Meyer Sound Control Electronics Unit S 1 Users Manual
S-1 to the manual 3a738cf3-21d8-461f-9cbe-e5bf7c1c3b93
2015-02-09
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S-1 Control Electronics Unit Operating Instructions The Meyer Sound S-1 is a single-channel active signal processor designed for use with the USM-1 Loudspeaker. It occupies a single 1 3⁄4inch rack space. The functions of the S-1 are: • • PUSH + Loudspeaker frequency and phase response alignment Input 90-250 VAC 50-60 Hz 100mA MAX 105-125 AC Voltage Ranges - Lo Sense - Hi Sense Lo Out Hi Out 210 - 250 180 - 210 105 - 125 90 - 105 210-250 180-210 AC Voltage 1/4 A SloBlo Input PUSH PUSH Lo Channel – • CAUTION: Set voltage before applying power. + GND Input SpeakerSense™ driver protection with MultiSense™ function True excursion limiting to protect the USM-1 drivers + 90-105 Active crossover for biamplification • + Lift Amplifier + Hi Channel – + Loudspeaker Cable Connections The S-1 operates at line level and is intended to be the final component in the signal chain before the power amplifier. Connections between the S-1 and the power amplifier should be made according to the diagram above. 1. Signal inputs to the S-1 may be either balanced or unbalanced. For best signal-to-noise ratio, use balanced connections operating at +4 dBu nominal. The S-1 will accept peak input levels up to +26 dBu balanced, or +20 dBu unbalanced. The Sense connection must be made in order for the driver protection circuitry to operate properly. Note: The S-1 Sense inputs incorporate Meyer Sound’s exclusive MultiSense™ function, which allows use of multiple power amplifiers driven in parallel from a single S-1 and having different voltage gains and/or power ratings. The S-1 accommodates up to two power amplifiers, and provides a separate Sense input for each. The MultiSense circuit automatically tracks the power amplifier with the greatest output swing to control the system protection circuitry. These inputs are polarity-sensitive: be certain that they are connected with correct polarity, as indicated on the S-1 rear panel. Note: The S-1 utilizes Meyer Sound’s exclusive ISO™ Input. Pins 1, 2 and 3 are transformer-isolated, and the connector shell is connected to earth ground. The Input GND/ Lift switch controls the connection between pin 1 and circuit common, which is tied to AC/chassis ground through a 500 ohm resistance. If hum problems occur, this switch may be used to control ground loops in the system. 3. Signal outputs from the S-1 are active balanced at +4 dBu nominal operating level, with pin 1 tied to earth/ chassis ground through a 500 ohm resistance. The maximum output level is +26 dBu balanced (+20 dBu unbalanced). 2. SpeakerSense™ connections are made from the output of the power amplifier back to the S-1 Sense inputs. The Hi output of the power amplifier must be connected to the Hi Sense input, and the Lo output of the power amplifier to the Lo Sense input . 4. Connections between the power amplifier output and the USM-1 should be made in accordance with the USM-1 Operating Instructions. These connections must be verified for correct polarity and correct channel assignment (Hi to Hi, Lo to Lo). Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, CA 94702 S-1 Control Electronics Unit Operation Operating Instructions Once all the connections have been made and verified, the system is ready to operate. • Preset Panel Controls The S-1 Attn dB level control should be set at minimum. • Switch on the AC power to the S-1 first, then to the power amplifier. • Set the power amplifier level controls (If any) to maximum. The setup controls on the S-1 Preset Panel are designed to be used to tailor the system response for particular applications. Remove the Preset Panel cover plate to adjust the controls. Safe Switch. The S-1 incorporates three limiters in the SpeakerSense driver protection circuitry (see detailed description, below). When the Safe switch is engaged the RMS limiters come on at 6 dB lower power levels, affording added protection when heavy continuous power demands are placed on the system (the VHF peak limiter threshold is unaffected). For operator convenience, a green LED indicator is provided on the S-1 front panel and when the Safe switch is engaged, this indicator will light. Note: It is recommended that the Safe switch be engaged until the operator is familiar with the system’s capabilities. SpeakerSense™ Driver Protection Through the Sense connections back to the S-1 from the power amplifier, the SpeakerSense circuitry of the S-1 continuously monitors the voltage across both the high and low frequency drivers. If the amplifier output exceeds the safe operating limits of the drivers, independent highand low-frequency limiters are automatically activated, holding down the power level of the S-1 outputs. The operation of the SpeakerSense circuitry is indicated by a set of five LEDs located on the front panel. Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, CA 94702 • Advance the S-1 Attn dB level control to set the system sensitivity. If the system is not operating properly, recheck all connections. Note. The Attn dB level control markings are merely a visual aid and should not be used to balance two systems. The output of the S-1 is calibrated only when the level control is fully clockwise. VHF Switch and Control. The VHF Switch affects the very high frequency response of the system. It selects either a preset (CAL) high frequency response or variable response (VAR). In the VAR position, system response around 16 kHz is adjustable (3/4 turn screwdriver adjustment) from +3 dB to -3 dB around the preset point (CW for increased level at 16 kHz). This feature may be used to emphasize or de-emphasize sibilants, compensate for room acoustics, etc. Lo Cut Switch. This switch introduces a 6 dB/octave high pass filter at 160 Hz. It is designed to provide an alternative crossover slope when using Meyer Sound subwoofers, and can also be used to compensate for the proximity effect of cardioid microphones. For additional information, see Use with Meyer Sound Subwoofers. Sense indicators. These function as signal presence indicators, and verify that the Sense connections to the S-1 are made. These indicators will be lit whenever a signal is present, or will flicker at low signal levels. Limit Indicators. These indicators will come on whenever the corresponding limiter is activated, and a moderate amount of flashing of these indicators is acceptable. The HF and LF limiters have an attack time of 100 msec so they will not affect peaks in the program material, nor will they prevent momentary amplifier clipping on peaks. S-1 Control Electronics Unit Operating Instructions Limiter Operation To verify limiter operation in the field: • Disconnect loudspeakers, leaving the amplifier and the S-1 in their standard connection configuration. • If your amplifier requires a load, use resistive loads sufficient to dissipate the full power of the amplifier. • Turn on both the S-1 and the amplifier. • Balancing Amplifier Gain • Connect the S-1 and amplifiers as you wish to use them, leaving speakers disconnected. If an amplifier requires a load, use an 8-ohm resistor sufficient to dissipate the full power of the amplifier. Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, CA 94702 Supply an input to the S-1, preferably a sine-wave oscillator. If you do not have an oscillator, use a microphone and a mixer to produce a line level signal. Set the input frequency according to this table: LF limiter HF limiter VHF limiter Oscillator 200 Hz 5,000 Hz 16,000 Hz Microphone low growl loud whistle loud hiss • Bring up the input until you see the corresponding limit indicator come on. Since the indicator will light only if the limiter actually operates, it provides a positive indication that the limiter is functioning. • Input the oscillator to the S-1 and set its frequency to 1400 Hz ±5 Hz (Use a frequency counter if possible). • Set the S-1 Lo Cut switch out, the VHF switch to CAL, and the Safe switch out. • Measuring with the voltmeter at the Hi amplifier output, advance the S-1 Attn dB control to a convenient reading (a few volts). • Now measure at the Lo amplifier output, If the level is different, adjust the input level control of the amplifier whose output voltage is higher until the Hi and Lo outputs are equal. Set the VHF switch to VAR, the Lo Cut out, and the Safe switch in. The standard connection configuration for the S-1 Control Electronics Unit uses a single two-channel amplifier as a biamplifier, one channel for the lows and one for the highs. In large systems where a number of S-1’s are used, some may prefer to assign one or more amplifiers only to the lows, and other amplifiers only to the highs. In either case, the Lo and Hi amplifiers must have equal voltage gain. If they do not, you may balance your system using an oscillator and an RMS-reading voltmeter. • • S-1 Control Electronics Unit Operating Instructions Specifications Input Type1 Balanced ISO-Input,™ 10k ohms, 5k ohms per leg Output Type Active push-pull, 600 ohms output impedance Maximum Input Level Balanced Unbalanced +26 dBu +20 dBu Maximum Output Level Balanced Unbalanced +26 dBu +20 dBu Hum and Noise2 <-90 dBV Dynamic Range3 108 dB Sense Inputs 10k ohms true differential, opto-isolated Electronic Crossover Frequency 1400 Hz Low Frequency Delay Type Active all-pass Note 1: ISO™ Input: Pins 1, 2 and 3 are transformer-isolated, and shell is connected to chassis/AC earth ground. Note 2: “A”-weighted, unbalanced. Driver Protection Circuitry Low Frequency Note 3: “A”-weighted noise floor to maximum output. High Frequency Indicators Sense/Amplifier Gain Detect; Hi and Lo RMS Limiter, Excursion Limiter; Hi, Lo and VHF Safe Power Supply Controls Front Panel Preset Panel Rear Panel RMS limiter, 100 msec. integration time LF excursion limiter (instantaneous) RMS limiter, 100 msec. integration time VHF peak limiter, 2 msec. on-time, 35 msec. release time HF excursion limiter (instantaneous) Green/Red LEDs Red LEDs Green LED Green/Red LED Input attenuator, AC power switch Lo Cut switch, Safe switch, VHF var/cal switch VHF control (3/4-turn screwdriver adjust) Ground lift switch, AC range switches Connectors Balanced Input/Output Sense Inputs 3-pin XLR (A-3) female/male Banana jacks (4 dual) Power 90-125/180-250V AC, 50/60 Hz (rear-panel switchable) Physical Dimensions 19" W x 13⁄4" H x 73⁄4" D, standard rack mount Weight 8 lbs (3.6 kg) Meyer Sound Laboratories, Inc. © 1992 Meyer Sound 2832 San Pablo Avenue Berkeley, CA 94702 05.150.002.01A
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