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Compact grey desktop headphone amplifier with front volume knob and quarter-inch jack

Monoprice Inc.

Monoprice Monolith Liquid Spark Headphone Amplifier 133304

SKU CH-6838-SW65T

Compact headphone amplifier delivering 1300 mW into 50 ohms with dual 18 V rails, switchable gain and RCA preamp outputs

  • Product typeHeadphones
  • Product colorGray
  • Product weight1.99
  • Key featuresHeadphone Output : Unbalanced stereo 1/4 in TRS jack
  • DC-coupled signal path keeps audio pure from input to output
  • 1300 mW RMS into 50 Ω loads drives demanding headphones with authority
  • Dual 18 V filtered power rails deliver wide voltage swing and extra headroom
  • Switchable gain lets you match sensitivity for low-noise listening
  • 108 dB signal-to-noise ratio preserves detail at any volume

Compact Desktop Headphone Amplifier

The Monolith Liquid Spark is a compact headphone amplifier designed by Alex Cavalli for Monoprice. It uses dual 18 V filtered power supply rails to produce wide voltage swings and additional headroom. The unit delivers 1300 mW RMS into a 50 ohm load with very low distortion. A DC-coupled topology removes capacitors from the signal path.

Desktop Listeners Seeking Clean Power

This amplifier suits listeners who want a small desktop device with switchable gain and a preamp output for powered speakers. It fits systems using an unbalanced stereo 1/4 inch TRS headphone connection and RCA inputs. Buyers needing balanced XLR connections or wireless streaming should look at other products.

RCA Preamp Output Adds Speaker Integration

The rear-panel RCA preamp outputs are controlled by the front volume potentiometer. This allows the same unit to drive headphones and feed powered speakers without a separate preamp. The package includes the amplifier and its power supply only; no headphones or interconnect cables are bundled.

How it compares

Measured against everything we stock in Earbuds & Over-Ear Headphones, at today’s prices. Recalculated every night.

Price $94.99
Pricier than about 84% of the 7,078 comparable items (median $25.99).

Specifications

Product
Brand nameMonoprice
Model name133304
Part number133304
Product typeHeadphones
Product colorGray

Questions about this item

Do I need a source with RCA outputs to connect the Liquid Spark?

Yes, the amplifier accepts line-level signals through its RCA inputs, so your source must provide an RCA output or an adapter to RCA.

Will my 50 ohm headphones receive enough power from the 1.3 W rating?

The amp delivers 1300 mW RMS into 50 ohms per channel, giving ample headroom for 50 ohm headphones.

How can I confirm the unit is operating correctly after I connect it?

With the gain switch set appropriately, you should hear clean, distortion-free audio at normal listening levels and the volume control should adjust output smoothly.

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