Wheel Fi


System Small


The centerpiece of our System Small is the midrange horn.  This horn covers six of the ten octaves that we hear, a wide range that ensures the coherence of the musical event.

The amplification is tailored to work in harmony with the speaker, as in all of our systems.  Power is provided from a rare and beautiful vintage French triode vacuum tube, the R120. The R120 is used in a single-ended configuration to keep the delicate waveform intact while simultaneously allowing the System Small to develop sound pressure levels beyond 110dB with very low distortion.


Amplifier Small    
    Horn amplification                
            Two channels (left and right, midrange and up)
            Two amplification stages only        
            All triode (R120)        
            Transformer-coupled between stages        
            Transformer-coupled output        
            Bandwidth-limited to match dedicated horn (removes speaker level crossover parts)        
            Custom hand-wound Nickel- (permalloy) cored interstage transformers        
            Custom hand-wound Nanocrystalline-cored output transformers        
            Complete silver wiring, including interstage and output transformers, optional        
        Power supply            
            Choke input        
            Mercury rectification        
            Film and foil-in-oil capacitors        
            Nickel (permalloy) chokes        
            Zero regulation        
    Bass amplification                
            Line-level digital signal processing (DSP)        
            Six channels (left and right, midbass and dual low bass)        
            Adjustable level        
            One thousand eight hundred watts        
            Class D        
        Power supply            
            Ultra high efficiency switching        
            Medical grade        
            Low ESR reservoir capacitance        

Speaker Small
            Solid brass horn    
            AlNiCo magnet    
            1.3" magnesium diaphragm    
            Solid hardwood horn    
            Silicon bronze throat adapter    
            Three inch aluminum diaphragm    
    Upper Bass        
            Compression-loaded open baffle    
            Ceramic magnet    
            Twelve inch paper cone    
    Low Bass        
            Compression-loaded open baffle    
            Ceramic magnet    
            Dual fifteen inch paper cones