Amplifiers
 

9505

The 9505 sets a new standard of sonic excellence for professional applications. The trans·nova is a simple three-stage amplifier with unparalleled speed and accuracy. Its powr, soundstage, and exceptional image focus have previously been found only in exotic amplifiers costing 3 to 5 times the price of the trans·nova. The 9505 utilizes Strickland's U.S. patented J-FET input / MOSFET output circuit in a unique and flexible balanced design.

Many so-called "balanced" amplifiers are merely conventional unbalanced designs with a balanced-to-unbalanced converter (usually IC op-amp based) preceding the power amplifier. The 9505, however, is a true differential input power amplifier.

starting with the much acclaimed trans·nova amplifier core, each (+) and (-) port of the input differential stage has been buffered with a high impedance JFET buffer pair. This allows direct signal access to the differential amplifier, without conversion to unbalanced form. Deactivating the balanced mode is accomplished via a rear panel switch that grounds the (-) balanced inputs, effectively converting the amplifier to unbalanced operation.

Mono bridging is accomplished via another rear panel switch. In mono mode, the left channel (+) and (-) inputs are fed to the right channel, but reversed in polarity, effectively inverting the output of the right channel.

A servo-integrator has been employed to establish minimal DC offset. This avoids electrolytic capacitors in the audio path, and provides superior subsonic frequency response.

The balanced inputs offer a choice of two different connector styles, thanks to an innovative Neutrik jack that allows the use of 1/4" stereo phone plugs, or 3-pin XLR plugs. Unbalanced inputs are accessed via standard gold-plated RCA plugs.

When you build amplifiers for professional applications, quality is essential, so we back all this technology with Hafler's world class 7 year warranty.


S p e c i f i c a t i o n s

Power Rating Measured with both channels driven, from 20 Hz to 20,000 Hz with less than .1% THD 250 Watts per channel at 8 ohms, 375 watts per channel at 4 ohms 750 watts bridged at 8 ohms.

Signal-to-Noise Ratio 100 dB below rated output, unweighted

Frequency Response +0/-3 dB, .1 Hz to 300 kHz

Slew Rate 150 V/µS

Common Mode Rejection -75dB at 1 kHz

Input Impedance 47,000 ohms

Input Sensitivity for Rated Output Power 1.58 mV (for 250 watts output at 8 ohms)

Gain +29 dB

Damping Factor 1000 (to 1 kHz); 100 (to 20 kHz) 20 (to 100 kHz)

Controls and Switches Front Panel: Power switch Rear Panel: Balanced/ Unbalanced, Stereo/ Mono, chassis/float ground switch

Indicators Power lamp

Connectors Input: Dual function XLR and 1/4 inch TRS, gold plated RCA phono. Output: Dual 5-way binding posts

Warranty Seven Years, parts and labor

Power Consumption 132 VA quiescent, 1020 VA with both channels driven at 250 watts into 8 ohms

Dimensions 3 1/4" (8.3 cm) H, 19" (48.3 cm) W, 12 1/2" (31.75 cm) D

Net Weight 50 lbs. (22.7 kg)