kijanki
Responses from kijanki
| Amplifier speaker relay problems. Dsrjohn, AC voltage from one of the transformers taps produces positive voltage (D309,C309) for the status LED and the negative voltage (D308, C306, C307) to open transistor Q305. When all for transistors Q302, Q305, Q303, Q304 are open then vol... | |
| Should manufacturers provide circuit schematics & parts list? It is not only the issue of protecting their design, but also of protecting their reputation. Poorly done unqualified repairs will make percentage of the gear sound worse or fail again, making bad name for the company. | |
| Benchmark AHB2 - To 'mono' or not to 'mono' Electrical damping occurs because moving coil generates voltage that produces current in direction that causes motion of the membrane in opposite direction hence stopping the membrane. This current is equal back EMF (voltage on the speaker) divid... | |
| Benchmark AHB2 - To 'mono' or not to 'mono' A lower damping factor will make the amp sound less tight and it may give you a slight bass bump at the speaker resonance frequency. For the damping ot the membrane movement - speaker's own impedance is in the series with the amp's output. Most o... | |
| Benchmark AHB2 Amplifier, opinions and competition rvpiano, read this thread:https://forum.audiogon.com/discussions/benchmark-ahb2-amplifier-what-to-expect/post?postid=1508770 | |
| Benchmark AHB2 Amplifier, opinions and competition I upgraded to AHB2 from class D Rowland 102. I had similar impressions, but what really surprised me was bass extension. I started hearing lowest bass notes more pronounced. How different could be 5Hz@-3db (Rowland) vs 0.1Hz@-3dB (Benchmark) wh... | |
| Eliminate USB from the chain? In USB, Firewire, and Ethernet there is no issue of clock jitter since there is no clock related to D/A conversion. Information is sent as a data. The issue is to keep just right amount of it. Too much will overflow receiver’s buffer while too lit... | |
| Eliminate USB from the chain? Both Async USB and Ethernet don't operate in real time (timing doesn't matter). Because of that the only thing that counts is DAC's sensitivity to external electrical noise and amount of this noise injected in each scheme. Ethernet should be a l... | |
| Audioquest King Cobra vs. Yukon? King Cobra is a new name of Python (that had great reviews). To stay competitive AQ moved production to China, reduced prices and renamed cables. Python became King Cobra, Viper - Diamondback etc. I replaced King Cobra with much more expensive... | |
| What does a Hexfred do? rodman99999, Fig. 1 is incorrect. For that to work properly it needs grounded center tap of transformer. There are Schottkys operating at higher voltages. 60V would not be enough for most audio application since each diode in bridge rectifier... | |
| Benchmark AHB2 Amplifier, opinions and competition I've read a lot of reviews before I bought AHB2. Here is summary from "Absolute Sound"Because accuracy allied to absolutely reliable performance is the goal of all the Benchmarks, they are not products that tend to attract cults or other sorts of... | |
| What does a Hexfred do? Amplitude of the spikes produced by rectifier diodes is not as dangerous as the rate of change (dv/dt). Very narrow spikes will couple to any LC circuit causing ringing, even if inductance and capacitance are extremely small. Pretty much everyth... | |
| DSD vs PCM .. Truth or Myth SACD didn’t fail because it was an improvement, it failed because most people don’t give a damn about audio quality and think that Apple crappy ear buds are all they needMahler123Very true, but I believe that greed also helped to kill it. To char... | |
| I Think We Can All Agree... At red light a Beetle stops next to Bentley- Excuse me sir, but do you have phone in your car?- Yes I do- So do I, but what about Fax?- Yes I do- So do I, how about TV?- Yes I have TV- I have TV too. Do you have refrigerator?- As a matter of fact... | |
| Differences between cd transports? As long as data from CD is bit perfect the only thing that affects the sound is jitter. Jitter, having many different forms (correlated, uncorrelated etc.), can produce many sound signatures. D/A converter word clock's time variation (jitter) co... |