Koss ESP/950 User's Manual
Contents
1. 120 Volt AC Adapter 9VDC at 1A AD E 90 E 220 Volt AC Adapter for Europe Battery Supply Box Batteries not included Stereophone Extension Cord 3 5 mm to 3 5 mm Stereo Connector Cable Male to Male 3 5 mm to RCA Connector Cable Male to Male RCA to RCA Connector Male to Male Calf Skin Carrying Case 2 Attach the right and left earcups to the headband assembly by holding in the headband release button located at the inside of the earcup yoke See Figure 1 Insert the headband into the earcup yoke See Figure 2 3 Set the E 90 Energizer Amplifier On Off switch located on the front panel to Off 4 The the Acoustic Level Control to the full counterclockwise position 5 Connect the custom 5 pin rectangular plug from the stereophone to the input on the front of the E 90 Energizer Amplifier marked Phones 6 FOR HOME USE Plug the AC adapter into the jack marked 9VDC 1AMP Input located on the back panel of the E 90 Energizer Amplifier Plug the remaining end of the AC adapter into a live wall outlet FOR PORTABLE USE Open Portable Battery Case and insert 6 C size Batteries Batteries Not Included Close battery case Plug the jack connected to the battery case into the input on the back of the E 90 Energizer Amplifier marked VDC Input CONNECTING THE SOUND SOURCE 7 You may connect the E 90 Energizer Amplifier to your sound source with either the 3 5 mm to RCA connector cable or RCA to RCA connector cable Check2. your sound source for the connector cable required NOTE The RCA connectors are located on the back of the E 90 Energizer Amplifier When connecting RCA plugs the red plug is for the right channel the white plug is for the left channel The 3 5 mm connector is located on the front of the E 90 Energizer Amphlifier 8 Turn sound source on 9 Switch the power switch on the E 90 Energizer Amplifier to ON The LED on the front panel will iluminate 10 Adjust the volume level on the sound source as required 11 Slowly turn up Audio Level controls on the E 90 Amplifier until sound can be heard from the stereophones 12 Turn Acoustic Level counterclockwise again and position the stereophones on your head 13 Adjust Acoustic Level to desired level TROUBLE SHOOTING GUIDE No Power No Sound Check AC power outlet Check batteries for proper placement and power Check to see that sound source and E 90 Energizer Amplifier are ON Check Acoustic Level control on E 90 Turn clockwise Re check set up instructions LED Does Not Light Or Is A Solid Red Color Check battery power The LED on the E 90 Energizer Amphifier will flash red as batteries run down The LED will become a solid red when batteries are dead If battery voltage is too low the LED will not come on Hum Heard Through The Stereophone Check placement of the E 90 Energizer Amplifier and cables Placement near a source of 60 Hz noise such as a power amplifier or some hig
3. Print Close This Window The ESP 950 Electronic stereophone operates by passing a currentless electrostatic charge onto opposing capacitor plates which move an intervening almost mass less semi conductive diaphragm in conformance with the electrical signal from the music source The ESP 950 is powered by the E 90 Amplifier which connects to any music source including compact disc and digital audio tape players The E 90 uses Field Effect Transistors for high input impedance and outstanding signal sensitivity The E 90 Amplifier can be powered by either standard household current or the battery pack For the first time you can enjoy state of the art audiophile sound in a portable stereophone The ESP 950 is covered by the Koss No Questions Asked Lifetime Limited Warranty If anything ever happens to any part of your ESP 950 System Koss will repair or replace that part no questions asked IMPORTANT To maximize the reproduction quality of the ESP 950 and protect your sound investment please read and follow the set up instructions carefully SET UP INSTRUCTIONS 1 Carefully unpack your ESP 950 Electrostatic Stereophone System to insure that the system is complete and intact The ESP 950 Electrostatic Stereophone System includes ESp 950 Stereophone The earcup and headband assemblies are separate to allow convenient and protective packaging To assemble refer to step 2 of the set up instructions E 90 Energizer Amplifier AD E 90
4. e of earcup Approximately 150 mm h x 100 mm w x 40 mm d including cushions Cushions Large foam filled leatherette type for high ambient noise isolation and conformance to facial structure Headband Extendable stainless steel band with self adjusting pivoting yokes and headband release mechanism Headband Cover Wide leatherette style vinyl with 12 mm thick polythylene foam padding Yokes Horizontal and vertical pivoting with integral headband lock and detach mechanism for convenient storage Weight 12 45 oz 353 gm Cord Length 47 inches 182 9 cm Extension cord length 72 inches 182 9 cm Electroacoustical Specifications Frequency response 8 Hz to 35 000 Hz Sensitivity 104 dB 100 Vrms differential input a 1 kHz Diaphragm radiating surface area 7 sq in 45 6 sq cm Diaphragm Ultra low mass 1 5 micron C grade polyester film electronbeam coated with a proprietary semiconductive material 250 A thick Acoustic Design principal Circumaural open air design incorporating minimal acoustic damping E 90 Energizer Amplifier Physical Specifications Dimension 65mm h x 110 mm w x 155 mmd Weight 17 oz 482 gm Electrical Specifications Frequency response 1 6 Hz to 50 000Hz 3dB points 100 vrms differential output Distortion THD NOISE 0 001 at 1kHz and 100 Vrms differential output Input Impedence 100k ohms Input level 1 Vrms for full power output Voltage Amplification 60 dB Audio output voltage 600 Vrms d
5. h intensity lamps may cause 60Hz hum Relocate E 90 Untt Check sound source components Check the interconnecting cables for the poor connection NOTE Due to the ESP 950 s low frequency bandwidth hum not normally heard from your stereo system may not become apparent Sound From Only One Channel The Acoustic Level control on the E 90 Energizer Amplifier is a dual concentric unit allowing balance adjustment between right and left channels Turn both sections of the knob fully counterclockwise to a desired listening level Check the interconnecting cables for a poor connection NOTE Before checking for a poor connection turn unit OFF Check source components for right and left signals How To Care For Your ESP 950 Stereophones Avoid any foreign materials from entering the earcups of the ESP 950 or the connector openings of the E 90 Energizer Amplifier To avoid potential electrical shock do not operate the ESP 950 and E 90 unit in a damp rainy or moisture filled environment To clean your unit turn the E 90 unit OFF and disconnect from any power source AD or DC Gently clean the earcushions and surfaces of the ESP 950 and E 90 unit with a slightly dampened soft cloth Allow any moisture to completely evaporate before re connecting and operating the system Never operate the system in the E 90 unit or ESP 950 earcups have been dissembled or mechanically tampered with SPECIFICATIONS ESP 950 Physical Specifications Siz
6. ifferential 2300 Vrms push pull with soft limiting Channel Separation 80 dB at 1 kHz 100 Vrms differential output Signal to Noise 100 dB at100 Vrms output Bias voltage supply 600 VDC Signal Polarity Absolute Phase non inverting Volume control Dual concentric continuous audio taper high quality potentionmeter with split shaft for balance Indicator Combination Power ON and battery condition dual color LED Switches Power ON OFF rocker switch Input jacks a RCA type L amp R b 3 5 mm stereo c AC DC adapter Battery pack Power consumption 320 mA DC current at normal listening levels
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