Opinion on the Behringer KM1700 Class-H amp - diyAudio
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Old 26th January 2017, 07:41 PM   #1
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Default Opinion on the Behringer KM1700 Class-H amp

Hey everybody!

Since I just ordered a Behringer iNuke 3000DSP for my subwoofer, I thought I'd look at my options for an amplifier for my fronts. I stumbled across the KM1700 because I know that it's basically like Class A/B but with a variable and dynamic voltage rail. Correct me if I'm wrong!

They're slightly (and that's a mild expression) overpowered at 2x500w into 8Ohms. My speakers are barely 90 Watts RMS (if they're set as fullrange. They can take slightly more when not in fullrange, I suppose. Or less? Less movement is less cooling hmmmmm.)

Since I'm not very good with the specification-sheet reading, what would your opinion be? I can't actually find a specsheet.

Any input is greatly appreciated.

Cheers,
Anna

https://www.amazon.com/Behringer-KM1.../dp/B01MAY7S7W

[spoiler]
Behringer KM1700
limiter is switchable
front-to-back ventilation
frequency response: 20 Hz - 20 kHz (@-10 dB), 10 Hz - 80 kHz (@-3 dB)
THD: <0.03%
signal-to-noise: >100 dB
sensitivity: 0.77 V/26 dB/1.4 V (switchable)
dimensions: 482 x 375 x 88 mm (w*d*h)
weight: 12.5 kg
[/spoiler]

Last edited by HumbleDeer; 26th January 2017 at 07:43 PM.
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Old 26th January 2017, 10:57 PM   #2
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This looks like a very interesting amp to me, and I have mentioned this in another thread in the PA forum about it's little brother, the KM750.

The KM1700 reminds me of the EP2500. It's a class-H amp which, like you mentioned, is more like class AB than the class-D of the iNUKE series. It has two fans versus one on the EP2500 (I would do a fan mod if I bought one). The price is quite affordable at $199 for 500W/ch into 8R. While this might be "overkill" for your mains in terms of average power, it's not as overpowered as you might think for "peak power". You can think of it like a 100WPC amp with a good amount of headroom. This means your amp will not clip on peaks, unless you really listen to compressed music at very high levels. And yes, it does have the capability to fry your speakers, so don't play it too loud too long.
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Old 26th January 2017, 11:43 PM   #3
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Thanks for your extensive reply!

The amp states an RMS wattage that I said. Is that an overrated spec?

I'm always very cautious with power. I have never accidentally damaged a speaker and I wish to remain innocent

I like having a good headroom anyway to allow for taking it to a rig or upgrading to more powerful speakers. Even though I doubt I've ever pushed these speakers over 40-60watts as they're already painfully loud at that power level.

Cheers,
Anna
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Old 27th January 2017, 02:34 AM   #4
PRR is offline PRR  United States
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product sell-page

"front-to-back ventilation"

You realize this means it has a FAN ?

On some amps, the fan lays dead until the amp gets hot. Others run the fan on full all the time. Others vary the fan speed as needed. No details on the sell-page.

This is a low-price PA amp, for bands and DJs. In a crowded room the fan whirrr is not an issue. In a home listening room, it may be.

Why are you looking at THIS amp?

Yes, it is covered with buzz-words. G-mode, ATR. Some of these may even be good ideas. For somebody. But any good idea can be done wrong.

Rail tracking.... do you listen to the rails?? What it really means is they get more output with less heat (and money). OTOH this is more Watts for your bucks. On the third hand, IMHO this is an insane amount of Watts for most homes.

Knowing B-ringer, I am sure it meets all specs and reproduces music fine. B-ringer got where they are by making low-low-price stuff that does work OK.

At $200 for 1000-1700 Watts it is at the lower end of what Watts cost today. There are enough other amps at this $/Watt point that I don't think B-ringer has done it especially good or bad.

General gripes against B-ringer tend to be that the pots and jacks don't last forever especially in hard use (traveling band). In fixed home use it may last 10-20 years no problem.

If you really want a Thousand Watt Amplifier, this is a safe bet and about as low-price as you can find.

If the fan turns out to be disturbing, you can probably pawn it for half what you paid; near-new kilo-watt PA amps have good resale value.
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Old 27th January 2017, 06:11 AM   #5
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Quote:
Originally Posted by PRR View Post
product sell-page

"front-to-back ventilation"

You realize this means it has a FAN ?

On some amps, the fan lays dead until the amp gets hot. Others run the fan on full all the time. Others vary the fan speed as needed. No details on the sell-page.

This is a low-price PA amp, for bands and DJs. In a crowded room the fan whirrr is not an issue. In a home listening room, it may be.

Why are you looking at THIS amp?

Yes, it is covered with buzz-words. G-mode, ATR. Some of these may even be good ideas. For somebody. But any good idea can be done wrong.

Rail tracking.... do you listen to the rails?? What it really means is they get more output with less heat (and money). OTOH this is more Watts for your bucks. On the third hand, IMHO this is an insane amount of Watts for most homes.

Knowing B-ringer, I am sure it meets all specs and reproduces music fine. B-ringer got where they are by making low-low-price stuff that does work OK.

At $200 for 1000-1700 Watts it is at the lower end of what Watts cost today. There are enough other amps at this $/Watt point that I don't think B-ringer has done it especially good or bad.

General gripes against B-ringer tend to be that the pots and jacks don't last forever especially in hard use (traveling band). In fixed home use it may last 10-20 years no problem.

If you really want a Thousand Watt Amplifier, this is a safe bet and about as low-price as you can find.

If the fan turns out to be disturbing, you can probably pawn it for half what you paid; near-new kilo-watt PA amps have good resale value.

I know these have a fan, yup! I have near dead silent fans laying around that I can put I'm, but they'll be behind the other wall anyway

I'm not per she interested because of the power input. Rather because no matter how cheap I go on Beringer, it'll be better than Logitech.

I have a 30day full refund warranty at the shop I'm buying my materials.


Perhaps I'm cheap because I'm not old enough, but for now cheap is fine.

Thanks for your reply, PRR.

Cheers,
Anna
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