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Table of Contents
Summary of Contents for Zahl HM1
- Page 1 ZÄHL HM1 Manual V 1.0...
- Page 2 HM1 Reference headphones mixing amplifier Reference Amplifier with unprecedented transparency and precision, attention to detail and massive power performance. Rich feature set for both high-end enthusiasts and professional users. • perfect impulse reproduction • ultra wide frequency response • extremly low impedance output precisely controls complex loads •...
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Page 3: Table Of Contents
Class A & Servo - HM1 realisation ........ -
Page 4: Notes, Safety Instructions, Warranty
ZÄHL HM1 MANUAL V 1.0 NOTES, SAFETY INSTRUCTIONS, WARRANTY The equipment must only be used for the purpose described in this manual. 2. Keep the manual for further reference. When passing the equipment on, enclose the manual. 3. Do not operate the equipment at - very high air humidity (>85% relative humidity) -
Page 5: Scope Of Delivery
• First read the chapter NOTES, SAFETY INSTRUCTIONS; WARRANTY in this manual. • Remove the HM1 from its packaging: insert your hands into the foam recesses on the front and back of the unit, reach your fingers slightly under the unit and then lift it upwards. Do not lift the unit by the knobs or the connectors. -
Page 6: Legend
ZÄHL HM1 MANUAL V 1.0 LEGEND P.6 | LEGEND... - Page 7 LEGEND | P.7...
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Page 8: Application Examples
Activate the sources alternately by the Chan on/off switches. 2-Channel Mixing Console As a mixer, the HM1 can merge any two sources at Inputs A and B to create a new music programme - or simply cross-fade from one source to the other. -
Page 9: Special Features
SPECIAL FEATURES UNIQUE: CLASS A POWER AND A STEP BEYOND • Class A power amplifier in its purest form • switchable negative feedback („servo“) while maintaining Class A operation CROSS-FADE, COMPARE OR MIX TWO STEREO SOURCES • Cross-fade or switch between two stereo sources (channel A /channel B) •... -
Page 10: Details
Class A - HM1 realisation The HM1 power stage provides massive power reserves, which is already evident from the fact that it consumes almost 40W in idle mode. The output power is more than sufficient for any application, and in the millisecond range it is increased substantially. -
Page 11: A Little Theory
A/B comparison Concerning the reference quality of the HM1, the idea of using it for critical A/B comparisons is most obvious - be it for evaluating different sources like D/A converters or cartridge systems in the high-end range or comparing different mixes or sound processing options in the professional range. -
Page 12: Cross-Fade
Sound Adjustment This stage is not designed to massively affect the sound. As a rule, all audio gear connected to the HM1 is of extremely high quality, a classic tone control would not be appropriate. -
Page 13: Stereo Base Control, A Little Theory
Ideally, the XLR 4-pin is used in conjunction with balanced wired headphones. In this case, the signal currents of the two power amplifiers are not mixed with each other, mutual interference is impossible. The HM1 can unfold its full quality (also refer to chapter "Dual Mono Design"). -
Page 14: Dual Mono Vs. Balanced Amplifier Design
The output select toggle switch - located on the front panel above the XLR headphones output - is very useful if you are using your HM1 to drive your headphones as well as to drive a power amp or active speakers at the line outputs. -
Page 15: Line Inputs
When using the jack output, the ground wires of both channels are connected in the jack socket and the jack plug of the headphones. The use of headphones with jack plugs therefore is not that ideal. In the HM1, however, an optimised ground routing ensures that the disadvantageous effects are as low as possible. -
Page 16: Power Supply
The mains adapter also contains a standby power supply unit which delivers a stabilised low voltage. This voltage is applied to the Power switch on the front panel of the HM1 and serves to switch on the actual mains transformer via a relay. -
Page 17: Technical Data
TECHNICAL DATA Headphones Output Class A Impedance 0,8Ω max. level +23dBu Class A & Servo Impedance 0,045Ω max. level +23dBu unbalanced / dual mono design Output Power per Side 4W@30Ω / 7W@15Ω Peak 7,6W@30Ω / 11W@15Ω / 12W@10Ω (18W for 1,5ms) Headphones Output THD (Total Harmonic Distortion) Class A 0,07%... -
Page 18: Troubleshooting
ZÄHL HM1 MANUAL V 1.0 TROUBLESHOOTING Checking mains fuses In case your HM1 does not show any function although it is correctly connected and switched on, you may check the mains fuses on the Mains Adapter HMP1. • Unplug the power cable.