Hi there,
Have been looking at some commercial amps.
The onkyo A-9555 (http://www.eu.onkyo.com/products/product_en_781919.html) looks interesting.
But perhaps diy is also an option.
Looking for a stereo amp, >60w@8ohm continious with volume control.
Source will be a pc.
Only 1 set of rca and 1 set of speakers is needed.
No need for source selector, bass, trebble, loudness etc.
Budget is 500 euro.
So is there something I can build for that kind of money?
It is not my intention to flame or troll in any way.
Have been looking at some commercial amps.
The onkyo A-9555 (http://www.eu.onkyo.com/products/product_en_781919.html) looks interesting.
But perhaps diy is also an option.
Looking for a stereo amp, >60w@8ohm continious with volume control.
Source will be a pc.
Only 1 set of rca and 1 set of speakers is needed.
No need for source selector, bass, trebble, loudness etc.
Budget is 500 euro.
So is there something I can build for that kind of money?
It is not my intention to flame or troll in any way.
I'm a newbie and I built a 2 channel amp based on Hypex amps.
all you need is a couple of the UcD 180St amps, a HG power supply and a transformer. I bought my transformer here in the UK for aorund £30. The rest cost around 300e direct from Hypex themselves. a few bits of wire and a case and that's it
a day after the bits arrived I had the amp working.
very very easy.
I'm now waiting on their new AD amps before building the other 3 channels for my 5 channel amp.
you'll get lots of support around these parts.
all you need is a couple of the UcD 180St amps, a HG power supply and a transformer. I bought my transformer here in the UK for aorund £30. The rest cost around 300e direct from Hypex themselves. a few bits of wire and a case and that's it
a day after the bits arrived I had the amp working.
very very easy.
I'm now waiting on their new AD amps before building the other 3 channels for my 5 channel amp.
you'll get lots of support around these parts.
"Truth is one, paths are many ..." - The Dalai Lama
Multiple amp modules from a single supply, if its a good one ... or multiple supplies if you really really need that CMRR and isolation between several channels in the same box ... (CMRR = common mode rejection ratio = a measure of the speration between signal paths ... greater than 100 db (relative) is good, more is better.)
Re the Onkyo above: " ... OnkyoÕs exclusive Vector Linear (VL) Digital technology to remove any spike noise before it introduces errors into the inversion timing ... " indicates they may have two digital switching supplies with feedback coming from the output stage of the (probably class-d) amp sections = pretty cool and hard to duplicate as a DIY amp. That Onkyo also hase a whole lot of other features, like pre-amps and "Discrete phono equalizer circuitry ..." that will be likewise, hard to duplicate in a DIY project. (If they had a nice pre-amp, without the amp stages, you could add your DIY Class-D amps to it ... )
Multiple amp modules from a single supply, if its a good one ... or multiple supplies if you really really need that CMRR and isolation between several channels in the same box ... (CMRR = common mode rejection ratio = a measure of the speration between signal paths ... greater than 100 db (relative) is good, more is better.)
Re the Onkyo above: " ... OnkyoÕs exclusive Vector Linear (VL) Digital technology to remove any spike noise before it introduces errors into the inversion timing ... " indicates they may have two digital switching supplies with feedback coming from the output stage of the (probably class-d) amp sections = pretty cool and hard to duplicate as a DIY amp. That Onkyo also hase a whole lot of other features, like pre-amps and "Discrete phono equalizer circuitry ..." that will be likewise, hard to duplicate in a DIY project. (If they had a nice pre-amp, without the amp stages, you could add your DIY Class-D amps to it ... )
For 360 euro aprox you can get 2 BP4078 modules (2 x 400W) plus a 800W switching power supply at coldamp. I bought it as a "pa/subwoofer pack" and this way you will get this price. I have this setup and I won't use a linear PSU again.
If you "only" need 200W or so, you can purchase a "hifi pack", comprising 2 BP4078 + 1 SPS30 (400W switching psu) for slightly less. Check http://www.coldamp.com/opencms/opencms/coldamp/en/coldamp_store/price_lists/ for the prices, I don't remember them well.
In both cases, you don't need _anything_ more so you don't need to spend more money on toroidal transformers, soft start circuit, etc.
All the comments I read also say that coldamp switchers beat HG PSUs in terms of sound quality, bass, etc. My experience is that sound is wonderful and all is light and small.
BTW: they provide _excellent_ support. I was even asked to send them a photo of my setup just to check if all was wired correctly before turning it on!
Just my experience. Hope this helps.
I'll bow out of this conversation.
As a newbie I've no idea what he's taking about. Before going with Hypex I read several reviews of DIY amps and for me Hypex came out the best.
However , not having any knowledge of techie matters I'm not in a position to judge.
In answer to your original question there's lots of ways of building a DIY amp for less than 500e.
In truth the biggest problem you'll have is deciding what case to use!
As a newbie I've no idea what he's taking about. Before going with Hypex I read several reviews of DIY amps and for me Hypex came out the best.
However , not having any knowledge of techie matters I'm not in a position to judge.
In answer to your original question there's lots of ways of building a DIY amp for less than 500e.
In truth the biggest problem you'll have is deciding what case to use!
It's your system and your money, but BP4078 can also be fed by any supply voltage from +/-35 to +/-60V (and they can make your SPS30 or SPS80 operate at these voltages, you only have to tell them), so, depending on the rails voltage you choose, you get:
8 ohm: 70 to 210W rms
4 ohm: 140 to 420W rms
(you can limit the max. output with the input signal amplitude, anyway)
Even if you are only looking from the price point of view:
I think that 1 BP4078 pair costs 200 euro and they _do_ include input wire with connector (hypex ones don't). They include some useful features that I appreciated a lot such as the clipping detector and seem more rudged while sounding very very good.
Besides, Spanish VAT is 16% and in Netherlands it is 19%. So for 2 x UcD400ST you pay a total of (100+7.50)x2 + 19% = 255.85 euro + shipping, while 2 x BP4078 cost 200+16%=232 euro + shipping and you get a product that is at least as good.
Please don't think I have something to do with them (I would like
), but you have to be fair when comparing different products and my experience was very good, so I feel like recommending them to other DIYers.
8 ohm: 70 to 210W rms
4 ohm: 140 to 420W rms
(you can limit the max. output with the input signal amplitude, anyway)
Even if you are only looking from the price point of view:
I think that 1 BP4078 pair costs 200 euro and they _do_ include input wire with connector (hypex ones don't). They include some useful features that I appreciated a lot such as the clipping detector and seem more rudged while sounding very very good.
Besides, Spanish VAT is 16% and in Netherlands it is 19%. So for 2 x UcD400ST you pay a total of (100+7.50)x2 + 19% = 255.85 euro + shipping, while 2 x BP4078 cost 200+16%=232 euro + shipping and you get a product that is at least as good.
Please don't think I have something to do with them (I would like
), but you have to be fair when comparing different products and my experience was very good, so I feel like recommending them to other DIYers.- Status
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