4 channel DSP amplifier by Thomann

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Joined 2008
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I have recently discovered this: https://www.thomann.de/gb/the_t.racks_dsp_4x4_mini_amp.htm - I wonder if anyone tried it and maybe tweaked it a bit? There were some complaints about the amplifier noise. I have the two DSP units without the amplifier and I was just about to order a second 4 channel amp (EPQ-304, pretty good, but with fans), but then I found this one. The use is a 4 channel stereo system / PA, 50 W per channel is plenty, all bands are high efficiency horns🙂

A pair of these amps would make a really nice and compact setup.
 
I saw this a few months ago and thought it looked good for things like desktop setups but then I read:
"The only really terrible shortcoming:
If the thing gets power, 100% of the signals go to the output for about 1 second, only then do the DSP settings take effect."
which makes it quite unusable for a crossover.
 
@kipman725 I hope this issue is solved with new firmware - I recently updated my DSP units and now they finally load the correct preset too. Version 1.0 was not really perfect.

@grahamgraham It is not too flexible, the best feature for me was the delay to compensate for the horn paths. And the xover. It is by far the cheapest and pretty good 2x8 setup.
 
I have also been eyeing these, but since the specsheet isn't too flattering, haven't ordered yet. Still a candidate for a modest 2-way stereo setup or who knows a development platform for new projects. I have a secret love for this kind of cheap but feature-rich products 🤭

Not sure if these have threads, but another two attractive t.racks products. 4-channel powerful amp with dsp: https://www.thomann.de/gb/the_t.amp_quadro_500_dsp.htm And 8-channel FIR processor: https://www.thomann.de/gb/the_t.racks_fir_dsp_408.htm If only they didn't have fans... Kind of funny to put a fan into a rack-size aluminum-cased device with power consumption of 20 W.
 
I doubt the FIR processor actually needs a fan or if so could be modified to have close to silent cooling. have a Symetrix processor that is rated ~80W, it came with a small high speed 40mm fan that moved very little air and the unit ran a little warm for my taste (its full of Xilinx Spartan 6 FPGAs so does have quite high power consumption). I removed most of the top cover replacing it with steel mesh, fitted a quiet 40mm fan with speed reducing resistor and modified my equipment rack with low speed 80mm fans that push air across the unit resulting in quiet cooling that is far more effective than the stock 40mm fan.
 
I bought the_t.racks_dsp_4x4_mini_amp.htm about 2 weeks ago and used it for a bit over a week to find out the best settings
for a modest 2-way stereo setup 😎.
I was pretty close to finalize the setup but then when I switched on the amp next morning, it made kind of a mechanical noise from inside, and remained off, despite power being supplied to it. Not exactly dead on arrival, but pretty close to it 👎
 
I wish they would also care for better quality - reliability, durability - of their products. If you read product reviews on their own website you find early and even frequent fails quite often. It's nice that they are so honest to show also such reviews, but can't they learn from it and improve their products??? It's going on like this already since years.
 
They have better products, they only cost more, you get what you pay for.

Human mind is amazing, always wants to buy the cheapest and then feels angry when it turns out no good. Sorry, save up and get quality item instead. I've learned this years ago after buying crap many times, falling into the same trap too many times.

Think about it, and it is not just DSP amps but anything you consume from shoes to firewood. And it is ruining the planet, crap products get made and shipped around the world so that consumers can get what they want, cheap crap, in exchange for money to the greedy thank you. I've bought many items that ended up to trash bin straight from the box and I'm sad I did and even sadder these things exists at all..
 
Sorry tmuikku, my experience is different. I bought many cheap - some almost unbelievably cheap - products which performed well and lasted long (and some last even today, 40 years after purchase). Admittedly, I also had a couple early failures.

After a few such bad experiences I thought I should indeed buy more quality products, of well recognized "quality" brands. But my experience with them is similar - some last, others don't / didn't.

There simply is no guarantee that high price means high quality or long life. There are too many cheapo guys / companies out there who think that good marketing is the primary key to success, and manage to create the "quality" illusion that so many people fall for.