kijanki
Responses from kijanki
| Question on Preamp Outputs. His pre outputs 2.4V for balanced output. His amp outputs 450W for 4.2V balanced input.Amplifier’s output voltage will be a linear function of the input voltage. It has to be or amplifier will have huge distortions. Output power P = V^2 / R If you... | |
| Question on Preamp Outputs. look at the specs for the 462 amp! Both 2.1 and 4.2 volts both produce output wattage of 450! Both 2.1V and 4.2V produce the same wattage of 450W but from different inputs (balanced and unbalanced) that have different gains.Gain for this amp for 4... | |
| Question on Preamp Outputs. It is exactly what it is. His amplifier has 20dB gain for balanced input at 4ohm output posts. 20dB is10x. When you input 4.2V input output becomes 10 x 4.2V = 42V P = (42V^2) / 4 = 441WAt 2.1V input output becomes 21V P = (21V^2) / 4 = 110.25W | |
| Question on Preamp Outputs. jasonbourne52 You multiply power by the ratio of voltage and that is wrong. It is not linear problem since output power is function of input voltage squared. For instance 1/2 of voltage = 1/4 of power. | |
| Question on Preamp Outputs. Here's the math: 2.4 ÷ 4.2 = .5714 × 450 = 257.14 watts into all impedances! Power is proportional to voltage squared (2.4/4.2)^2 x 450 = 147W | |
| Low gain amp system matching @radiohead99 Voltage gain of your preamp is about 8x. In order to obtain 0dB gain (2V input, 2V output) you need to set wiper at about 50% (12 O'Clock) position (to divide by 8). Since ideal position would be around 2 O'Clock (with extra gain ... | |
| Low gain amp system matching 1V output for 126mV input is 18dB (not 15dB)If your DAC produces 2V nominal, then preamp output will be 2V x 1/0.126 = 15.9V - way too much for an amp with 2V nominal input.Perhaps your DAC has jumpers to reduce gain by 10dB (like in my Benchmark ... | |
| Which component to upgrade to improve bass control? A Hegel h390 has terrific bass control. Damping factor of 4000. Damping factor, in spite of the name, has very little to do with membrane damping because there is speaker’s own coil in series for the braking current. 8 ohm speaker has about 6 ohm ... | |
| The Importance of the Digital Cable Yes, electrical noise will be very important contributor affecting not only transmission (creating time jitter), but also polluting everything else. Reflection created jitter in cable plays separate role. Reflections will produce time jitter of th... | |
| The Importance of the Digital Cable Yes, cable delivers digital information to D/A converter to produce analog (audio) signal. When this information is delivered in exactly same intervals then everything is always the same - perfect reproduction, but the problem is, that exact momen... | |
| Is There A Reason for Mono Amps for Ultra-low Noise Class D Modules? It’s hard for me to imagine that two boxes of the same size would be easier to place than one box in a room.It will be, especially for the large units. You can always shove them together if you want to have single unit.The advantage of greater hea... | |
| Is There A Reason for Mono Amps for Ultra-low Noise Class D Modules? I guess the advantage of stereo separation is only as good as the preamp in front of it though... Also, If difference between 90dB and 100dB of channel separation is that important, then all TT cartridges are garbage, at only 30dB.It is likely fo... | |
| Cable Geometry Question Twisted pair reduces pickup from electric and magnetic fields, by exposing both wires to field evenly. I works great as long as the pitch of the twist is much shorter than wavelength of the interference signal. I'm not sure about 3 wires, but Be... | |
| Is it time for new surge suppression devices? Eric, Yes, clamping voltage is complicated. I'm only sure they have to specify lower voltage because of MOVs breakdown voltage tolerance.Thank you for bringing this subject - perhaps now whole house protection will be viewed as something standard... | |
| Is it time for new surge suppression devices? @erik_squires The element most often used is Metal Oxide Varistor. Siemens uses multiple large 150VAC 40mm MOVs. Here is data sheet for large MOVs: https://www.mouser.com/datasheet/2/240/Littelfuse_Varistor_HA_Datasheet_pdf-596397.pdfThe proble... |