Yamaha P-series Professional Power Amplifiers P1150
The power amplifier shall have an input sensitivity of +4 dBn, requiring no more than 1,23 volts RMS to be driven to rated output into a 4 ohm load. The maximum continuous average sine wave power output over a 20 Hz to 20 kHz bandwidth for a single channel shall be (150 watts, 250 watts) onto a minimum 4 ohm load impedance, or (100 watts, 170 watts) into an 8 ohm load with no more than 0,05% thd.
Total harmonic Distortion measured at half rated power, from 20 Hz to 20 kHz, shall be no more than 0,01% . maximum intermodulation distortion, measured using the SMPTE method of 60 Hz and 7 kHz tones mixed in a 4:1 ratio, shall be no more than 0,01% measured at rated power output. Power bandwidth shall be no less than 10 Hz to 50 kHz at half rated power output, and frequency response shall be +0 dB, -1 dB from 10 Hz to 50 kHz. s/n as established by comparing the maximum output with signal to the minimum output noise with a shorted input, shall be no less than 110 dB measured with a -6 dB/octave low pass filter at 12,47 kHz (equal to a “brick wall” filter at 20 kHz), and no less than 115 dB measured with an IHF “A” weighting network. Residual output noise, measured with the input attenuator set at infinite attenuation, shall be no more than _80 dBm with a -6 dB/octave low pass filter at 12,47 kHz, or no more than -90 dBm with an IHF “A” weighting network. Slew rate shall be at least 50 volts per microsecond, full swing.
The amplifier input(s) shall be equipped with both an XLR-3 type connector and a pair of Tip/Ring/Sleeve ¼-inch phone jacks, wired in parallel. The input shall be of the electronically balanced, differential type, with an input impedance of no less than 15 k ohm presented to either balanced or unbalanced sources. The amplifier output(s) shall be equipped with a set of 5-way binding posts for positive, high-current connections, and with parallel-wired Tip/Sleeve 1-4-inch phone jacks for wiring convenience.
Input level shall be adjustable by means of (one or two) detented input attenuator(s) calibrated in 32 steps of from zero to infinite attenuation. The attenuator(s) shall be recessed, and shall be designed so as to be easily adjustable by hand, without any tools. To avoid casual or accidental setting changes, a security cover for the attenuator(s) shall also be provided.
Protection for the speaker load shall be established by means of an output-disconnect relay that is timed out when power is first applied to avoid transients from reaching the load, and that immediately disconnects the load and turns on a front-panel protection indicator in the event that more than 2 volts DC appears across the output. Further protection for the amplifier and load shall be provided by VI limiting circuitry which automatically reduces the power output in the event the load impedance is below 2 ohm for a single channel, (4 ohm for a dual-channel model in bridged mono configuration). The amplifier shall also include a full-time 2-speed fan which operates at high speed under severe thermal stress, and automatically resets to a lower speed as appropriate. Cooling air shall be drawn through a removable cleanable front-panel filter, and exhausted via ports in the tip and side panels of the amplifier.
Signal level indication (per each channel on dual-channel models) shall be provided by two LEDs, one of which turns on when the output THD is equal to or above 1%, which would indicate the onset of clipping, and one which turns on when the output level is equal to or greater than 2 volts RMS, which would indicate the presence of program signal.
Specifications P1150
Power Output Level (THD =0,05%)
20 Hz – 20 kHz : 100 W (at 8 ohm); 150 W (at 4 Ω )
1 kHz: 105 W (at 8 Ω ); 165 W (at 4 Ω )
fr: 10 Hz – 50,000 Hz (8 Ω ) +0 -1 dB
Power Bandwidth (THD <=0,1%)
10 Hz to 100,000 Hz (55 W) at 8 Ω
10 Hz to 100,000 Hz (75 W) at 4 Ω
Total harmonic Distortion:
Less than 0,007% ( 55 W, 20 Hz – 20 kHz, 8 Ω )
Less than 0,003% ( 55 W, 1 kHz, 8 Ω )
Less than 0,005% ( 75 W, 1 kHz, 4 Ω )
Less than 0,01% ( 75 W, 20 Hz – 20 kHz, 4 Ω )
Intermodulation Distortion (60 Hz : 7 kHz = 4:1)
less than 0,005% (55 W, 8 Ω )
less than 0,01% (75 W, 4 Ω )
Damping Factor
Better than 110 (1 kHz , 8 Ω ); better than 55 (1 kHz , 4 Ω )
Signal-to-Noise-Ratio:
Better than 110 dB (Input Short; 12,47 kh z, -6 dB/octave LPF)
Better than 115 dB (Input Short, IHF A Network)
Slew Rate
± 50 V/µsec (8 Ω , Full Swing)
Sensitivity : +4 dB (1,23 V rms) for nominal output (4 Ω load)
Voltage Gain: 26,0 dB
Input Impedance: better than 15 k Ω , Balanced or Unbalanced (Att. Max)
Residual Noise (Input Att. Minimum)
Less than -80 dBm, -6 dB/oct. LPF at 12,47 kHz
Less than -90 dBm, IHF A network
Indicators
Signal: Green LED(-20 Hz to 20 kHz, Vo better than 2 V
Clipping: Red LED Total harmonic Distortion: better than 1%
Protection: Red LED (during the protection or muting is on)
Pilot: Red LED Power ON
Protection Circuits
Muting: 6 ± 2sec After Power ON
DC Sense: DC ± 2 V Ouptut Voltage
Thermal: better than 85°C Heat sink temperature
PC Limiter: ON RL less than 2 Ω
FAN Circuit
Better than 60°C High speed run, Heat sink temperature
Less than 45°C Restoration of a low speed run, Heat sink temperature
Front Controls: 32 step Input Attenuator (0 to -20 dB in 1 dB steps, -20 to -30 dB in 2 dB steps, then -33, -37, -42, -50, -60 dB, and infinite attenuation
Push ON/Push Off Power Switch
Power Requirements
220/240 V AC 50/60 Hz (General model) 120 V AC, 60 Hz (US and Canada models)
Power Consumption
400 W (General mode); 250 W, 300 VA (US and Canada model)
dimensions (W x H x D): 480 x 132 x 423 MM (18-7/8” x 5-1/4” x 16-5/8”)
Weight: 13 kg (28,6 lbs)
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