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Rainbow Dream
Rainbow Dream 0.5K Mono 500W Class D Amplifier

Rainbow Dream 0.5K Mono 500W Class D Amplifier

Best price now

$89.99at Audio IntensityObserved at 4:01 AM
Deal: 78% off at Audio Intensity →

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Our take on the Rainbow Dream 0.5K Mono 500W Class D Amplifier

The Rainbow Dream 0.5K Mono is a single-channel Class D subwoofer amplifier rated at 170W RMS into 4 ohms, 310W into 2 ohms and 500W into 1 ohm. Its band-limited 20Hz–400Hz design and compact 155 x 55 x 165mm chassis suit tight installs behind or beside a small enclosure. Wide 0.25V–5V input sensitivity lets it work with weak factory head units or hot DSP outputs. At $89.99 at Audio Intensity as of November 3, 2026, it sits at the only price seen since November 1, 2026, so there is no cheaper point in its short recorded history.

Best forBudget subwoofer builds under 500WTight spaces behind a compact enclosureFactory head units with low preout voltageDrivers running 1-ohm or 2-ohm subwoofers
Pros
  • 500W RMS at 1 ohm for the money
  • Small 155 x 55 x 165mm footprint
  • Input sensitivity down to 0.25V suits weak factory preouts
  • 90dB signal to noise and THD under 0.02 percent on paper
  • Band-limited to 20Hz–400Hz, which is all a sub needs
Cons
  • Not full-range: unusable for door speakers or mains
  • No published damping factor or crossover slope
  • Single channel only, so one sub or a paralleled pair
  • Brand has little track record in car audio

Rainbow Dream 0.5K Mono 500W Class D Amplifier prices at every store

  • Audio IntensityNew

    In stock

    $89.99Observed at 4:01 AM
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Rainbow Dream 0.5K Mono 500W Class D Amplifier price history

$89.99$89.99
Nov 1Nov 3

Lowest price we've seen: $89.99 on Nov 1 at Audio Intensity. Tracked across 1 store since Nov 1.

From Audio Intensity

  • Single-channel Class D subwoofer amplifier
  • Compact 155 x 55 x 165mm chassis fits beside or behind a compact enclosure
  • 170W RMS at 4 Ohm, 310W at 2 Ohm, 500W RMS at 1 Ohm
  • 20Hz to 400Hz band-limited subwoofer amplifier, not full-range
  • Input sensitivity 0.25V to 5V suits weak factory preouts and hot DSP outputs
  • 90dB signal to noise, THD under 0.02 percent
Fit
Compact chassis 155 x 55 x 165mm; small enough to mount beside or behind a compact enclosure
Sizing
Pick the impedance that lands nearest the power the driver is rated for, not the one that gives the biggest number; running a 250W sub at 1 Ohm for 500W risks d
Care
Leave air around the heatsink; Class D runs cool, not cold, and a small chassis has less surface to shed heat from
Guarantee
No manufacturer warranty; discontinued model with no replacement pipeline
Returns
Final sale: no returns, no exchanges
Shipping
Free shipping to the lower 48; AK, HI and international quoted live at checkout

Specifications

Frequency Response
20Hz to 400Hz
Signal To Noise Ratio
90 dB
Total Harmonic Distortion
Less than 0.02 percent
Input Sensitivity
0.25V to 5V

Questions and answers

Is 500W at 1 ohm realistic for this amp?
The rating is 500W RMS at 1 ohm, with 310W at 2 ohm and 170W at 4 ohm. That assumes a stable 1-ohm load and solid electrical supply; expect less in real installs with voltage drop.
Can I use it to power door speakers?
No. It is band-limited to 20Hz–400Hz, so it will not reproduce vocals or highs. It is a subwoofer amplifier only.
Will it work with my factory radio?
Yes, if you can tap a speaker-level or preout signal. Input sensitivity from 0.25V to 5V covers weak factory preouts and hot DSP outputs.
How big is it and where can it fit?
The chassis measures 155 x 55 x 165mm, so it fits beside or behind a compact enclosure or in a spare-tire well.
Is $89.99 a good price?
It is the only new price recorded since November 1, 2026, and the lowest seen, so there is no cheaper point to wait for. Compare it against other 500W 1-ohm Class D amps before deciding.
What comes in the box?
The listing does not detail box contents. Expect the amplifier itself; check with the store about wiring, fuses and mounting hardware before ordering.
Where is the Rainbow Dream 0.5K Mono 500W Class D Amplifier cheapest?
At Audio Intensity, for $89.99, 78% off, as of our latest check.