GLADIUS CAE 
LARGE FILE
Gladius is the smallest amplifier which we manufacture. It is rated at 75watts continuous power per channel into 4 ohms and 150watts per channel into 2 ohms. The preamplifiers feature fully variable 24dB/Octave high (HP)and low pass (LP) crossovers with a range from 46Hz to 3.5KHz. A low frequency boost control allows for up to 18dB of boost at the centre frequency of 44Hz. The level control allows signals from 260mV to 8v to drive the amplifier to rated power. A selector switch does double duty for the amplifiers proper and the line output. In the flat mode both are fed full range signals. When in "Amp LP" the line output is fed the HP signal and when in "Amp HP" the line output is fed the LP signal. A "mode" switch allows for the complete bypass of the front end with the exception of the level control. Complete ground isolation is achieved through the use of our unique Balanced Differential Drive preamplifier. At present we offer the choice of two IC chipsets for the preamplifiers. The standard uses a low noise bipolar input style op-amp and the option is a BIFET Burr Brown chipset.
The main power amplifiers in Gladius are fully complementary from input to output, they use temperature compensated constant current sources to drive the differential input transistors. This ensures that with varying temperature the DC conditions within the amplifier are kept constant. The inputs are fully balanced, using our Differential Drive circuit. The circuits employ substantial amounts of local feedback which allows us to use very little global feedback. Low THD was not our goal, rather sound quality. The output stages use high frequency Bi-polar output transistors. These have an Ft of 20MHz and are very linear with respect to gain. Gladius has FOUR 100 watt transistors per channel. Zed has always been a strong proponent of having output stages vastly over rated. The reliability of the amplifier is improved when output devices are run at fractions of their capability. Using multiple lower powered output devices is superior to using single high powered devices. Please refer to the section under Techtalk Output Transistors.
The power supplies are fully regulated and there are no less than THREE separate sets of these. The main high current pair run the output stages, a regulated +/- 12v pair run the differential amplifiers and their associated constant current sources and the last pair which run from a completely separate transformer supply DC to the preamplifiers. This isolation assures minimum interference from one amplifying stage to the next. The main high current supply uses a bank of four 2,200mfd capacitors together with SIX high current Mosefets as the main switching elements and the twin high speed switching diodes, through a common mode choke, feed another bank of 8,800mfd for the main amplifier's supply. Since the power supply runs at about 60KHz this is ample capacitance to assure full power at 10Hz.
The mechanical parts were chosen for reliability and cosmetics. RCA sockets are solid gold plated machined brass types with teflon inserts. The power and speaker connectors are again solid gold plated machined brass types. The Power terminals accept up to #4 wire and the speaker #8.
Gladius Specifications
Output Voltage (volts into 2 ohm) per channel 17.32v
Output Voltage (volts into 4 ohms) per channel 17.32v
Output Current (amps into 2 ohm) per channel 8.66A
Output Current (amps into 4 ohms) per channel 4.33A
Continuous Output Power into 2 ohm per channel 150wx2
Continuous Output Power into 4 ohm per channel 75wx2
Typical Output Power into 4 ohm per channel (0.8% THD) 95wx2
Continuous Output Power 2 channels bridged into 4 ohm 300wx1
Continuous Output Power 2 channels bridged into 8 ohm 150wx1
Minimum Speaker Impedance per channel 2 ohm
Minimum Speaker Impedance in Bridge Mode 4 ohm
Power Response at any power into 4 ohms/channel 10-100KHz -3dB
Frequency Response at rated power into 4 ohms/channel 10Hz-25KHz -0.1dB
Input Voltage range for rated power into 4 ohms 0.26-8 volt
Input Impedance 47K ohm
Noise below rated output (30KHz limited) -98dB
Channel separation at 2KHz >80dB
Damping Factor at 20Hz with 4 ohms >180
Total Harmonic Distortion with 4 ohm 20Hz-20KHz
From 1 watt to rated power. Typically less than 0.05% <0.08%
Intermodulation Distortion <0.08%
Phase response at 20KHz Lagging 10 deg
Slew rate (volts per micro second)-In”Flat” mode 15
Low Pass Crossover (all are 24dB/octave) 46Hz-3.5KHz
High Pass Crossover (all are 24dB/octave) 46Hz-3.5KHz
Equalization (Zero to +18dB variable control) Bass Boost @44Hz
Remote Level Port with control N/A
Line Output Yes
Protection - Short Circuit, DC, Thermal Yes
Power Source 10-14.5v DC
Current Consumption with Sinewave at 4 ohms 20A
Current Consumption with Music at 4 ohms 6A
Idling Current <1.5A
Fuse rating with 4 ohm load/channel 25A
Fuse rating with 2 ohm load/channel **** 35A
Size W x H (302.22mmx74mm/11.9”x2.91”) x L 314.4mm/12.4”
Shipping Weight (Kg/Lbs) 7.3/16
**** Under normal operating conditions the fuse rating for 4 ohm loads will suffice for 2 ohm loads. If the amplifier is driven for long periods of time into
2 ohm loads per channel the fuse rating may be increased as shown. DO NOT OVER FUSE ANY AMPLIFIER.
