1. INTRODUCTION
In purchasing the new SM HP4 Value, you have acquired a headphone amplifier of high class
that
meets all the demands and requirements of studio and live work. Due to its extensive functions
the SM HP4 Value is an extremely efficient and universal headphone amplifier. It has been
designed
above all as a reference unit for musicians in the studio. The unit features switching possibilities
and a sound quality few headphone amplifiers can offer. Apart from its extremely powerful
amplifiers the unit also offers an ingenious line distribution system. The SM HP4Value finds wide-
spread application throughout the world, in home/pro studios, sound reinforcement systems and
in many other audio fields.
The SM HP4 Value features a variety of monitoring and distribution options: each of the four
stereo amplifiers can accept signal from any of the two stereo inputs on the rear of the unit. This
allows two completely independent monitor signals to each set of headphones connected to the
SM HP4 Value! Ever had the drummer wanting a different mix feed from the keyboard player?? I
bet you have and now it is finally possible using the SM HP4 Value.
2. THE DESIGN CONCEPT
2.1 High quality components and design
The philosophy behind SM ProAudio products guarantees a no-compromise circuit design and
employs the best choice of components. The operational amplifiers NJM4558Dwhich are used in
the SM HP4 Value, are exceptional. They boast extreme linearity and very low distortion charac-
teristics.
To complement this design the choice of components includes high tolerance resistors and
capacitors, and several other stringently selected elements.
2.2 Inputs and outputs
All inputs and outputs are secured firmly to the exterior chassis housing. This ensures robust
quality and confidence in performance under all conditions.
