Hi all,
Just a quick review of the ADMARK AD42 amplifier, which can be found from Alibaba
I am always skeptical of amps from Alibaba, you really dont know what you get. But honestly, this one surprised me a decent amount.
My test setup consists of 4x 8 ohm 1000w, wired 2 in series and 2 paralelle to maintain 8 ohm.
Measured voltage: 146 v on volt meter
Measured Vrms: 155 v on oscilloscope
Converted wattage: 3000-3200w 8 ohm
I was unable to test bridge mode.
There is a 10ms peak or so, that goes above this, but I wasn't able to capture it. Its so quick it will likely not be audible before falling to rms voltage above.
Notes: This is with the peak light off, it quickly falls apart at above this voltage. The peaking is not very pretty and will destroy your speakers instantly, do not overload this amplifier.
Official specs
Just a quick review of the ADMARK AD42 amplifier, which can be found from Alibaba
I am always skeptical of amps from Alibaba, you really dont know what you get. But honestly, this one surprised me a decent amount.
My test setup consists of 4x 8 ohm 1000w, wired 2 in series and 2 paralelle to maintain 8 ohm.
Measured voltage: 146 v on volt meter
Measured Vrms: 155 v on oscilloscope
Converted wattage: 3000-3200w 8 ohm
I was unable to test bridge mode.
There is a 10ms peak or so, that goes above this, but I wasn't able to capture it. Its so quick it will likely not be audible before falling to rms voltage above.
Notes: This is with the peak light off, it quickly falls apart at above this voltage. The peaking is not very pretty and will destroy your speakers instantly, do not overload this amplifier.
Official specs
I literally just bought one of these, couldn't find anything local that was a reasonable price! Guess it's going to be a little interesting to use, initially will be powering 1x b&c tbw100 1500w 8ohm per channel but looking to ideally power all 4 of our cabs so 2 per channel at 4ohm. You reckon this amps actually going to be upto the job? Does it exhibit the peaking under any other conditions than sending a clipped signal into it?
I think you can easily power 2x in paralelle at 1500w, on both channels without worry.
I got 2x 1500w RMS woofers I wanna test when it stops raining (from denmark) to see how it handles those, will report back.
I got 2x 1500w RMS woofers I wanna test when it stops raining (from denmark) to see how it handles those, will report back.
Ok so with that in mind, if I have the peak limiters set to 6000w @ 4ohm which equates to about 154v per channel, but set them at say 149v would that potentially avoid the issue with the clipping? Also, running this voltage under load, do you have any idea how many amps the unit is roughly drawing? The club I run at has a 32amp supply and the unit will be run off of a 32amp plug via our pdu
Yeah, I think setting a limiter or at least limiting the mixer and setting the output of the amp to roughly 149v should be fine. Then you're certain you will never clip it. I didn't check the input amp, but at peak it should draw 20A ish, so you're set. Also its important to note that RMS draw is probably lower, more like 16A ish.
First gig I only ran 2 keystones off of it but the difference in sound quality and warmth in the bass is crazy. Temperature readout was a solid 43 degrees Celsius after 7 hours in a sweaty gig so it's warm up gig was definitely a success. Will look into upgrading the backs of the subs so I can link them and run all 4 off of it at the next gig!
The clip waveform wouldn't be a disaster for a large sub-woofer... but best to avoid it if possible. @justMitas do you have a way of measuring the line current under load?
Sorry, but I dont currently have a clamp meter. But I was using a small cable and it almost melted at max. So I would assume 20A is close to it.
Hey there,
I have just purchased one of these AD42 amplifiers and am running the same set up as @watafu with two keystones and the same b&c tbw100 drivers. I am trying to work out limiting for this system and am getting a bit confused with the voltage element. Am I right that I scale all elements based off of balanced line voltage signal? If I were to send a maximum line level signal that, for this example, was 1volt and the Amplifier that received the signal put out 3000w at max level then I could scale down and limit my output to half db, sending 0.5v and then halving the amplifier output? Sorry if this is a noob question/idea!! Would really appreciate some help🙂
I have just purchased one of these AD42 amplifiers and am running the same set up as @watafu with two keystones and the same b&c tbw100 drivers. I am trying to work out limiting for this system and am getting a bit confused with the voltage element. Am I right that I scale all elements based off of balanced line voltage signal? If I were to send a maximum line level signal that, for this example, was 1volt and the Amplifier that received the signal put out 3000w at max level then I could scale down and limit my output to half db, sending 0.5v and then halving the amplifier output? Sorry if this is a noob question/idea!! Would really appreciate some help🙂
Personally I just set the mixer and amps to max, with the level of the tops set to my maximum desired on the input gain into the processor. Prior to this it's worth getting a rough idea of what ratio of subs to tops you want on lower volumes. Then Max it all out on amps and mixer.That way you have something to use as a guage. Then unplug your subwoofers and plug in a voltmeter. From there I would then bring the limiter down until it reaches the desired max voltage according to welters spec which I won't quote but is easily searchable. Then the RMS brings it down again to I believe around 88volts.
I try not to do it the mathy way as it's too confusing!!
I try not to do it the mathy way as it's too confusing!!