Palmer Macht 402

19" Stereo Power Amplifier

  • Especially for electric guitar
  • Output Power: 2 x 200 W @ 4 Ohm, 2x 100W bridged @ 8 Ohm: 1x 400W @ 8 Ohm
  • Class D dynamic circuit
  • Frequency range: 20 - 20,000 Hz
  • Protection: soft start, short-circuit, DC, overheating, overvoltage
  • Controls: on/ off, volume, high, low, mode (bridge/ parallel/ stereo), ground lift, limiter sensitivity
  • Line input: 2x XLR and 2x 6.3 mm jack
  • Speaker output: 2x speaker twist and 3x 6.3 mm jack
  • Dimensions (W x H x D): 482 x 44 x 244 mm

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Great 2-Channel (A/B), Class-D Amplifier

soulrebelno1, 15.01.2016
I've been using this amp for a few days now and I'm very impressed with it. I had looked at purchasing the Harley Benton GPA-400 but decide on this one as it has a lot more features included and seems to be of a better quality. Palmer is part of the Adam Hall group. Compared to the Harley Benton GPA-400, it has more output options for a start: 2 x Speakon and 3 x 6.3mm (1/4") jacks. Inputs: 2 x balanced 1/4" TRS and 2 x balanced XLR line inputs for channels A and B. It also has very good built-in circuit protection: over-voltage; overheating; short-circuit; soft-start and DC. Switching power supply. Operating voltage is switchable: 230v or 115v, AC. Always check the voltage setting before turning a device on for the first time. I once had a power supply blow-up because the voltage switch was supplied with the switch in the wrong position: 110v instead of 240v. I didn't check before switching it on - bang! An expensive mistake, one very dead power supply. It has more output power modes than the Harley Benton GPA-400, as well: 2 x 200w@4ohms; 2 x 100w@8ohms; 2 x 50w@16ohms. In bridge mode: 1 x 400w@8ohms; 1 x 200w@16ohms (mono).

FRONT CONTROLS:
On/off; volume; treble and bass controls (sometimes call resonance and presence). Rumble filters: low frequency lock at 40Hz for channels A and B which are independent of each other.

FRONT LEDS:
Power, signal, clip, protect, Output Mode: bridge/parallel).

REAR CONTROLS:
Ground lift: eliminate ground loop hum. Clip limiter: output set to maximum possible level. Output mode: bridge, stereo or parallel. Adjustable input sensitivity: Hi (-10 dbu/240 mv); Mid (-2 dbu/610 mv) and Low (+4 dbu/1.23 v).

CLASS-D AMPLIFIER
This is a class-D amplifier, and therefore, is very efficient. The theoretical power efficiency of a class-D amplifier is 100%! But, real-world power MOSFETs are not ideal switches, but practical efficiencies well over 90% are common. If you don't know the difference, by contrast, linear AB-class amplifiers are always operated with both current flowing through and voltage standing across the power devices. An ideal class-B amplifier has a theoretical maximum efficiency of 78%. Class A amplifiers (purely linear, with the devices always "on") have a theoretical maximum efficiency of 50% and some versions have efficiencies below 20%. The power consumption of this amp at full power is 820 watts. It also weighs in at 3.8kg which is very good.

I have connected my rack version of the brilliant Kemper Profiler Amplifier (KPA) to the Palmer Macht 402. The amp then powers two Line 6 DT25, 1x12 extension cabinets. The cabs are designed by Reinhold Bogner and use 12" custom Celestion G12H-90, 8 ohm speakers. They sound great and have lots of bass because of the close-back design. It's my dream set-up at the moment, until something else comes out ;-) It's loud and it's got more than enough oomph, 200 watts to be precise! And, it all comes in full glorious stereo, so modulation and delay effects sound fantastic.

CONCLUSION
Overall, I'm very happy with this amp and for the price it a bargain. It looks and feels like a quality unit, it's got no valves so I hope it's (very) reliable, I can't tell yet as I haven't had it that long, but it comes with a 3-year Thomann guarantee, highly recommended.
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Total
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Perfect budget unit.

Perso, 22.04.2018
So either was this or HB GPA.
I got this and what can I say. It`s a really great unit.
I use it with GSP1101 and 70/80 Blackstar cab. It works like magic. I mainly use Bridge mode with only volume without Lows and highs beacons of the cab. If you have let`s say a Marshall or Engl preamp then the Lows and Highs can be useful. If you have a unit like GPS then you just turn those off, because if you switch a lot of those preamp sims. You ruin the sound.
Quality is great. I use this for over a year and I didn't`t find any faulty on it. Sound is the same as the first day I got it out of the box. It has wide area of use with all features that are provided with this unit.I really like the auto stand by mode, I jump all around and some times I forget to turn it off so that's a + for me(can be turned off on the back).
Overall a great unit that will not let you down.
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