-4X2 4-CHANNEL STEREO REFERENCE HEADPHONE AMPLIFIER PRODUCT MANUAL 1
THANK YOU FOR CHOOSING POLSEN. The Polsen HPA-4X2 Stereo Reference Headphone Amplifier is a compact and powerful headphone amplifier that can withstand the rigors of professional use. It is ideal for studio recording, stage monitoring, or any application where multiple headphone connections are needed.
Among the benefits you’ll enjoy: P R E C AU T I O N S • • • • • • Please read and follow these instructions and keep this manual in a safe place. Durable and compact. Easy to use.
OVERVIEW 7. 1. Volume knobs 2. ¼" TRS stereo input jack 1. 6. 3. 3. RCA inputs 4. ¼" TRS stereo headphone output jacks 5. Power LED 5. 9. 4. 6. Stereo/mono switch 10. 7. DC 12V power input 8. DC 12V/150mA power supply 9. 1/8" (3.5 mm) stereo mini to 1/4" TRS stereo adapter (4) 10. Stereo mini male to stereo mini male cable 4 8. 2.
O P E R AT I N G I N S T R U C T I O N S Connecting an input device Plug the 12V DC power cord into the power supply of the HPA-4X2. The LED will light up. For line level output like a mixer or audio amplifier: Cable needed: ¼" TRS stereo male to ¼" TRS stereo male cable (not included). Connect the output of your mixer or amplifier to the ¼" TRS stereo input jack on the back panel of the HPA-4X2.
For audio from a media player or smartphone: Cable and adapter needed: Stereo mini male to stereo mini male cable (included) Stereo mini to ¼" TRS stereo adapter (included) Connect the mini plug cable to the output of your device. Attach the ¼" TRS –mini plug adapter to the other mini plug, and insert it into the ¼" input jack on the back panel of the HPA-4X2.
Monitoring Plug the ¼" TRS stereo plug of your headphones into the headphone output jack on the front panel of the HPA-4X2. Adjust the volume of each headphone with the volume knobs. If your headphones have a 3.5 mm mini plug, use the ¼" TRS – mini plug adapter to connect to the headphone outputs of the HPA-4X2. Caution: Do not plug a ¼" TS mono plug into the headphone outputs. Doing so may permanently damage the HPA-4X2. Use only ¼" TRS stereo plugs.
Stereo/Mono switch: The stereo/mono switch on the rear panel of the HPA-4X2 should be set to the STEREO position for ordinary use. This switch allows you to set the HPA-4X2 for stereo or mono operation. In recording scenarios when content is recorded on two discreet channels, setting the switch to MONO combines the sound of both channels in your headphones. (Note: keeping the switch in the STEREO position will play each channel separately in either side of your headphones.
Using the Link Feature: TRS INPUT The HPA-4X2 circuitry allows daisy chaining headphone amplifiers in case more than four headphone connections are needed. To link the HPA-4X2 to another headphone amplifier do the following: If using a ¼" stereo TRS for input: Connect the RCA plugs on the back panel of the HPA-4X2 to the input of the daisy-chained headphone amplifier.
S P E C I F I C AT I O N S NUMBER OF CHANNELS 4 O U T P U T I M P E DA N C E minimum 10 Ω per channel I N P U T C O N N E C T I O N S 1 x ¼" TRS phono master input 1 x L,R RCA S I G N A L-T O - N O I S E R AT I O >98 dB O U T P U T C O N N E C T O R S 4 x ¼" TRS phono headphone outputs T O TA L H A R M O N I C D I S T O R T I O N (THD) <0.007% M A X I M U M I N P U T L E V E L +14 dBV P O W E R 12V DC, 150mA M A X I M U M O U T P U T L E V E L 22 dB per channel W E I G H T 10.4 oz.
TROUBLESHOOTING Problem No sound Solution Make sure headphones are completely plugged in. Make sure the volume levels are turned up. LED light is not lit Noise or hum Make sure the amplifier is receiving an input signal. Make sure the 12V DC adapter is plugged into the outlet, and the connector is completely inserted into the power supply on the back panel of the HPA-4X2. The noise might be coming from a faulty input device. Check if there’s a faulty ground in the signal chain.
O N E -Y E A R L I M I T E D WA R R A N T Y This Polsen product is warranted to the original purchaser to be free from defects in materials and workmanship under normal consumer use for a period of one (1) year from the original purchase date or thirty (30) days after replacement, whichever occurs later.
