User manual BOSS MR250.4

[. . . ] This means that you can install four 8 Ohm speakers per channel, when using parallel wiring. Increasing the number of woofers per channel at low frequencies (below 100t-fz) produces an acoustic coupling effect. This acoustic coupling effect increases your power output by about 3dB per speaker. The current draw will also increase by about the same amount, so be sure you have enough current to run the amplifiers into a 2 Ohm load. [. . . ] Mark the location for the mounting hole screws by positioning the amplifier where you wish to install it. Use a scribe or mounting screw, inserted through each of the amp's mounting holes, to mark the mounting surlace. If the mounting surlace is carpeted, measure the hole centers and mark with a felt tip pen. 6, Connect all line inputs and outputs (if used) using high-quality cables. Be sure to observe proper polarity to avoid audio phase problems. Don't . misuse the level cont:rol_! Do not mistake the input level control for a volume control' It is designed ONLY to match the output level of your audio sOurce to the input level of your amplifier. 7. Connect the power ground terminal to tr. e closest point on the chassis of the marine vessel. Connect the remote terminal 10 the remote output of the head unit uSing 16 gauge (or heavier) wire. 8. Recheck all connections before powering up the amplifier. Do nol adiust this input level to maximum unless your input level requires il. Ignoring thElse instructions will result in an input overload to the amplifier, and excessive al:Jdio cjistortion. Sel all level controls to min, imum position, and set all crossover controls/switches to the desired frequency poillts. 4. Place the amplifier in position, and attach the amplifier to the mounting surlace securely uSing screws. 3. Connect an empty fJse holder within 18" (45 em) of the car battery. and run 8 gauge (or heavier) cable from this fuse to the amplifier location. 4. If multip:e amplifiers are being used in your system, either: · Run a separate pair of cables from the battery and a chassis ground pOint to each amplifier. -or · Run a #0 or #2 cable from the fuse holder at the battery to a distribution block at or near the amplifier's location, Then run separate cables from the amplifier to this distribution block and to independent chassis ground points. 10. Then s~t the volume control on the nead unit to about 3/4 volume, and adjust the amplifier's input level control(s) to just below the 'level of distortion. 11. Further fine tuning of the various controls may be necessary to obtain best results. Marine MOSFET Amplifier User's Manual· Marine MOSFET Ampli~Ol Usel'~ Manual· page 6 page 7 Low Level Input Wiring Low-level (RCA) input wiring is preferred for best audio performance, Always use a high-quality RCA cable for best audio pertormance. High Level Input Wiring The high level input(s) should only be used when your head unit lacks RCA outputs, If the RCA outputs are not present, connect the speaker outputs from the receiiver to the high level input connector of the amplifier. [. . . ] ) 0- +1SdS 25A o-+18dS 15Ax2 13-1116' x 10-31S' All specifications subject to change without notice. Squealing noise from speakers. Distorted sound. Check that the Input Level Contrails set to match the signal level of the head unit. Check for short circuits on the speaker leads. Amplifier gets very hot. [. . . ]