Non ADA Gear > Amps
Koch ATR-4502 Power Amp
Kim:
--- Quote from: rabidgerry on April 29, 2018, 06:38:50 AM ---Oh I know, I'm just curious to see if this 90watt hybrid is as loud as a SS 300watt amp. That's my bench mark currently so I need the same or me for me to make it work with my rack gear.
--- End quote ---
There's two things to also consider here.
The perceived volume is not linear with wattage ratings.
If you compare the maximum volume of say a 50 watt amp with a 100 watt amp, the difference is only going to be 3 dB....not much of a difference. It would take an amplifier with 10 times more power to be perceived as being twice as loud; a 10 dB increase. It'll take 500 watts to sound twice as loud as 50 watts. :o
A "hybrid" amp is...... still a Solid State amp.
There's a tube or two attempting to add some "warmth" of the soft-clipping even-order harmonic distortion, but the final link to the speakers is still within the S.S. realm with transistors, Mosfets, etc. Comparing the 90 watt hybrid to the 300 watt SS amp is comparing two Solid State poweramps. Apples = apples.
Having put that out there now, if the 90 watt amp fits your travel weight requirements, then IMO it should do the job. 3-4 dB difference shouldn't be the deciding factor here. And since the price might be perfect (free endorsement?) if the deal is made....well if I were in your shoes I'd just say "Yes please". :)
rabidgerry:
Hmm I'm not convinced now a 90watt hybrid amp could provide the right amount of volume.
I had a crate power block before which was 150watts SS and it wasn't loud enough. I needed two of them to compete with our drummer. Then I had enough and little more in the tank should I need it. I have a 400watt SS amp, does the job and with some to spare and then also the Roctron 300watt amps and they roughly work out similar performance to the 400watt amp, so I'm not convinced 90 can cut it.
It wont be free either, but some kind of discount deal as they're too small a company (their words not mine).
I'll have to ask them how does their amp stack up to tube amp volume then and see what they say.
No point in buying something that will not be of use to me. What I was hoping for was a lighter and potentially even better sounding amp than the Velocity. I love the Velocity, it's great.
rnolan:
Hey RG, seems it's much like the ADA MT100 but modern :dunno: . I had a MT100 briefly, I found it under powered and wasn't keen on the tone, to be fair it didn't last long before I swapped it..
I've been using a Carvin DCM200L in my rack for a while now, plenty to get over the drummer and sounds quite good. It's not class D (many Carvin amps are) which I prefer. Class D adds yet another transduction layer (similar in concept (albeit works quite differently (pulse trains)) to sampling analogue signals into digital and back again, hence transduction (is that a word ?).
Can you try it and send it back if it isn't right for you ? Basically I recon you have to hear it.
From Wikipedia
A class-D amplifier or switching amplifier is an electronic amplifier in which the amplifying devices (transistors, usually MOSFETs) operate as electronic switches, and not as linear gain devices as in other amplifiers. They are rapidly switching back and forth between the supply rails, being fed by a modulator using pulse width, pulse density, or related techniques to encode the audio input into a pulse train. The audio escapes through a simple low-pass filter into the loudspeaker. The high-frequency pulses, which can be as high as 6 MHz, are blocked. Since the pairs of output transistors are never conducting at the same time, there is no other path for current flow apart from the low-pass filter/loudspeaker. For this reason, efficiency can exceed 90%.
rabidgerry:
Interesting, didn't realise ADA MT100 was a hybrid, I thought it was all tube. What didn't you like about the influence of that amp on your tone? Just curious.
Doubt it's like this Koch amp. But the under powered is the big issue here (providing it sounds good). I doubt will be able to try before I buy to be honest.
I think my Harley Benton 400watt power amp is class D. Light and Loud and Cheap.
MarshallJMP:
ADA does have a 2 x 50W full tube rack amp called the T100S and it weights about 12kg in a 2U rack housing. Mine puts out around 75W per side.
But I can agree that an MT100 is not loud at all, especially compared to a tube amp. Sound wise they are not so bad at all IMO.
I do agree with Gerry that maybe that Koch amp won't be loud enough.
@R, a class D amp is NOT digital actually. There is no AD or DA converter in it. PWM is made when you compare the original signal with a triangle wave, this will output PWM signals which are then amplified by MosFet's (due to their low Rds on resistance) and at the output they just filter out the high frequency's with a low pass filter restoring the original signal. And due to the fact they can get an efficiency of 90%+ they can use smaller (switching) power supplies and less cooling, so they are lighter then other power amps.
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