- Written by Secrets Senior Editors
- Published on 02 August 2011
- The Secrets Blu-ray Player HDMI Benchmark - Part 2
- Page 2: The Tests
- Page 3: Test 1 Summary and Results
- Page 4: Test 2 Summary and Results
- Page 5: Conclusion
- Page 2: Construction of the Analog Blocks
- Page 3: Volume Control
- Page 4: Power Amplifier
- Page 5: Phono Stage
- Page 6: Headphone Stage
- Page 7: Analog Circuitry Connected to the DACs
- Page 8: Conclusions About the HK 990 Circuit Design
- Page 9: Tape Recorder Outputs and Tape Monitor Details
- Page 10: Proper Connection
- Page 11: Conclusions About HK990 Tape Recorder Functionality
- Page 12: Overall Conclusions
- All Pages
In the end, there really is no way to calibrate around these errors, as hooking the player up to a properly calibrated display will result in a dark image and missing highlights in this case, or you can calibrate your display for the player, and then suffer blown-out highlights and a lack of contrast and pop in your image for all other sources. Of course, the issues vary player-to-player, but the end result is the same: compromised performance.
Even when the decoding and conversion errors in your player are small, those can add up as the signal moves through the rest of your signal chain. Your display will certainly have some error in it, and perhaps your receiver or processor will introduce errors as well. All of these small amounts can wind up producing an error large enough for anyone to notice. Some people may still not care that their player has problems in its output, but since there are players out there that decode and output to all colorspaces correctly, there is no reason we have to accept this. We hope this helps to further explain our new testing methodology.
Circuit design and the tape recorder section are the focus of the final section of my HK 990 review. The topics are addressed to different groups. Those interested in the tape recorder section will find information on Page 9. The tape recorder interface section outlines matters of connectivity and usage.
Introduction to Harman Kardon HK 990 Stereo Integrated Amplifier with Digital Room Correction and Dual Subwoofer Bass Management – Part III
Circuit design and the tape recorder section are the focus of the final section of my HK 990 review. The topics are addressed to different groups. Those interested in the tape recorder section will find information on Page 9. The tape recorder interface section outlines matters of connectivity and usage. Usability issues are discussed. The tape recorder interface section is at the level of the prior two parts and assumes no knowledge of circuit-level electronics.
The circuit-design section enters the land of high-end design, mostly guided by the design principles of Matti Otala. My intent here is two-fold: to identify anything that might make the unit sound better subjectively, and to objectively quantify whether any aspects of the design have inadvertently degraded performance.
- Design: Solid State Stereo Integrated Amplifier
- Power: 2 x 150 watts RMS into 8 ohms @ 20 Hz - 20 kHz, 2 x 300 Watts into 4 Ohms
- MFR: 10 Hz – 100 kHz
- THD: <0.07% at Full Output (8 Ohm Load)
- Analog Inputs: 7, Plus 1 Phono MC, 1 Phono MM, and 1 Balanced XLR
- Digital Inputs: 1 HRS-Link, 2 Optical Digital, 2 Coaxial Digital
- Analog Input Sensitivity/Impedance: 350mV/43k ohms for tuner/CD, 10mV/47k ohms for Phono-MM, 1mV/100k ohms for Phono-MC
- Digital Input Capability: All Standard Digital Formats
- Dimensions: 6.4" H x 17.3" W x 17.5" D
- Weight: 43.2 Pounds
- MSRP: $2,599 USA
- Harman Kardon
- SECRETS Tags: Harman Kardon, HK 990
This circuit design section assumes the reader has knowledge of analog design equivalent to a 1980's Audio magazine. I started reviewing in the 1980s. I took my cues at what level to write from Audio and never let go. Some of the technical terms bubbled to the surface in the HK 990 literature as the marketing folks tried to capture the unique aspects of the unit. You get only words without graphs or block diagrams. Usually, only when engineers write the literature does it all jell. Accuphase is an example of this practice operating to perfection. The literature Harman produced in the 80s and early 90s included circuits, novel measurements and even Bode plots. Sansui and Kenwood were producing similar material. Sansui was a big loss from the creative circuit view when it went out of business.