Technics SH-9020 VU Meter
RM1,190.00
Technics developed the SH-9020 peak/average meter unit to give you the signal and output information you need to make absolutely sure your components are delivering the high fidelity performance that you demand.
The SH-9020 functions in three modes: Peak, with an unheard of attack time of 100psec, Peak Hold, and Average at a level of performance way above VU meter industry standards. With this capability, you can expect to realize a degree of high fidelity sound reproduction that until now existed mostly in theory.
It uses a full-wave rectifier.
It either has an instantaneous peak attack, or a 200 mS attack in average mode.
Decay is either roughly VU, or infinite.
The front panel selects either of two loop-through line-level RCA inputs, or the back-panel speaker level (power) inputs.
Watts are measured as voltage, then displayed as power into your choice of 8Ω, 6Ω or 4Ω. The +20 dB range switch is on front, and the 8Ω, 6Ω or 4Ω selection switch is on the back. The SH-9020 is calibrated in dBu (0 dBu = 774.6 mV) for line levels, but it’s not marked that way. A standard CD player or DAC has a 2 V maximum output, and will read +8.2 dBu peak. Peak and Aveerage levels are calibrated for the RMS value of a sine wave; in other words, a sine wave will read the same in either the Peak or Average settings.
Country of origin: Japan
| Line-Level Inputs (Inputs 1 and 2) | |
| Description | The SH-9020 is calibrated in dBu, but it never tells you that. A dBu is dB relative to the voltage which produces 1 mW into 600Ω, or 774.6 mV. |
| 0 dB (sensitivity switch out, rarely used) | 0 dB is +20 dBu or 7.746 V. Full range reads -30 dBu to +30 dBu (24.5 mV to 24.5 V). |
| + 20 dB (sensitivity switch in, normal setting) | 0 dB is 0 dBu or 774.6 mV. Line levels read directly in dBu from -50 dBu to +10 dBu (2.45 mV to 2.45 V). A standard CD player or DAC has a 2 V maximum output and will read +8.2 dBu peak. |
| Speaker (Power) Input (Input 3) | |
| Description | The meter reads voltage, displayed as watts. |
| Power Conversion | A watt is either 2.828 V into 8Ω, 2.4495 V into 6Ω, or 2.000 V into 4Ω. The 5dB markings correspond to 3.16 intervals, i.e., 316 mW, 3.16 W, or 31.6 W, etc. |
| 0 dB (sensitivity switch out, normal position) | 0 dB is 100 watts power (+20 dBW or 28.28 V into 8Ω). The lower scale reads correctly. Add 20 from the dB reading to get dBW. The dB scale reads power from -30 dBW to +30 dBW (1 mW to 1 kW, or 89.44 mV to 89.44 V into 8Ω). The 1 dB markings at the top refer to 125 W, 160 W, 200 W, 250 W, 316 W, 400 W, 500 W, 630 W, 800 W, and 1,000 W. |
| + 20 dB (sensitivity switch in, used only at quiet levels) | 0 dB is 1 watt (0 dBW or 2.828 V into 8Ω). The dB scale reads directly from -50 dBW to +10 dBW (10 μW to 10 W or 8.9 mV to 8.944 V into 8Ω). The wattage scales must be divided by 100. What reads as 100 W is really 1 W, full-scale 1,000 W is really 100 W, and the lowest -50 dB reading isn’t 1 mW; it’s only 100 μW. The 1 dB markings at the top are 1.25 W, 1.6 W, 2 W, 2.5 W, 3.16 W, 4 W, 5 W, 6.3 W, 8 W or 10 W. |
