Toa MX-401 Operating Instructions Manual

Rear Panel [Names of components & their usage] Connection Examples Input Connections Block and Level Diagrams Specifications Characteristics Diagrams Appearance 2 2 3 4 5 6 7 8 9 9 1. XLR Type Audio Connector The connectors are wired as follows. The pin 1 is ground (shield), the pin 2 cold (low, minus), the pin 3 hot (high, plus). 2. Description of components and functions on the MX-401. Various descriptions are applied, depending on each manufacturer. In our Operating and Instruction Manual explanation of components and functions is made according to our usage for them. Contents Precautions

designed to deliver maximum features and performance in a cost-effective portable PA package. The MX-401 features four input channels, one program output, and one Foldback output. The internal amplifier is rated at 100 watts into an 8 ohm load, and 150 watts into 4 ohms. Each input channel has an electronically balanced XLR connector, and a high- impedance unbalanced 1/4" phone jack. In addition, each channel features two-band EQ, a pre-EQ Foldback send, and post-EQ reverb send. The master control section features a patchable 5-band graphic equalizer, a quality 3- spring reverb, a full patch bay with 1/4" phone auxiliary and RCA tape inputs, and master volume controls for Program, Foldback, and Reverb return to both. The power amp protection circuitry and autocomp compressor, both with LED's, are also located in this section. 1. Four input channels 2. 100 watts into 8 ohms, 150 watts into 4 ohms 3. Patchable 5-band graphic EQ 4. Auto Comp compression unit w/LED 5. Built-in spring reverb 6. Power amp protection circuitry w/LED 7. Full patch bay 8. Aux input w/level control, RCA jacks and parallel phone 1/4" jacks. 9. Reverb level to PGM and FB 10. Independent Foldback mix. Each Channel 1. Input level control 2. Two band EQ 3. Pre-EQ Foldback send 5. Low-Z electronically balanced XLR input 6. Hi-Z unbalanced 1/4" input — 2 — General Description Features

(HIGH) The high EQ control alters the high frequency response of the input channel, providing ±13dB at 10kHz, and ±15dB at 20kHz of continuously variable active shelving equalization. The "0" detented position provides flat audio response. Low Equalizer Control (LOW) The low EQ control provides ±13dB at 100Hz and ±15dB at 50Hz of continuously variable active shelving equalization. The "0" detented position pro- vides flat audio response. Reverb to Foldback Control (REV TO FB) This control adjusts the amount of reverb signal that is returned to the foldback buss and thus the level of reverb contained in the on-stage monitor mix. Reverb/Control (REV) This control determines the level of signal assigned to the re- verb mixing buss. Rotating the control clockwise increases the amount of reverb in that channel. Foldback Control (FB) The Foldback control deter- mines the level of signal assign- ed to the foldback mixing buss, thus setting the level of that channel in the on-stage monitor mix. Graphic Equalizer (EQUALIZATION) The graphic equalizer is 5 inde- pendent active bands (filters), providing 12dB of boost or cut at each center frequency. The "0" detented position provides flat audio response. Foldback Master Control (FB) The FB master control adjusts the overall combined signal level of the four independent channel foldback sends, and thus the level of the entire on-stage moni- tor mix. Aux Level Control (AUX) This control sets the overall level of the Aux input signal. Power Amp Compression Indicator (COMP) The Comp LED lights when the internal compressor is activated. The compressor is provided to protect speaker systems by com- pressing the input signal level of the power amplifier when clip- ping occurs in the output stage. Frequent flashing of the LED is not reason for alarm. However, a constant or steady light indicates that the MX-401 is being over- driven and that the internal power amplifier is possibly "under powered" for that applica- tion. The output level of the MX- 401 should be decreased until the LED only flashes intermittently. Power Indicator LED (POWER) The indicator LED lights when the power switch is "on". Input Level Control (LEVEL) The level control provides con- tinuously variable adjustment of the channel output to the program mixing buss, thus determining the level of that channel in the main sound system mix. Since the reverb signal is "post" this control, an increase in the level of the channel's output will also result in a corresponding increase in the reverb effect of that channel. The nominal level of the input level control is at the "10" posi- tion. High Impedance Connectors (HIGH Z) These connectors are unbal- anced, standard 1/4" phone jacks with an input impedance of 27k ohms, and an input level of —35dB. When a plug is inserted into the high -Z input, the cor- responding XLR connector is automatically switched out of the input circuitry. Low Impedance Connectors (LOW Z) The XLR connectors are low im- pedance, electronically balanced inputs with an input impedance of 1k ohms. Reverb to Program Control (REV TO PGM) This control adjusts the amount of reverb signal that is returned to the program buss and thus the level of reverb contained in the main sound system. Program Master Control (PGM) The PGM control adjusts the overall combined signal level of the four independent channel level controls, and thus the level of the main sound system. Aux Input Jacks (AUX IN) The phone jack and RCA pin jacks are wired in parallel, with an input level of —20dB. When a plug is inserted into the phone jack, the RCA pin jacks are automatically switched out of the AUX circuitry. Foldback Output Jack (FB OUT) This jack is for connection to external power amplifiers and/ or equalizers for the on-stage monitoring system. Nominal output level is +4dB with an impedance of 600 ohms. If the internal power amp and equal- izer are to be used for the on- stage monitor system, the FB output should be connected to the GEQ input jack. Program Output Jack (PGM OUT) The PGM Out jack is provided for connection to external equal- izers and/or power amps, deriv- ing its signal prior to the internal GEQ and power amp. Nominal o u t p u t level is +4dB with an impedance of 600 ohms. Graphic Equalizer Input Jack (GEQ IN) The GEQ input jack allows the graphic equalizer to be used in- dependently of the MX-401 with other external equipment, or the internal power amplifier and the graphic equalizer with external equipment. When a plug is inserted, the main mix from the program buss is disconnected from the graphic equalizer and the power amplifier. The nomi- nal input level is +4dB with an input impedance of 50k ohms. Graphic Equalizer Output Jack (GEQ OUT) This jack allows the MX-401 and the internal graphic equal- izer to be used w i t h an external power amplifier, or in conjunc- tion with the GEQ in jack, to be used independently of all other MX-401 circuitry. Nominal o u t p u t level is +4dB w i t h an impedance of 600 ohms. Power Amp Protection Indicator (PROTECT) The indicator LED lights if the power amplifier output is short- ed, if the temperature of the unit rises above acceptable levels, or if DC is drifted to the speaker outputs. If the LED should light, speaker wiring and ambient temperature of the MX-401 should be checked. If the LED remains lighted, the unit should be referred to qualified service personnel for repair. Note: The MX-401 protection circuitry will (1) detect 'faulty conditions' within the power amplifier, (2) give a visual indication, and (3) automatically shut down u n t i l the fault condition is alleviated. This special circuitry ensures maximum reliability and vir- tually eliminates equipment damage due to unsafe or fault conditions. Please refer to fault protection table on page 4 for full explanation of this im- portant feature. Power Amplifier Input Jack (PWR IN) The PWR Amp input jack allows the i n t e r n a l power amplifier to be used with external equip- ment. When a plug is inserted, the power amp is automatically disconnected from the MX-401 mixer section. The nominal in- p u t level is +4dB with an input impedance of 10k ohms. — 3 — Front Panel

The power switch is a three- position type with the middle position being the "off position. The MX-401 should be operated in the switch position which produces the lowest amount of system hum. Speaker Jacks (SPEAKERS) The speaker outputs are stand- ard 1/4" phone jacks wired in parallel. Speaker cables (recom- mend at least #18 gauge wire) should be connected between the MX-401 and the speaker systems prior to applying power to the unit. Caution - The MX-401 should never be operated into less than a 4 ohm speaker load. Earth Terminal (GND) AC Power Cord The power cord is the three-wire type with proper grounding faci- lities. Caution - The ground pin should not be removed under any cir- cumstances. If the MX-401 must be used without proper ground- ing facilities, a suitable ground- ing adapter should be utilized. Operation of the MX-401 with proper grounding techniques will result in less system noise and greatly reduced shock hazard. Cord Wrap The cord wrap is provided for convenient storage of the power cord when the MX-401 is not in use. Caution - The power cord should always be completely removed from the cord wrap prior to operation of the u n i t . This will insure maximum cooling of the MX-401 For the same reason, adequate clearance should be maintained between the rear panel and any other surface (4-6 inches should do). The vents on the bottom and top of the MX- 401 are also provided for convec- tion cooling. These vents should be kept clear and open. Failure to do so may cause thermal shut- down of the u n i t . AC Fuse Warning - To avoid possible equipment damage and/or per- sonnel i n j u r y , the fuse should always be replaced with same type and rating. Using improper fuses will also void the warran- t y . The MX-401 should always be disconnected from AC outlet prior to changing fuses. If fuse repeatedly fails, the u n i t should be referred to qualified service personnel for repair. Fault Protection Table Fault Excessive current due to overloads. Short circuits (less than 0.4-ohm) Temperature rise of heat sink (more than 105°C) DC drift Protection Current limiter activates at less than 2 ohm. Current limiter activates, input signal is lowered, unit shuts down. Input signal is lowered. Unit shuts down. Input signal is lowered. Unit shuts down. Indication Compressor LED illuminates. Amp protection LED illuminates. Amp protection LED illuminates. Amp protection LED illuminates. Action Remove excessive loads. Minimum speaker loads 4 ohm. Check speaker lines/systems for shorts. Check for adequate ventilation. Refer to qualified service personnel. Restoration Automatic restoration after normal loads are obtained. Turn off power switch. Turn on into operational loads. Automatic restoration after temperature lowers (to 75° - 95° C) Automatic restoration after normal bias is regained. — 4 — Rear Panel

SPEAKER SYSTEM for foldback (Self powered speakers) From Speaker Jack on Rear Panel Low Z input should be connected with low impedance (50 ohm ~ 600 ohm) microphones Line Out KEYBOARD CASSETTE TAPE DECK for playback Line Out MUSICAL INSTRUMENT — 5 — Connection Examples

to the inputs of other equipment. 1. Properly match the impedances of the outputs and inputs. 2. Connect low impedance outputs to high impedance inputs. It goes without saying that not only input and output impedance matching, but also level matching should be taken into consideration. Each input channel of the MX-401 is provided with an Input Level Control that includes a negative feedback (NF) circuitry, so the usable signal level range is wide. Input impedances and levels are shown in the following table. INPUT SPECIFICATIONS *Sensitivity is the level required to produce a program out level of +4dB. *0dB is referenced to 0.775V RMS. All XLR Type connectors are electronic balanced. Phone jack is unbalanced. If the line going from one piece of equipment to another is long (more than 5m), we recommend that balanced outputs be connected to balanced inputs. As is described in the beginning of the Operating Instructions Manual, the connectors of the MX-401 are wired as follows: Pin 1 is ground (shield). Pin 2 is cold (low, minus). Pin 3 is hot (high, plus). — 6 — CONNECTION CH1 CH4 AUX GEQ PWR/AMP INPUT LOW Z HIGH Z ACTUAL LOAD IMPEDANCE OPEN 27k 30k 50k 10k FOR USE WITH NOMINAL 50 TO 250 MICRO- PHONES 27k OR LOWER IMP LINES 30k OR LOWER IMP, LINES 50k OR LOWER IMP, LINES 10k OR LOWER IMP, LINES SENSITIVITY* (PGM OUTPUT LEVEL +4dB) -60dB (0.78mV) -35dB (13.8mV) -20dB (77.5mV) +4dB (1.23V) +4dB (1.23V) CONNECTOR XLR TYPE NC3F PHONE JACK RCA PIN JACK PHONE JACK PHONE JACK PHONE JACK Input Connections

Total Harmonic Distortion 0.05% +4dB* at 1kHz. Hum and Noise (Open) Equivalent Input Noise -130dB* (20Hz ~ 20kHz) Equivalent Input Noise -133dB* (IHF A) All level Controls Minimum -110dB* (IHF A) PGM Master at MAX and all input level controls minimum -90dB* (IHF A) PGM Master at MAX and one input level control at MAX -70dB* (IHF A) Maximum Voltage Gain INPUT to PGM out 64dB INPUT to FB out 64dB INPUT to GEQ out 64dB AUX to PGM out 24dB Input EQ 50Hz ±15dB Shelving 20kHz ±15dB Shelving Equalization 63Hz ±12dB Peaking 2kHz ±12dB Peaking 250kHz ±12dB Peaking 8kHz ±12dB Peaking 1kHz ±12dB Peaking INPUT SPECIFICATIONS OUTPUT SPECIFICATIONS POWER AMPLIFIER SECTION Frequency Response +0, -1dB 15Hz to 30k Hz (150W RMS 4 Rated Power & Load 150W RMS (4 ) 110W RMS (8 Power Output at Clipping 1% THD, 1kHz 160W RMS (4 ) 115 W RMS ( Total Harmonic Distortion Less than 0.1% (200mW ~150W RMS, 20Hz~20kHz, 4 Typically below 0.05% Compresser Dynamic Range Greater than 26dB Hum and Noise At least 105dB S/N ratio, 20Hz~20kHz At least 109dB S/N ratio IHF-A weighted Damping Factor Greater than 200 [1kHz 8 Input Sensitivity +4dB* (1.23V) Input Impedance 10k Output Connector Phone Jack ×2 Power Requirement 300W Dimensions 494(W) × 180(H) × 304(D) (19.44 × 7.09 × 11.97) ins. Weight 10 kg (22 lbs) *0dB is referenced to 0.775V RMS. *Specifications are subject to change without notice. ) ) ) ) CONNECTION CH1 CH4 AUX GEQ PWR/AMP INPUT LOW Z HIGH Z ACTUAL LOAD IMPEDANCE OPEN 27k 30k 50k 10k FOR USE WITH NOMINAL 50 TO 250 MICRO- PHONES 27k OR LOWER IMP LINES 30k OR LOWER IMP, LINES 50k OR LOWER IMP,. LINES 10k OR LOWER IMP, LINES SENSITIVITY* (PGM OUTPUT LEVEL +4dB) -60dB (0.78mV) -35dB (13.8mV) -20dB (77.5mV) +4dB (1.23V) +4dB (1.23V) CONNECTOR XLR TYPE NC3F PHONE JACK RCA PIN JACK PHONE JACK PHONE JACK PHONE JACK CONNECTION PGM GEQ FB ACTUAL SOURCE IMPEDANCE 600 600 600 FOR USE WITH NOMINAL 600! OR HIGHER IMP. LINES 600 OR HIGHER IMP. LINES 600 OR HIGHER IMP. LINES OUTPUT LEVEL* NOMINAL +4dB (1.23V) +4dB (1.23V) +4dB (1.23V) MAX. BEFORE CLIP +20dB (7.75V) +20dB (7.75V) +20dB (7.75V) CONNECTOR PHONE JACK PHONE JACK PHONE JACK Specifications

HIGH Z IN. & INPUT EQ (set at "5") POWER AMP POWER BAND WIDTH POWER AMP COMPRESSOR GEQ POWER AMP T.H.D. vs POWER OUTPUT REVERBERATION FREQUENCY RESPONSE 304 (11.97") 494 (19.44") 180 (7.09") — 9 — Characteristics Diagrams Appearance