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HD

REFERENCE

Operating Manual

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Summary of Contents for HD Reference

Page 1: ...HD REFERENCE Operating Manual...

Page 2: ...efit of bandwidth The HD Reference also has a few added features such as a display that shows gain in dB next to the knob that allows one to set gain in accurate 1dB steps which is great for setting u...

Page 3: ...e 2012 19 EU this product must not be disposed with household waste This product should be taken to a licensed EEE collection center for recycling If you need to replace the mains fuse make sure the r...

Page 4: ...r of damaging the microphone Just to complicate matters the length and capacitance and quality of the microphone cable may be the biggest factor for the microphone and its transformer to deal with Thi...

Page 5: ...but were intended to be simple problem solvers We might characterize the high pass filters in the HD Reference as relatively gentle and safe The filters are 6 dB oct types with minimal phase shift an...

Page 6: ...ecision APx515 measuring itself Only the 60 dB gain setting red line shows any visual departure from the others 0 5 dB at 5 Hz 2 5 dB at 2Hz With 40 dB gain you can see the HD Reference measured as fl...

Page 7: ...wing for noise With the noise floor the actual THD N becomes 0 003 near 10 dBu for the 40 dB gain setting and 0 001 near 15 dBu output level for the 0 dB setting The rising slope towards the left simp...

Page 8: ...ncies and high levels but are sometimes biased them to bring in some 2nd These graphs show a nice onset and harmonic balance Figure 8 shows two tones 200 and 2 kHz at 0 dBu input each at 6 dB to illus...

Page 9: ...8 48 Volt Phantom Power when lit POL Reverse Output Polarity when lit LOW Z 300 300 Ohms Input Impedance when lit LOW Z 1K 1000 Ohms Input Impedance when lit With neither 1K and 300 pressed the input...

Page 10: ...DI input is not supplied with Phantom Power Low Cut 39Hz A 39 Hz low cut filter is activated when lit avoiding unwanted low frequencies while tracking Low Cut 82Hz A 82 Hz low cut filter is activated...

Page 11: ...rs there are graphs and FFT plots that are even more impressive to those familiar with testing high gain audio amplifiers For example the distortion remains low and flat well beyond 20 Khz unlike most...

Page 12: ...appreciable capacitance into the chain In extreme cases this might attenuate high audio frequencies In less extreme cases cable capacitance can affect phase response at 20K and can be a difficult load...

Page 13: ...Contact Info Fredenstein Professional Audio by Orion Communication 7F 1 No 582 Ruei Guang Rd Neihu District Taipei 114 Taiwan Phone 886 2 2657 2618 Email info fredenstein com Web www fredenstein com...

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