User manual DLS MRA41

[. . . ] Contents How to install and operate the DLS Marine Audio amplifiers MRA22 MRA31 MRA41 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 3 3 4 4 4 4 5 5 5 Welcome! This owners manual is written in easy english and uses a lot of drawings to simply the installation and use of the above amplifiers. Your DLS amplifiers must be installed correctly in order to work well. Install the amplifier yourself if you feel confident with our instructions and if you have the proper tools. [. . . ] MRA22 uses one 25 A fuse. Parallel input on MRA31, MRA41 Parallel Input MRA31 Off PC Parallel Input MRA41 Power Light / Protect light Power (Green) Protect (Red) Off PCD On MRA31 the PC position internally connects the A/B input with the input for channel C. On MRA41 the PCD position internally connects the A/B and C/D inputs. The power light (green ) comes on when the amplifier is turned on. The protect light ( red ) comes on when the amplifier shuts down from overheating, or a short circuit ( speaker failure) 4 MRA22, MRA31, MRA41 Input Level control The input level control, 5V ­ 0, 25 V, Level matches the output of your radio to the input of the amplifier. After installation is complete, make sure the input of the amplifier is turned down all 5V 0, 25V the way ( counter-clockwise at 5V ). Play a tape or CD, make sure all bass or treble settings or equalizer are flat, and turn the volume of the radio up until you just start to hear distortion. This function is used to compensate for the bass box function and to adjust for your own taste of bass. Set level control at 0 dB if you want it to be inoperative. The HPF (high pass filter) blocks very low frequencies from reaching the speakers. It is mostly used at say 60 Hz to protect small speakers (like 6 inch and smaller) from deep bass. It can also be used as subsonic filter to take away the very deepest frequencies from a bass box. The filter can be switched off if you want to run the amplifier in full range mode. On MRA41 the filter can also be used for active crossover in a 2-way speaker component kit, a typical crocssover point is then 3, 5 - 4 kHz. It has also a variable low pass filter, (LPF) 50-500 Hz for subwoofer use. HPF 50Hz 220Hz LPF 80Hz 200Hz 15Hz 500Hz 50Hz 500Hz Off On Off On The MRA41 is a four channel amplifier. It is mostly used with a front system connected to channels C/ D and a subwoofer connected to channel A/B. Please observe the proper settings of the channel A/B LPF multiplier switch and of the channel C/D HPF multiplier switch. The MRA41 can also be used to feed a 2­way front system with active crossovers between midbasses and tweeters. This is described in a speaker wiring and filter setting example on page 10. LPF Multiply 80/800Hz 200/2(k)Hz Off On50/500Hz 500/5(k)Hz x1 x10 HPF Multiply 50/500Hz 220/2(k)Hz The MRA31 is a three channel amplifier. The C channel is for subwoofers and has a subsonic filter, a variable low pass filter, 50-120 Hz, and a phase control variable from 0 - 180 degrees. The subsonic filter can be switched IN-OUT and has a fixed frequency of 25 Hz. Off On 15/150Hz 500/5(k)Hz x1 x10 Channel A/B is equipped very much like the MRA22, however the LPF has a multiplier. Thus the frequency range of the LPF can be varied from 50 Hz ­ 500 Hz in the x1 position or 500 Hz ­ 5 kHz in the x10 position. This way we can use this amplifier to feed a 2way system, where the midbasses are fed from 80 Hz ­ 4 kHz. The tweeters connected to channel C/D , operate from 4 kHz upwards using the HPF in multiplier position x 10 150 Hz ­ 5 kHz. 6 MRA22 Speaker wiring MRA 22 Two fullrange speakers to MRA22 One subwoofer connected in bridge mode to MRA22 NOTE!Filter settings HPF 50Hz 220Hz 15Hz 500Hz 15Hz 500Hz Filter settings HPF 50Hz 220Hz Off On Off On With the HPF-filter in OFF position the amplifier allows the speakers to play fullrange. [. . . ] Change left and right signal lead plugs in the amplifier to see if the problem moves to a different speaker, the lead has a fault. If the problem remains, the speaker or amplifier are at fault. Reconnect Battery When wiring is complete, reconnect the battery negative terminal. Test power wiring 1. if not, check wiring connections at amplifier and speakers. 2. Test speaker connections Make sure the speakers are connected correct. Use the balance control on the head unit to make sure right channel is on right speaker etc. [. . . ]