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Earthquake XJ-300ST Stereo Amplifier Review

bidn

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This class J means junk.

Absolutely right!

I assume this is why there is no poll (at least right now) at the top of the review : voting is not possible yet because the most relevant category for that device is still missing: Piece of junk.
 

vkvedam

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Either way it did create an earthquake one way or another with this kind of performance ;)
 

Doodski

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This review finally proves that not all amplifiers sound the same.
I think this is a outlier. I googled class J extensively and found limited details on it but what I found was not stated to be for audio use.
 

MinMan

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Unfortunately Earthquake may no longer be using ATI as their OEM....
 

sarumbear

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Specifications​

  • Power Output:
    • 2 X 110 WRMS (8-Ohm Stereo)
    • 2 x 170 WRMS (4-Ohm Stereo)
    • 170 WRMS @ 110 volt AC (8-Ohm Mono Bridged)
    • 210 WRMS @ 230 volt AC (8-Ohm Mono Bridged)
    • 320 W-IHF (dynamic power) @ 230 volt AC (4-Ohm Mono Bridged)
  • Frequency Response: 20Hz–20kHz
  • High Pass Filter: 15Hz
  • Phase Infinitely Variable: 0–180°
  • Crossover: 50Hz–160Hz
  • Signal To Noise: 101dB
  • Load Impedance: 2 Ohms or greater
  • THD: 0.08%
  • Damping Factor:> 1400
  • Power Line Voltage: 110-220 ~ AC50/60Hz
Unfortunately Earthquake may no longer be using ATI as their OEM....
Why? Have they been?
 

digicidal

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I think the fact that this isn't the worst measured amp so far speaks volumes (pun intended) about the competition. :confused:
 

Xyrium

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Ouch, agree on the waste of our planet's resources, and is also a good point. Damned shame...
 

ROOSKIE

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Another case for the pretty scrappily but reasonably decent for $100-130 Monoprice 605030, it smokes this amp.
 

dualazmak

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The company shall never be successful in Japan, active tectonism/diastrophism place...
 

newaudioguy77

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Looking at the frequency response roll off....

It kind of makes sense for them to call this thing the Earthquake XJ-300ST!!

High magnitude. Lots of damage. Audiophiles evacuated the premises.
 
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