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TOA Electronics 1000 Series manual

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Table of contents for the manual

  • Page 1

    GRAPHIC EQUALIZER TOA 1 0 0 0 series E-1231 Operating Instructions CAUTION TO REDUCE T HE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. N O US ER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. TH E LIGHTNING FLASH WI TH ARROWHEAD W I T HI N A TRIANGLE I S INTENDED TO TE LL TH E USER THAT PARTS I N S I D E T HE P RODUCT A[...]

  • Page 2

    Contents Cautions General Description Features Front Panel Rear Panel Input/Output Connections Installation Precautions Applications Optional Matching Transformer Mo unting Performance Graphs Block Diagram Specifications Accessories Appearance 2 3 3 4 5 6 6 7 • 8 9 10 11 12 12 12 Cautions 1. Do n o t o p e r a t e t h e E-1231 from power ma ins w[...]

  • Page 3

    General Description T h e E-1231 is a single channel, 1 / 3 octave active graphic equalizer designed to allow clean, accurate audio equalization fo r stage, studio, o r c o mmercial applications. The E - 1 2 3 1 p rovi des 1 2 d B of boost or cut at each of its 2 8 frequencies, which ar e centered a t I S O 1 / 3 octave increments fr o m 3 1 . 5 H [...]

  • Page 4

    Front Panel Lowpass Filter S lop e S election S w itch This switch s ets t he lo wpass filter's p e r o ctave attenuation f o r either 6d B or 12dB. Pe a k Indicator LE D T he p e ak indicator L E D lights wh en either th e input or the output leve l reaches 3 dB below clipping. Input Level Control T hi s control adjusts th e input gain b y ±[...]

  • Page 5

    R ea r Panel AC Fu se Holder When replacing, b e sure to u s e th e fuse of specified rating an d type to avoid th e possibility of fire. Fuse rating 220-240V version 250V T80mA 1 2 0 V version 2 5 0 V 0 . 2 A A C Power Cord Ground Screw Terminal H u m c an result from a ground loo p to b e formed when the E -1231 i s c o nnected to other equipment[...]

  • Page 6

    Input/Output Connections I n p u t t er min al from m ixer, etc . Input terminal from mixer, etc. E-1231 E-1231 Power Amplifier Speaker System Installation Precautions Ground Loops I n a n y audio system, there a re numerous ways b y which ground loops c a n b e created. F or example, they ma y occur when the E-1231 i s m o unted i n a rack cabinet[...]

  • Page 7

    Applications Feedback Prevention Wh en the overall gai n of a sound system is incr eased, fee dback will occur a t frequencies where the system response ha s peaks. Suppose the system h as a n uneven frequency response like that shown i n the following diagram. Th e frequency a t which feedback will occur when gain is increased i s about 500Hz. I n[...]

  • Page 8

    Applications Equalization fo r music Th e Graphic Equalizer is designed not only f o r us e in p reventing feedback a n d equalizing uneven room frequency response to b e flat, b u t a l so fo r equalizing frequency response to your tas te s a n d prod u cing favorable sou n d for y ou . Fig.1 shows e a c h frequency band and its corresponding audi[...]

  • Page 9

    Optional Matching Transformer Mounting [CAUTION] THESE SERVICING INSTRUCTIONS A RE F OR USE B Y QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK D O N O T PERFORM AN Y SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING I NSTRUCTIONS UNLESS Y O U AR E QUALIFIED TO DO SO. REFER A LL SERVICING T O Q UALIFIED SERVICE PERSONNEL. Th e E-1231's in[...]

  • Page 10

    Performance Graphs Frequency Response (Each slider is set a t a max or mi n position) Frequency Response (ex . 800Hz slider) Frequency Response (ex. 630Hz, 800Hz, 1kHz slider) Hig h pass Filter Low pass Filter — 10 —[...]

  • Page 11

    Block Diagram — 11 —[...]

  • Page 12

    Specifications Frequency Response ±1dB, 20 Hz t o 20kHz Total Harmonic Distortion L es s t h a n 0.01% at 1 k H z , al l sliders a t 0 position, rated output Equalization Center Frequencies 31.5Hz t o 16kHz 31.5Hz, 40H z, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz, 16kH[...]