User manual BOSS MR250.4

[. . . ] If something is missing, contact the store where you purchased the player. · Marine amplifier · HIgh input wire with connector · Four (4) mounting screws · MOSFET PWM (Pulse Width Modulated) Power Supply · 2 Ohm stable stereo operation with output power increase · Thermal and speaker short protection · Soft turn-on cirCUit · Remote turn-on/turn-off circuit · Variable input gain control · Variable low and fixed high pass crossovers · Variable bass boost (0 to +18dB) · Exclusive protective coating on PC board to provide damage from humidity · Gold plated RCA low level and high level inputs · LED power and protection indicators · Silver anodized heatsink · Remote subwoofer level control Your new !9~1 Marine amplifier features the following: · Class A-B operation · Bridgeable outputs · TriMode capable About 2 Ohm operation desig'n~70 operate efficiently at loads down to 2 Ohms. 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. [. . . ] Connect all speakers, following the diagrams in this manual. 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. Insert tuse(s) into the battery fuse holder(s). 1. Connect the power ground terminal to tr. e closest point on the chassis of the marine vessel. Keep tris ground wire to less than 39" (100 em) h length. 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. It can also cause the protectiolfl circuit to . engage. 9. Sel all level controls to min, imum position, and set all crossover controls/switches to the desired frequency poillts. 4. Drill pilot holes in the mounting surface for the mounting screws. 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. Then COllnect the fuse holder to the "BAn+. 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. Each (+) cable must have its own inline fuse. -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. Power up the head unit and the amplifier. 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. Be sure to observe polarity to avoid audio phase problems, NOTE: Do not connect BOTH the high !evel and low level inputs from your receiver to your amplifier at the same time! 2-Channel Amplifier MR400. 2 , J NOTE: Do not connect BOTH the high level and low level inputs from your receiver to your amplifier at the same timet 2-Channel Amplifier MR400. 2 1"'"' -----" 7 To Audio Outputs of head unit or signal processor l+ l~ R· R. . . Optlonnl remote ulJwoofer level conlrQI (sold ~epamtelvl IObO;;;:;z;x::) I To Speaker Terminals of head unit Optional remote ubwoofcr lellel contro (sold separately) 4-Channel Amplifiers MR250. 4 Optlonal remote "ubwoofer level control (sold separately) 4-Channel Amplifier MR250. 4 @ '\ ! TO FRONT Audio Outputs (1]) ( To Speaker Terminals of head unit of head unit or signal processor 10l:=J I To REAR Audio Outputs of headl unil or signal processor I01 ~~ ~~ c. ;: ;~ [] Optlonlll remote subwooler level control ~ (sold se!l"arately) 1::Ic:::JCJC:::lt::lO Ma"ne MOSFET AmpRfier User's Manual· p8ij8 8 Marlne MOSFET Amplifier User"s Manual" page 9 Power and Speaker Wiring I 2-Channel Amplifier MR400. 2 Power and Speaker Wiring 2·, Chanhel Amplifie!i "'11400. 2 Channel Mode Two Tri-mode operation allows you to connect this amplifier to a pair- of main speakers plus a sUlbwoofer on one pair of output channels. [. . . ] Clleck that all crossover frequencies are properly set. Check for short circuits on the speaker leads. Amplifier gets very hot. Engine noise (static type) Engine noise (alternator whine) CllfICk that the minimum speaker Impedance tor the amp model Is correct. Check thaI there is good air circulatJon around the amp. [. . . ]