The new 9505 and 9303 audio power amplifiers have true differential input amplifiers and so earn the term "balanced." Both the 9505 and 9303 are professional versions of Hafler's TransNova amplifier and use patented J-FET input stages and MOSFET output stages. The 9505 and 9303 are rated at 250 watts per channel @ eight ohms and 150 watts per channel @ eight ohms respectively.

The balanced inputs have two different connectors: the dual purposed Neutrik XLR/TRS multi-jack and for unbalanced inputs, an RCA gold jack. Mono bridging is possible by way of a rear panel switch that takes the left channel input feed, reverses polarity and feeds it into the right channel input so that the left and right channels add together in phase at the output. The 9505 is rated at 750 watts mono into eight ohms while the 9303, in bridged mono, pumps 450 watts. Full power bandwidth for both amps is 0.15Hz to 300kHz with the low frequency response due in part to the fact there are no electrolytic capacitors in the audio path.

If you understood the last paragraph then you'll like to know that both amps share the following performance specifications: >100dB "A " weighted signal-to-noise;150 volts per microsecond slew rate (that is a measure of how fast and how much the amp's output can change in response to high frequency changes present at the input..higher numbers are better...this amp is fast); 29dB gain and CMRR is rated at 75dB (Common Mode Rejection Ratio is a measure of wanted signal over unwanted signals and noise...this is a very good figure for a power amp). Typical Total Harmonic Distortion or THD is .005% at rated power at1kHz for both amps and the 9505 and 9303 have damping factors of 1000 and 800 at 1kHz respectively. The two amps weigh 50 and 36 pounds each with the 9505 using four rack spaces and the 9303 using only two rack spaces.