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Got these 2 amps on ebay for $110 shipped & in mint condition. Remember, these old MTX amps are way underrated in the power department. the 2150x could easily pushing way over 450rms @ 14.4v & the 275x is around 350rms.


Thunder2150x Amplifier


18dB/octave, continuously variable crossover with reverse outputs. For example, when you have the crossover set to low-pass, you have a high-pass output. This makes it much easier to connect multi-amplifer systems.
Symmetrical power-supply distributes the heat evenly across the amplifier. This makes it more reliable (meaning, it plays louder).
External Bass Control (EBC) port lets you adjust the bass from your seat with the optional EBC unit.
Individual Gain Controls to center up the soundstage.
Giant MOSFETS (we're not exaggerating - they're huge). A larger MOSFET means power supply stability, and a more reliable product.
8 Volt RMS Input - This large signal capability allows for better integration with high voltage output source units, increased dynamic range, and better Signal-to-Noise ratio in the audio system.
Continuously Adjustable Thunder EQ bass boost, centered at 40Hz. To severely boost the low-end, and the attention you get from other drivers and innocent bystanders.
Unique Split Shield bottom plate design, reduces electromagnetic interference, to improve signal-to-noise ratio and reduce distortion. This design is so hot, we patented it so others can't leech off our genius. (Patent # 5,521,792)
ISO-FEET TM nylon mounting feet, eliminate the possibility of chassis-to-chassis ground noise. Leeches beware, this one's patented too. (Patent # 5,521,792).
RMS Power measured at 12.5 Volts DC:
75 Watts x 2 into a 4 Ohm load with less than 0.05% THD+N
150 Watts x 2 into a 2 Ohm load with less than 0.1% THD+N
300 Watts bridged into a 4 Ohm load with less than 0.1% THD+N

Dynamic Power (IHF-202 Std) measured at 14.4 Volts DC
120 Watts x 2 into a 4 Ohm load
212 Watts x 2 into a 2 Ohm load
425 Watts bridged into a 4 Ohm load

Signal to Noise Ratio:
> or = 110dB A-Weighted

Damping Factor:
>200
Frequency Response:
20Hz-20kHz±0.25dB

Thunder EQ:
Variable Bass Boost (0-18dB) centered at 40Hz

Crossover:
Variable 50Hz to 200Hz, 18dB/Octave, High Pass or Low Pass Configurable

Dimensions:
9" x 9" x 2" (22.9cm x 22.8cm x 5cm)
10-1/4" x 9" x 2" (26cm x 22.8cm x 5cm) Including IsoFeet(TM)



and
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Thunder275x Amplifier


18dB/octave, continuously variable crossover with reverse outputs. For example, when you have the crossover set to low-pass, you have a high-pass output. This makes it much easier to connect multi-amplifer systems.
Individual Gain Controls to center up the soundstage.
Giant MOSFETS (we're not exaggerating - they're huge). A larger MOSFET means power supply stability, and a more reliable product.
8 Volt RMS Input - This large signal capability allows for better integration with high voltage output source units, increased dynamic range, and better Signal-to-Noise ratio in the audio system.
Continuously Adjustable Thunder EQ bass boost, centered at 40Hz. To severely boost the low-end, and the attention you get from other drivers and innocent bystanders.
Unique Split Shield bottom plate design, reduces electromagnetic interference, to improve signal-to-noise ratio and reduce distortion. This design is so hot, we patented it so others can't leech off our genius. (Patent # 5,521,792)
ISO-FEET TM nylon mounting feet, eliminate the possibility of chassis-to-chassis ground noise. Leeches beware, this one's patented too.
RMS Power measured at 12.5 Volts DC:
37.5 Watts x 2 into a 4 Ohm load with less than 0.05% Thd+N
75 Watts x 2 into a 2 Ohm load with less than 0.1% Thd+N
150 Watts bridged into a 4 Ohm load with less than 0.1% Thd+N

Dynamic Power (IHF-202 Std) measured at 14.4 Volts DC
85 Watts x 2 into a 4 Ohm load
140 Watts x 2 into a 2 Ohm load
280 Watts bridged into a 4 Ohm load

Signal to Noise Ratio:
> or = 110dB A-Weighted

Damping Factor:
>200

Frequency Response:
20Hz-20kHz±0.25dB

Thunder EQ:
Variable Bass Boost (0-18dB) centered at 40Hz

Crossover:
Variable 50Hz to 200Hz, 18dB/Octave, High Pass or Low Pass Configurable

Dimensions
8" x 9" x 2" (20.3cm x 22.8cm x 5cm)
9-1/4" x 9" x 2" (23.5cm x 22.8cm x 5cm) Including IsoFeet(TM)
 

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HKS Twins
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432 Posts
i use to install these amps for circuit city and yes they are really under rated. One amp will power the shit out of most subs. Great steal!
 
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