Polytone amps have been around for almost 40 years now. Ask any Jazz guitar or bass player and they will tell you how they like their Polytones: warm and detailed sound, flexible repamp and ease of transport are some of its best appreciated specs.
The single 15" extends nicely (and surprisingly) to the high frequencies, in a more natural way than most tweeters do.
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Here are some more specs:
  
NEW POLYTONE SONIC BASS II
  
  
 The Sonic Bass replaces the Mini-Brute III with a new dimension. Ch 2 SONIC CIRCUIT gives added warmth and richness. With Gain, Contour and Bass Drive endless varity of timbres can be achieved.
  
  
 140 watts RMS
  
  
 Active bass, mid, Treble controls.
  
  
 Master Volume
  
  
 Ch 1 - Normal / Ch 2 SONIC CIRCUIT
  
  
 3 potentiometers - Gain, Contour, Bass Drive
  
  
 Jacks for Preamp Signal Out Ext. Spkr. & Headphones
  
  
 Effects Loop
  
  
 Heavy Duty 15" speaker
  
  
 Tough black textured covering & steel mesh grill
  
  
 Sonic Bass II
  
  
 NEW MODEL
  
  
 This newest State of the Art model is the EPITOME of perfection.
  
  
 Sonic Network - featuring 3 different voicings.
  
  
 Sonic Bass is like having 2 separate amplifiers in one.
  
  
 Heavy duty 15" speaker
  
  
 Dimensions: 20 1/2" H x 18" W x 12" D
  
  
  



