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ISP Technologies Stealth Ultra Lite

Guitar Amplifier Head
ISP Technologies
(1)

The STEALTH ULTRA-LITE provides 180 watts Peak, 90 watts RMS output power into a 4 ohm load. The STEALTH ULTRA-LITE™ is based on ISP Technologies patented Dynamic Adaptive Amplifier Technology and delivers nearly 60 volts peak to peak output signal swing from a 19 volt DC power supply by use of stored energy. The built in preamp is designed to allow instrument level pedals to directly drive the STEALTH ULTA-LITE to maximum output level plus you have the added tone shaping capability of +/- 10dB bass and treble control providing up to 47db of composite signal gain. The flexibility of the STEALTH ULTRA-LITE built in preamp also allows direct interface with professional +4dB rack mount signal levels. The STEALTH ULTRA-LITE™ offers efficiency close to that of a Class D amplifier but has the great tone and overdrive clipping characteristics of a Class A/B analog power amplifier. The STEALTH ULTRA-LITE™ weighs less than one pound, but packs the performance of a true 90 watt guitar preamp / power amplifier all in a package size of 1.73 inches tall by 4 inches deep and only 4.9 inches wide. Drop the STEALTH ULTRA-LITE™ on your pedal board and end up with a true compact rig with enough power to play with a drummer on stage. The STEALTH ULTRA-LITE™ will deliver a true 90 watts RMS 180 watts peak into a 4 ohm load (60 watts RMS 120 watt peak into 8 ohms) and comes with a universal switch-mode power adapter that will operate on any line voltage between 100 and 240 volts worldwide. Tour with confidence knowing that the STEALTH ULTRA-LITE™ will operate anywhere in the world, on any AC mains, with the included universal power supply. ISP has also designed in Pop free operation with protection against shorts, open circuits and thermal runaway.

  • Input Impedance: 470k
  • Output Power:
  • 4Ω @ 10% THD = 180WPEAK = 90WRMS
  • 4Ω @ 1% THD = 160WPEAK = 80WRMS
  • 8Ω @ 10% THD = 120WPEAK = 60WRMS
  • 8Ω @ 1% THD = 100WPEAK= 50WRMS
  • 16Ω @ 10% THD = 62PEAK = 31WRMS
  • Input Sensitivity/Max Output: -10dBu / .25vrms
  • Maximum Input Signal: +17dBu
  • Voltage Gain: 42dB
  • Noise Floor: -80dBu
  • Dynamic Range: 104db A WTD
  • Distortion: @10dBu output=.02% Full Output=.1%
  • Frequency Response: 20Hz – 20KHz = +0 / -.5dB
  • Input Power: 80mA @idle 3A full power @4Ω
  • Dimensions: 4.9” W x 1.75” H x 4” D
  • Weight: .95 LBS
  • Protection: Auto shutdown / Output shorts or low load impedance. Protected for open loads.
  • Note: 0dbu = .775 vrms

General Information
Manufacturer information
MusiX GmbH
Schildgasse 12
79618 Rheinfelden (Baden)
Germany

manufacturerinfo@musix.com
Product Warranty
Years
3
Product Details
Product Number
212715
Brand
ISP Technologies
Category
Guitar Amplifier Head
Brand Category
ISP Technologies - Heads
Relevancy rank in Category Guitar Amplifier Head
172 of 220
Date
June 2025
Dimension
Weight
0.4kg
Gross Weight
1kg

5
(1)

In my search for a weight-reduced alternative to my 100W tube amp (Metropoulos Metroplex), I purchased a ToneX One Modeler a few months ago. This allowed me to create captures of my beloved Metroplex, which are indistinguishable from the original on my computer. In my search for a pedalboard amp, I tried several well-known products, but none satisfied me. That's when I bought the ISP Stealth Ultra-Lite. I am completely satisfied with it. When comparing the Metroplex with the ToneX One/ISP Stealth, there is no discernible difference. The feel is exactly what you would expect from a tube amp – but with significantly lower volume levels. Last week, I used the ToneX One/ISP Stealth for the first time at a gig, and they performed flawlessly. I'm so impressed that I've already ordered a second ISP Stealth as a backup. If you can accept that the ISP Stealth doesn't have a power switch and that there's a crackling sound from the speakers when the entire pedalboard is turned off, and that the ToneX One loses power, I can highly recommend the ISP Stealth. Thank you, MusiX, for offering niche products that none of your competitors seem to have on their radar.

Operation
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