Fecr noise reduction b frequency response

Listado fecr noise reduction b frequency response

  • 8 cm/s heads: 1 x record/playback, 1 x erase motor: fg servo dc tape type: type i, fecr noise reduction: b frequency response: 25hz to 16khz (fecr tape) signal to noise ratio: 67db (dolby b) wow and flutter: 006% input: 70mv (line), 02mv (mic) output: 04v (line) dimensions: 430 x 171 x 322mm weight: 8type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 4

    $ 2980

  • 76 cm/s heads: 1 x combination record/playback, 1 x erase motor: 2 x reel, 1 x capstan tape type: type i, cro2, fecr noise reduction: b frequency response: 35hz to 19khz (fecr tape) signal to noise ratio: 62db (dolby b) wow and flutter: 0type: 3-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 441v (line) semiconductors: 98 x transistors, 112 x diodes, 4 x fet, 17 x ic dimensions: 440 x 255 x 225mm weight: 925mv (mic) output: 006% total harmonic distortion: 15% input: 70mv (line), 0

    $ 9800

  • 75 cm/s heads: 1 x record/playback, 1 x erase motor: 4-pole induction tape type: type i, fecr, cro2 noise reduction: b frequency response: 30hz to 17khz (fecr tape) signal to noise ratio: 47db wow and flutter: 0775v (line) dimensions: 440 x 116 x 229mm weight: 65% input: 50mv (line), 008% total harmonic distortion: 1type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 4cassettera deck akai gxc-39d japon impecable cassettera deck akai gxc-39d - hi fi stereo japon impecable 100% funcional3mv (mic) output: 0

    Argentina

  • 76 cm/s heads: 1 x record/playback, 1 x erase motor: 1 x dc servo control tape type: type i, fecr, cro2 noise reduction: b frequency response: 30hz to 16khz (cr02 tape) signal to noise ratio: 66db (dolby b) wow and flutter: 006% total harmonic distortion: 2% input: 80mv (line), 025mv (mic) output: v (line) dimensions: 462 x 325 x 125mm weight: 8kgcasetera lenco c funciona, teclas de rec y play sueltas specifications type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 4

    $ 400

  • 75 cm/s heads: 1 x record/playback, 1 x erase motor: electronically controlled dc tape type: type i, fecr, cro2 noise reduction: b frequency response: 30hz to 17khz (cr02 tape) signal to noise ratio: 62db (dolby b) wow and flutter: 07% input: 64mv (line), 045v (line) semiconductors: 38 x transistors, 23 x diodes, 2 x fet dimensions: 420 x 150 x 350mm weight: 823mv (mic) output: 05kg year: meses de garantia07% total harmonic distortion: 1specifications: type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 4

    $ 6500

  • 75 cm/s heads: 1 x record/playback, 1 x erase motor: 1 x playback/record, 1 x fast wind tape type: type i, fecr, cro2 noise reduction: b frequency response: 20hz to 17khz (cr02 tape) signal to noise ratio: 63db (dolby b) wow and flutter: 02mv (mic) output: 007% total harmonic distortion: 18kg year: meses de garantiaspecifications: type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 45% input: 60mv (line), 045v (line) semiconductors: 63 x transistors, 41 x diodes, 4 x fet, dimensions: 420 x 165 x 349mm weight: 11

    $ 6500

  • 75 cm/s heads: 1 x combination record/playback, 1 x erase motor: 1 x reel, 1 x capstan tape type: type i, fecr, cro2, metal noise reduction: b frequency response: 20hz to 19khz (metal tape) signal to noise ratio: 69db (dolby b) wow and flutter: 0type: 3-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 445v (line) semiconductors: 76 x transistors, 84 x diodes, 13 x ic dimensions: 420 x 187 x mm weight: 1004% total harmonic distortion: 12% input: 60mv (line), 03mv (mic) output: 0

    $ 8900

  • 75 cm/s heads: 1 x record/playback, 1 x erase motor: electronically controlled dc tape type: type i, fecr, cro2 noise reduction: b frequency response: 30hz to 17khz (cr02 tape) signal to noise ratio: 62db (dolby b) wow and flutter: 07% input: 64mv (line), 045v (line) semiconductors: 38 x transistors, 23 x diodes, 2 x fet dimensions: 420 x 150 x 350mm weight: 823mv (mic) output: 0features include equalizer and bias switches, ferrite solid heads, cr02 tape detector and indicator, rewind memory and peak indicatorspecifications type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 4marcapioneer modeloct-f tipo de cassetterasingular cantidad de cabezas2 description the pioneer ct-f is a front access, stereo cassette deck with vertical cassette holding07% total harmonic distortion: 1

    $ 3980

  • 76 cm/s heads: 1 x record/playback, 1 x erase motor: 1 x reel, 1 x capstan tape type: type i, cro2, metal noise reduction: b frequency response: 30hz to 19khz (metal tape) signal to noise ratio: 70db (dolby b) wow and flutter: 041v (line) dimensions: 440 x 118 x 285mm weight: 625mv (mic) output: 08kg finish: black or silver 3 meses de garantia7% input: 70mv (line), 0specifications: type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 404% total harmonic distortion: 0

    $ 3800

  • 8 cm/s heads: 1 x record/playback, 1 x erase motor: electrical governor dc tape type: type i, cr02, metal noise reduction: b frequency response: 20hz to 17khz (metal tape) signal to noise ratio: 66db (dolby b) wow and flutter: 04v (line) dimensions: 430 x 122 x 210mm weight: 325mv (mic) output: 0caractertistias: deck technics m6 mk3 country: made in japan year: ’s type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 405% input: 60mv (line), 09kg zona: avellaneda (a 2 cuadras del puente gerli y a 12 cuadras del shoping alto avellaneda)

    $ 1000

  • 8 cm/s heads: 1 x record/playback, 1 x erase motor: electrical governor dc tape type: type i, cro2, metal noise reduction: b frequency response: 20hz to 18khz (metal tape) signal to noise ratio: 67db (dolby b) wow and flutter: 07v (line) dimensions: 430 x 119 x 282mm weight: 5kg05% input: 60mv (line), 025mv (mic) output: 0deck technics m-24 deck technics m-24 type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 4

    Argentina

  • 8 cm/s heads: 1 x playback, 1 x record/playback, 1 x erase motor: 2 x dc servo tape type: type i, cr02, metal noise reduction: b frequency response: 20hz to 18khz (metal tape) signal to noise ratio: 67db (dolby b) wow and flutter: 04v (line) dimensions: 430 x 108 x 232mm weight: 4kgtechnics dobre casetera modelo rs-b11w usado muy buen estado type: double compact cassette deck track system: 4-track, 2-channel stereo tape speed: 407% input: 60mv (line), 1mv (mic) output: 0

    Argentina

  • 8 cm/s heads: 1 x record/playback, 1 x erase motor: 1 x reel, 1 x capstan tape type: type i, cro2 noise reduction: b frequency response: 20hz to 18khz (cr02 tape) signal to noise ratio: 62db (dolby b) wow and flutter: 0deck technics rs-671 su-distribuidor specifications us type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 44kg year: 1976 saludos063% input: 60mv (line), 0su-distribuidor in the web42v (line) dimensions: 410 x 140 x 330mm weight: 93mv (mic) output: 0

    Argentina

  • 8 cm/s -heads: 1 x combination record/playback, 1 x erase -motor: electrical governor dc -tape type: type i, fecr, cro2, metal -noise reduction: b -frequency response: 20hz to 20khz (metal tape) -signal to noise ratio: 67db (dolby b) -wow and flutter: 0cassette deck technics m260, 3 head, con service, japandeck technics m260, la misma se encuentra con un service reciente, se le cambiaron las correas y se le ajusto la velocidad, funciona perfecto, graba y reproduce muy bien05% -input: 60mv (line), 03kg -finish: black, silver no hago envios, se retira en microcentro de lunes a viernes de 9:30am a 5:30pm25mv (mic) -output: 07v (line) -dimensions: 430 x 119 x 282mm -weight: 5especificaciones: -type: 3-head, single compact cassette deck -track system: 4-track, 2-channel stereo -tape speed: 4

    Argentina

  • 8 cm/s heads: 1 x record/playback, 1 x playback, 1 x erase motor: 2 x reel, 2 x capstan tape type: type i, cr02, metal noise reduction: b, c, hx pro frequency response: 20hz to 17khz (metal tape) signal to noise ratio: 74db (dolby c) wow and flutter: 05v (line) dimensions: 430 x 136 x 285mm weight: 4specifications type: auto reverse, double compact cassette deck track system: 4-track, 2-channel stereo tape speed: 41% input: 100mv (line) output: 0

    $ 2500

  • 76 cm/s heads: 1 x record/playback, 1 x erase motor: dc servo tape type: type i, cro2, metal noise reduction: b, c, hx pro frequency response: 20hz to 19khz (metal tape) signal to noise ratio: 74db (dolby c) wow and flutter: 0yamaha natural sound kx 393 cassette player (no permutas) especificaciones: type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 407% total harmonic distortion: 08% input: 100mv (line) output: 057v (line) dimensions: 435 x x 283mm weight: 4

    $ 3200

  • 5khz (metal tape) signal to noise ratio: 76db (dolby c) wow and flutter: 075 cm/s heads: 1 x record/playback, 1 x playback, 1 x erase motor: 2 x dc servo tape type: type i, cro2, metal noise reduction: b, c, hx pro frequency response: 20hz to 16funciona perfectoen muy buen estado, solo hay que cambiarle las correas dado que no se usa un buen tiempoespecificaciones: type: auto reverse, double compact cassette deck track system: 4-track, 2-channel stereo tape speed: 41% total harmonic distortion: 08% input: 100mv (line) output: 05v (line) dimensions: 420 x 125 x 250mm weight: 4doble casettera doble casettera pioneer ct-w504r

    Argentina

  • frequency response: 63 hz to 18 khz (metal tape)heads: 2 x reading / recording, 2 x erase tape type: type l, cr02, metal noise reduction: b, c, hx pro15 % total harmonic distortion: 2track system: stereo, 4 tracks and 2 channels5 % input: 300 mv (line)wow and flutter: 0type: compact double cassette deck, auto-reversesignal/noise ratio: 79 db (dolby c)regulador de velocidad funcionando oksize: 483 x 140 x 323tascam 302 - cassettera doble - impecable - funciona 100 % impecable estado, las dos cassetteras graban y reproducen

    Argentina

  • 8 cm/s heads: 1 x record, 1 x playback, 1 x erase motor: 1 x reel, 1 x capstan, 1 x mechanism tape type: type i, cro2, metal noise reduction: b, c frequency response: 20hz to 21khz (metal tape) signal to noise ratio: 72db (dolby c) wow and flutter: 0035% total harmonic distortion: 08% input: 50mv (line) output: 05v (line) dimensions: 430 x 100 x 320mm weight: 5nakamichi dr1 nakamichi dr1 specifications type: 3-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 44kg year: 1992 price: gbp £780 (1992)

    Argentina

  • 8 cm/s heads: 1 x record, 1 x playback, 1 x erase motor: 2 x reel, 2 x capstan tape type: type i, cro2, metal noise reduction: b, c frequency response: 20hz to 17khz  (metal tape) signal to noise ratio: 74db  (dolby c) wow and flutter: 0casetera technics stereo cassette deck rs-tr373 casetera technics usadadebido a eso cuando uno pone un cassette le cuesta al principio pero al rato ya se escucha bienmucho tiempo sin uso seguramente precisa limpieza de cabezales1% input: 100mv (line) output: 0exelente estadospecifications type: auto reverse, double compact cassette deck track system: 4-track, 2-channel stereo tape speed: 45v (line) dimensions: 430 x 136 x 285mm weight: 4

    Argentina

  • 8mv (mm), 180mv (line) signal to noise ratio: 50db (mm), 50db (line) output: 180mv (line), 1sintoamplificador marantz b excelente calidad de sonido, transistorizado, made in japan, funcionando, escucho ofertas de contado! tuning range: fm, mw power output: 29 watts per channel into 8¿ (stereo) frequency response: 10hz to 40khz total harmonic distortion: 01% damping factor: 35 input sensitivity: 15v (pre out) speaker load impedance: 4¿ (minimum) semiconductors: 3 x ic, 46 x transistors, 30 x diodes, 1 x fet dimensions: 440 x 137 x 365mm weight: 11

    $ 11000

  • 8 cm/s heads: 1 x record/playback, 1 x erase motor: fg servo controlled dc tape type: type i, cro2 noise reduction: b signal to noise ratio: 55db (dolby b) wow and flutter: 025% total harmonic distortion: 22% input: 87mv (line), 0casetera deck teac cx-270 japonesa 220 vol35mv (mic) output: 0especificaciones: type: 2-head, single compact cassette deck track system: 4-track, 2-channel stereo tape speed: 4436v (line) dimensions: 410 x 140 x 295mm peso: 6kg año: 1979 aceptamos mercado pago hacemos envios a todo el pais somos electrovarios

    Argentina

  • Dolby sistem b - c tape type: type i, cro2, metal noise reduction: b, c, hx pro autofader rec level - hifi engine van cassetes de regalo $ los equipos se prueban antes de retirar soy particularmade in japan rodillo y cabezal poco uso como se ve en la fotocassetera kenwood kx-550 autoreverse - impecable funcionamiento y estetico - 220vol

    $ 1300

  • Dolby sistem - made in japan tape type: type i, cro2, metal noise reduction: b, c, hx pro autofader rec level - hifi engine van cassetes de regalo $ los equipos se prueban antes de retirar soy particularcassetera kenwood kx-550 autoreverse - impecable funcionamiento y estetico - 220volrodillo y cabezal poco uso como se ve en la foto

    $ 1300

  • The dd-9 thus provides switches for selecting either no noise reduction, anrs/dolby-b, or dolby-cnet) jvc dd-9 main features: noise reduction dolby-b noise reduction dolby-c noise reduction mpx filter anrs noise reduction super anrs noise reduction head configuration 3 head design 4 track / 2 channel transport sìngle capstan transport direct drive (capstan) mechanical tape loading auto shutoff quartz controlled transport tape chrome tape capability normal tape capability metal tape capability manual tape type selection exterior front loading orientation right silver finish display 4-digit digital counter peak hold digital peak-reading meters multi color peak-reading meters meters peak / vu switchable calibration auto bias calibration auto equalizer calibration auto level calibration connectivity 2 mono microphone inputs headphones rca input/output connectors wired remote control operation timer recording/playback real-time tape monitoring record mute full logic transport control stop watch preamplifier record level balance control output-level control master record level control general stereo rear controls voltage switchable (rear) indicators record cassette back lighting dolby b dolby c fast forward play pause rewind metal tape record mute source/tape speed 1¿ ips – 4through virtually doubling the amount of noise reduction provided by the normal dolby-b system (or its jvc equivalent, anrs), c-type dolby is designed to meet the needs of today’s wider-dynamic-range recordings without losing compatibility with existing dolby-b-encoded tapesthe record- and playback-head elements, both housed in a single casing, are made from sen-alloy and have tapered („x-cut”) pole pieces to reduce variations in low-frequency response(review from hifi-classic220v tomo audio en parte de pagojvc dd-9 is a two-motor, three-head cassette deck that includes, among its many advanced features, the new dolby-c noise-reduction systemthe capstan of the dd-9 is direct-driven by a quartz-locked servomotor, and a separate dmotor is used to turn the reelsatencion averiguar antes de comprar por la forma de pago76 cm/s electronics record protection power requirements alternating currentdeck jvc dd-9 3 cab top audiofila legendaria leer deck jvc dd-9 3 cab auto calibracion 2 motores tope de linea audiofila legendaria made in japan, perfecto funcionamiento solo tiene muy pequenos detalle en su serigrafiay por motivos de pasadas experiencia por maltrato, envios no hago, habia enviado equipos en perfectas condiciones y devolvieron golpeado o con averias, por esta razon envios no hago, el retiro tiene que ser personalmente

    Argentina

  • The dd-9 thus provides switches for selecting either no noise reduction, anrs/dolby-b, or dolby-cnet) jvc dd-9 main features: noise reduction dolby-b noise reduction dolby-c noise reduction mpx filter anrs noise reduction super anrs noise reduction head configuration 3 head design 4 track / 2 channel transport sìngle capstan transport direct drive (capstan) mechanical tape loading auto shutoff quartz controlled transport tape chrome tape capability normal tape capability metal tape capability manual tape type selection exterior front loading orientation right silver finish display 4-digit digital counter peak hold digital peak-reading meters multi color peak-reading meters meters peak / vu switchable calibration auto bias calibration auto equalizer calibration auto level calibration connectivity 2 mono microphone inputs headphones rca input/output connectors wired remote control operation timer recording/playback real-time tape monitoring record mute full logic transport control stop watch preamplifier record level balance control output-level control master record level control general stereo rear controls voltage switchable (rear) indicators record cassette back lighting dolby b dolby c fast forward play pause rewind metal tape record mute source/tape speed 1¿ ips – 4through virtually doubling the amount of noise reduction provided by the normal dolby-b system (or its jvc equivalent, anrs), c-type dolby is designed to meet the needs of today’s wider-dynamic-range recordings without losing compatibility with existing dolby-b-encoded tapesthe record- and playback-head elements, both housed in a single casing, are made from sen-alloy and have tapered („x-cut”) pole pieces to reduce variations in low-frequency response(review from hifi-classic220v tomo audio en parte de pagojvc dd-9 is a two-motor, three-head cassette deck that includes, among its many advanced features, the new dolby-c noise-reduction systemthe capstan of the dd-9 is direct-driven by a quartz-locked servomotor, and a separate dmotor is used to turn the reelsatencion averiguar antes de comprar por la forma de pago76 cm/s electronics record protection power requirements alternating currentdeck jvc dd-9 3 cab top audiofila leer deck jvc dd-9 3 cab auto calibracion 2 motores tope de linea audiofila legendaria made in japan, perfecto funcionamiento solo tiene muy pequenos detalle en su serigrafiay por motivos de pasadas experiencia por maltrato, envios no hago, habia enviado equipos en perfectas condiciones y devolvieron golpeado o con averias, por esta razon envios no hago, el retiro tiene que ser personalmente

    Argentina

  • Audifono recargable nuevo audífono con función de reducción de ruidos (noise reduction) mini audífono bte recargable amplificador de voz control de volumen bajo nivel de ruido y baja distorsión diseño bte (detrás de la oreja), cómodo de usar ayuda a obtener un sonido más claro y una mejor audición conmutador n-h: n para el modo de trabajo normal; h para reducir el ruido de baja frecuencia volumen ajustable, con 4 tipos de modos de volumen batería de litio recargable de alta capacidad incorporada haga su pedido recibalo y paguelo en su casa hacemos envios a todo el pais paga envio mas audifono specification: · max sound output: 130db±5db · sound gain: 38db±5db · total harmonic wave distortion: ≤5% · frequency range: hz · input noise: ≤30db · working voltage: dc 36cm · weight: 9g puede contactarse por whatsapp para solucionar dudas whatsapp + celular 261 mail audifono recargable nuevo audífono con función de reducción de ruidos (noise reduction) mini audífono bte recargable amplificador de voz control de volumen bajo nivel de ruido y baja distorsión diseño bte (detrás de la oreja), cómodo de usar ayuda a obtener un sonido más claro y una mejor audición conmutador n-h: n para el modo de trabajo normal; h para reducir el ruido de baja frecuencia volumen ajustable, con 4 tipos de modos de volumen batería de litio recargable de alta capacidad incorporada haga su pedido recibalo y paguelo en su casa hacemos envios a todo el pais paga envio mas audifono specification: · max sound output: 130db±5db · sound gain: 38db±5db · total harmonic wave distortion: ≤5% · frequency range: hz · input noise: ≤30db · working voltage: dc 37v · input: v, hz, 150ma · output: 5v / 500ma · color: beige · size: 5cm x 5cm x 16cm · weight: 9g puede contactarse por whatsapp para solucionar dudas whatsapp + celular 261 mail

    $ 2500

  • 8o, vol at 0db) frequency response ±01w/8o, a-wtd) preamplifier section frequency response ±01w/8o, a-wtd) total harmonic distortion + noise (thd + n) 4v tuner section am section tuning range 530khz - khz (120v version, 10khz steps) 531khz - khz (230v version, 9khz steps) usable sensitivity 55dbµv signal/noise ratio 38db total harmonic distortion loop sensitivity 20db s/n 66dbµv fm section tuning range mhz - mhz usable sensitivity mono signal/noise ratio mono stereo 60db 55db total harmonic distortion mono stereo % channel separation 30dbµv rds decode sensitivity 28dbµv general standby power unit dimension (wxhxd) - gross ** (includes feet, knobs and terminals) 435 x 197 x 438mm x x ? net weight 25sonido paul sintoamplificador nad td 78dbw) ihf dynamic power 8ohms 4 ohms 230w 320w total harmonic distortion at rated power (thd + n) 60 input sensitivity and impedance 11 dts dolby 220v 7x120w importador directo, 220v, nuevo en caja cerrada caracteristicas: mplifier section t 787 ftc 200w full disclosure power (all channels driven simultaneously) 7 x 120w (2020hz-20khz) signal/noise ratio >-100db (ref1khz, 20hz-20khz) signal/noise ratio >93db (refrated power at 8o, a-wtd) >83db (ref6lb) shipping weight 29

  • 5 db (20 hz to 48 khz), refer to the nominal output level @ 1 khz, gain knob: min hum & noise level equivalent input noise -128 dbu (mono input channel, rs: 150o, gain knob: max) residual output noise -102 dbu (stereo out, stereo master fader: min) crosstalk -78 db power requirements ac v, hz power consumption 30 w dimensions w 444 mm (17300 msec eq high gain: +15 db/-15 db, frequency: 10 khz shelving eq mid gain: +15 db/-15 db, frequency: mono 250 hz – 5 khz peaking eq low gain: +15 db/-15 db, frequency: 100 hz shelving peak led led turns on when post eq signal reaches 3 db below clipping general specifications total harmonic distortion dbu (20 hz to 20khz), gain knob: min, dbu (1khz), gain knob: min frequency response +025 msec, release time: approxaudionet distribuidor oficial de las mejores marcas de audio yamaha mg16 consola mezcla de 16 canales mesa de mezclas de 16 canales hasta un máximo de 10 entradas de micro/16 de línea (8 mono + 4 estéreo) 4 buses de grupo + 1 bus estéreo 4 envíos aux (incluyendo envío para efectos) preamplificadores de micro “d-pre” con circuito darlington invertido compresores de mando único interruptor de atenuación (pad) en las entradas mono alimentación phantom +48 v salidas xlr balanceadas fuente de alimentación interna universal para poder utilizar la mesa en cualquier parte del mundo kit para montaje en rack incluido chasis metálico dimensiones (ancho x alto x profundo): 444 mm x 130 mm x 500 mm peso neto: 6,6 kg outline i/o phantom power +48 v input channels mono[mic/line] 8 mono/stereo[mic/line] 2 stereo[line] 2 output channels stereo out 2 monitor out 1 phones 1 aux send 4 group out 4 bus stereo: 1, group: 4, aux: 4 input channel function pad 26 db (mono) hpf 80 hz, 12 db/oct (mono/stereo: mic only) comp 1-knob compressor (gain/threshold/ratio) threshold: +22 dbu to -8 dbu, ratio: 1:1 to 4:1, output level: 0 db to 7 db attack time: approx

  • noise level: -102dbuit features an extremely flat frequency response and ultralow noise for superior audio qualityfrequency response: 10hz to 90khzan internal battery is automatically decoupled when phantom power is usedsolid metal chassis and 4 sturdy rubber legs protect the ultra-di from damage on tourbehringer ultra-di-100 - nuevo (para guitarras, bajos etcbalancea la señal)- a estrenar nueva!!!!!! the behringer ultra-di di-100 direct box puts an end to hum and impedance problems

    $ 1850

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