We here at Steamco have used the Stewart World Series Amplifiers for years and found them to be without peer both sonically and in reliability.

world series amplifiers
World Series Amplifiers are a favorite of professional bass players, they are very light, loud and sound beautiful, especially when paired up with an all tube pre-amp. The World Series Amplifiers offer an exceptional product line for all types of professional applications and are designed specifically for the unique requirements of high quality commercial, industrial, and pro-audio sound installations.

What does this mean to you as a bass player?

• Reliability, Flexibility:
  The World 1.6/2.1 are true Dual Monaural Amplifiers. Each chassis contains two independent amplifiers, each with it's own power supply, sharing only the AC power cord and cooling fan. Under normal operating conditions, this design provides maximum separation and greater dynamic capabilities that two amplifiers which share a single power supply. In addition, if a fault condition shuts down one channel, the remaining channel continues to operate unaffected.
  
  
• Reduced Weight, Increased Performance:
  The Stewart High Frequency Switch Mode Power Supply dramatically reduces overall weight. At the same time, it fully recharges 120,000 times per second (1000 times faster than conventional analog supplies), requiring far less capacitance for filtering and storage. This high-speed recharging reduces power supply "sagging" common with other designs resulting in unmatched low frequency performance.
  
  
• Unlimited Dynamics:
  Most power amplifiers utilize some form of current limiting in the audio path. While a fairly reliable form of protection, this technique has some disadvantages in that it can reduce the impact of musical transients by prematurely limiting output current and therefore dynamics. Low-frequency signals may sound weak or distorted as a result. Stewart Audio Inc. World 1.6/2.1 120Volt amplifiers have no current limiting in the audio path, and therefore reproduce the full dynamics of the audio signal.
  
  
• Absolute Protection:
  Stewart Audio Inc. power amplifiers employ circuits which fully protect the amplifier while avoiding any sonic compromises. First, a unique circuit monitors the current draw from the power supply. The amplifier's output is not affected in any way until the load impedance drops below 1/2 ohm, indicating the presence of a short. Under these conditions the power supply will simply shut down until the short is removed, at which point the power supply will slowly ramp up to full power, protecting the load from a surge of high power. The first line of defense against excessive heat is a variable speed cooling fan. This variable speed fan will engage upon power-up and run quietly the entire time the amplifier is in use. If for any reason the amplifier should overheat, an additional safety feature is provided in the form of a thermostat, which will shut the amplifier down, if the heatsink temperature reaches 85°C.
  
  

world 600

600W @ 4 ohms bridged
190W × 2 @ 4 ohms stereo
only 10 lbs!!

world 1.2

Two Channel Amplifier
Optimized to drive 4 Ohm and 8 Ohm loads.
Convection Cooled (No Fans)
Clean Full-Range Dynamic Power
World Class Reliability
Bridgeable
Ultra Efficient Switch Mode Power Supply
3 Years Parts and Labor Warranty
1200W @ 4 ohms bridged
350W × 2 @ 4 ohms stereo
only 11 lbs!!

world 1.6

Two Channel Dual Monaural Amplifier
Optimized to drive 4 Ohm and 8 Ohm loads.
Variable Speed Fan Cooled
Clean Full-Range Dynamic Power
World Class Reliability
Bridgeable
Ultra Efficient Switch Mode Power Supply
3 Years Parts and Labor Warranty
1600W @ 4 ohms bridged
550W × 2 @ 4 ohms stereo
only 16 lbs!!

world 2.1

Two Channel Dual Monaural Amplifier
Optimized to drive 4 Ohm and 8 Ohm loads
Variable Speed Fan Cooled
Clean Full-Range Dynamic Power
World Class Reliability
Bridgeable
Ultra Efficient Switch Mode Power Supply
3 Years Parts and Labor Warranty
2100W @ 4 ohms bridged
650W × 2 @ 4 ohms stereo
only 17 lbs!!

pa-50b

Compact Half Rack Package
Two Channel Amplifier
Optimized to drive 4 Ohm and 8 Ohm loads.
Convection Cooled (No Fans)
Clean Full-Range Dynamic Power
World Class Reliability
Bridgeable
Ultra Efficient Switch Mode Power Supply
2 Years Parts and Labor Warranty 100W @ 8 ohms bridged
50W × 2 @ 4 ohms stereo
only 3.5 lbs!!
Rack mount kits available

pa-100b

Compact Half Rack Package
Two Channel Amplifier
Optimized to drive 4 Ohm and 8 Ohm loads.
Convection Cooled (No Fans)
Clean Full-Range Dynamic Power
World Class Reliability
Bridgeable
Ultra Efficient Switch Mode Power Supply
2 Years Parts and Labor Warranty
180W @ 8 ohms bridged
90W × 2 @ 4 ohms stereo
only 5.5 lbs!!
Rack mount kits available

Additional specs and downloadable manuals for all products can be found at: www.stewartaudio.com/specSheets.html.

Please contact us for Canadian price quotes.