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Amphion FlexBase25 Studio Bass Extension System Demo

Stereo Subwoofer System with 10" Woofers and 2-channel Power Amplifier, 700W/Channel at 4 Ohms
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Amphion FlexBase25 Studio Bass Extension System
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Elevate Your 2-way Monitors to a Full-range System

Amphion FlexBase25 transforms your stereo 2-way studio monitor setup into a full-range, 3-way system. FlexBase25 is a single-box, stereo bass system with two long-throw 10-inch low-frequency drivers and a separate LFE-channel input. Unlike the mono subs used for movie formats, this music-centric bass extension system maintains stereo information throughout the whole frequency range. FlexBase25 is driven by a 700-watt-per-channel FlexAmp1200 power amplifier, which includes a variable crossover frequency, bass level attenuation, and adjustable mono/stereo spread. FlexBase25 also improves your existing studio monitors' power handling. If you want to outfit your studio with hyper-accurate, full-range monitoring, Amphion FlexBase25 is primed to address the needs of modern sound making.

Stereo to the lowest octave

Rather than reproducing low-frequency content in mono, FlexBase25 retains stereo information all the way down to the lowest octave. This system delivers a 20–260Hz (lowpass), 35Hz–200kHz (highpass) frequency range via two long-throw 10-inch woofers, with a maximum SPL of 117dB. If you demand the utmost in monitoring accuracy, FlexBase25 is tailor-made for you.

1,400 watts of clean power

Amphion FlexBase25 is driven by a FlexAmp1200, which is a 1,400-watt, 700-watt-per-channel power amplifier. This impressive unit exhibits outstanding THD and noise specs, along with a generous 127dB dynamic range. Here at Sweetwater, we've found that this system is replete with features, including bypass for occasions where you need a narrower midrange view, adjustable mono/stereo spread, and a separate LFE-channel input with +10dB sensitivity compared to the main channels, but no built-in lowpass filtering.

Seamless integration

FlexBase25 makes incorporating it into your studio monitor setup easy and seamless. Not only that, as low frequencies are transferred to the FlexBase25, the midrange clarity and power handling of the paired studio monitors are greatly enhanced. You also get a variable crossover frequency and bass level attenuation to allow the system to match the specific needs of various sound engineering tasks.

Amphion FlexBase25 Studio Bass Extension System Features:

  • Transforms your stereo 2-way studio monitor setup into a full-range, 3-way system
  • Single-box, stereo bass system with 2 long-throw 10-inch low-frequency drivers
  • Ultra-efficient 1,400-watt, 700-watt-per-channel power amplifier
  • Separate LFE-channel input with +10dB sensitivity compared to the main channels, but no built-in lowpass filtering
  • Retains stereo information all the way down to the lowest octave
  • Delivers a 20–260Hz (lowpass), 35Hz–200kHz (highpass) frequency range and a maximum SPL of 117dB
  • Exhibits impressive THD and noise specs and a generous 127dB dynamic range
  • Bypass for occasions where you need a narrower midrange view
  • Adjustable mono/stereo spread ensures lock-tight integration even with higher crossover points
  • Variable crossover frequency and bass level attenuation

What is Demo Gear?

At Sweetwater, we're so picky that what we call a "demo" is actually better than what most music retailers sell as "new" gear! Our gear hasn't endured hundreds of people a week plunking away at all the keyboards, fumbling through Stairway to Heaven on every guitar or playing with every fader and knob on a mixer or control surface.

What demo means to us is that we've had it out of the box, or maybe it was in a customer's hands for a few days and isn't "factory fresh" as a result. Every demo item we sell has Sweetwater's 2-year Total Confidence Coverage™ warranty, and has been tested and verified up to "new" specs by our factory-authorized technicians to make sure it's in perfect working order before we ship it to you.

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Warranty Info

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Tech Specs

  • Powered: Yes
  • Speaker Size: 10"
  • Driver Type: Aluminum Cone
  • Total Power : 700W
  • Frequency Range: 20 Hz - 260 Hz +/-3dB (low pass), 35 Hz - 200 kHz +/-3dB (high pass)
  • Crossover Frequency: Active 4th-order @ 35-260 Hz
  • Maximum Peak SPL: 117 dB SPL @ 1m
  • Input Types: 3 x XLR
  • Output Types: 3 x XLR, 1 x speakON
  • Other I/O: 1 x 1/4" (footswitch)
  • Enclosure Type: Sealed
  • Height: 33"
  • Width: 13.4"
  • Depth: 12.6"
  • Weight: 110 lbs.
  • Manufacturer Part Number: pro Flexbase25

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