better choice
2. I do not preffer PWM D-class amps because I don't see the reason to chop nice sine wawe at amp input. Also UcD700 is only 600W/4ohms, bigger and it's expensier (260 EUR) with no reason
3. AKSA amplifiers have only 100W not reaching THX approved levels. Please consider that I'm looking for the home cinema amp channels
4. SKA amp has also four pairs of output devices but only 300W of power and looks some kind of old fashioned design, like Elector - GIGANT amp from eightes
So Gordy it looks we should still search the net for some other options 🙂
1. It looks Aussie amp NX1000LU has exactly the same number of output devices as ProJet Power Module only that it looks bigger and some kind of obsolete layout design. It has only a few transistors in votage gain stage and expects to be stable and perform exact amplifying to output stage. Output stage is MOSFET for which is very problematic to parallel four output devices because the Cgs would be couple of nF's and rise/fall time is out of acceptable levels for good transient response of the amp.
ProJet claims to give 1000W/4ohms so it's stronger at much smaller volume/layout surface that's why I won't consider this as better choice
2. I do not preffer PWM D-class amps because I don't see the reason to chop nice sine wawe at amp input. Also UcD700 is only 600W/4ohms, bigger and it's expensier (260 EUR) with no reason
3. AKSA amplifiers have only 100W not reaching THX approved levels. Please consider that I'm looking for the home cinema amp channels
4. SKA amp has also four pairs of output devices but only 300W of power and looks some kind of old fashioned design, like Elector - GIGANT amp from eightes
So Gordy it looks we should still search the net for some other options 🙂
And Gordy, nobody needs eight times 1000W/4ohms for home cinema system if you concentrate to power level only, but if you follow the transient response of the output signal you can easily have immediate clipping with amps where power supply rails are lower than +/- 100V 😀
8 Kw total power for home theater? Now that's overkill!
PS: I'm with djk, not enough output devices for 1000/4 ohms.That black hunk of metal on the bottom (heatspreader?) would melt.😉
PS: I'm with djk, not enough output devices for 1000/4 ohms.That black hunk of metal on the bottom (heatspreader?) would melt.😉
MJL21193 said:
What else I can do now. I'll buy two ProJet Power Modules and test them. If the amp will blow at 1000W/4ohms I may not be able to come back. I mean seriously, what it will be, will be ... report folows.
1KW/4R requires ±90V from a regulated supply with no loss in the amplifier at all and in excess of 22A per device (based on four pair). The Beta on PNP high voltage outputs drops like a rock above 10A.
"NX1000NL"
Output device has an RDS on of about 0R85 over temperature, so with 22A it will drop about 20V across itself, so we need at least ±110V rails (regulated) to do 1KW/4R (and an even higher rail for the front end). Did I mention that the BUZ901 is only rated for ±100V?
"URL for that economic amp "
http://www.musiciansfriend.com/product/Tapco-Juice-J1400-Power-Amplifier?sku=483049
http://www.sweetwater.com/c456--TAPCO--2_Channel_Amplifiers
"NX1000NL"
Output device has an RDS on of about 0R85 over temperature, so with 22A it will drop about 20V across itself, so we need at least ±110V rails (regulated) to do 1KW/4R (and an even higher rail for the front end). Did I mention that the BUZ901 is only rated for ±100V?
"URL for that economic amp "
http://www.musiciansfriend.com/product/Tapco-Juice-J1400-Power-Amplifier?sku=483049
http://www.sweetwater.com/c456--TAPCO--2_Channel_Amplifiers
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