POWER AMPLIFIER XH150 Owner’s Manual POWER POWER AMPLIFIER XH SERIES ON OFF POWER SIGNAL CLIP CH A PROTECTION CLIP SIGNAL CH B E
Introduction Thank you for purchasing a Yamaha XH150 power amplifier. The development of the XH150 was enriched by Yamaha’s wealth of experience in building PA equipment and its tradition of precision circuit design technology. This amp is dedicated to driving high-impedance speakers, and feature high power and superb quality together with superior reliability and stability, guaranteeing the highest possible audio performance.
Precautions • • • • • • • • • Connect this unit’s power cord only to an AC outlet of the type stated in this Owner’s Manual or as marked on the unit. Failure to do so is a fire and electrical shock hazard. Do not allow water to enter this unit or allow the unit to become wet. Fire or electrical shock may result. Do not place heavy objects, including this unit, on top of the power cord. A damaged power cord is a fire and electrical shock hazard.
Controls and Functions ■ Front Panel POWER 1 3 2 ON 4 OFF POWER SIGNAL CLIP CH A 1 POWER switch and indicator This is the main POWER switch. Press to power ON the amplifier. Press again to power OFF. The POWER indicator lights up when the amplifier is powered ON. 2 SIGNAL indicators These green LED indicators light up when the respective channel’s output signal exceeds 4 Vrms.
■ Rear Panel 1 2 3 4 FILTER CHANNEL B CHANNEL A LOW CUT LOW CUT 40Hz OFF OFF 15 20 40Hz 80Hz 80Hz 40 00 HIGH CUT –dB 0 00 –dB 0 CHANNEL A SPEAKERS OUTPUT VOLTAGE HIGH CUT 5kHz 10 6 3 25 30 40 CHANNEL B OFF 15 20 10 6 3 25 30 CHANNEL B 5kHz 10kHz OFF 10kHz 70V – INPUT CHANNEL B + + – INPUT CHANNEL A CHANNEL B + – G + CHANNEL A – G 70V = 32Ω/CHANNEL 100V = 64Ω/CHANNEL 5 1 FILTER switches (CHANNEL A, B) Independent low-cut/high-cut filters are provided for cha
■ Connecting Speakers The XH150 series enables you to connect multiple high-impedance speakers in parallel that support 70 V or 100 V line output. The number of speakers that can be connected varies depending on the speakers’ rated input. You can connect speakers with a total rated input per channel of up to 150 W.
You can also connect multiple speakers with a different rated input to a single channel.
Caution for Connection 1. Turn off the POWER switch. 2. Remove the cover attachment screws and remove the protective cover from the speaker terminals. Screw 15mm* 3. After removing approx. 15 mm of insulation from the ends of the speaker cables, bind the bare ends of the speaker wires in the corresponding speaker terminals and tighten the terminals to securely clamp the wires. Refer to page 5 for speaker porality. * Shown actual size.
Rack Mounting ■ Mounting in an EIA standard rack If multiple high-power amp units are mounted in a rack with poor ventilation, the heat from the amps will cause the interior of the amp to become very hot, causing the performance of the amps to be impaired. In particular, when mounting in a rack whose back can not be left open, mount according to the following instructions. Rack: Leave a gap of 10 cm or more between the rear panel of the rack and the rear panel of the amplifier. Fan: Use a fan with 1.
Specifications ■ General Specifications Power Output Level (Rated Power) 20 Hz~20 kHz, THD+N= 0.1% Power Bandwidth 150 W + 150 W RL= 64Ω/100 V, RL= 32Ω/70 V Half Power 10 Hz~40 kHz (THD+N= 0.1%) Total Harmonic Distortion (THD+N) 20 Hz~20 kHz, Half Power 0.1% Frequency Response +0.5, –1 dB Intermodulation distortion (IMD) 60 Hz:7 kHz, 4:1, Half Power 0.1% Channel Separation Residual Noise Half Power Vol. max., input 600Ω shunt Vol. min. 12.
■ Block Diagram INV INPUT CHANNEL A BA HPF SIGNAL CLIP LPF CHANNEL A 80Hz 40Hz OFF + CHANNEL A – 10kHz 5kHz OFF LOW CUT G – 100V OUTPUT VOLTAGE + – SPEAKERS SIGNAL CLIP + Protector CHANNEL B – G INPUT CHANNEL B + Amp HIGH CUT INPUT CHANNEL B CHANNEL A PROTECTION 70V BA LPF HPF CHANNEL B 80Hz 40Hz OFF LOW CUT 10kHz 5kHz OFF INV HIGH CUT D:319 ■ Dimensions H:132 W:480 Unit: mm 11
Troubleshooting The following table lists the main causes of abnormal operation and the corrective measures required, as well as the protective circuit operation in each case. Indicator Probable Cause Protection Circuit There is a short at a speaker terminal, amplifier terminal, or wire. Locate and correst the cause of the short. The amplifier load is excessive.
YAMAHA CORPORATION V294640 R2 1 IP 16 NP Printed in Taiwan Pro Audio Division, #18/3 P.O.