User manual JENSEN MR-680 DATASHEET

[. . . ] If your Jensen amplifier should ever require service, you will need the original dated receipt. If you must return the unit for any reason, always include the receipt with the product. Your new Jensen Power mobile stereo power amplifier is the amplifier of choice for the high demands of auto sound reproduction. With its deep-bass reproduction and plenty of reserve power, low harmonic distortion and neutral reproduction, the Power series of amplifiers takes Mobile Hi-Fi to new heights. [. . . ] It is best to make sure you have everything you need before you start. Proper wiring connections are illustrated on the following pages. If wiring connections are made incorrectly, the unit will not operate properly and could become permanently damaged. Follow the installation instructions carefully, or have the amplifier installed by an experienced technician. Cordless drill with assortment of bits Flat-head and Philips screwdrivers Wire cutters/strippers Crimping tool 12-volt test light or digital multimeter Wire brush, sandpaper or scraping tool (ground connection to vehicle should be a clean, unpainted metal surface) Check the battery ground (there should be two (2) ground wires coming from the battery ­ one going to the starter mounting bolt or engine block and another 3 In some cases, the installation of just one (1) amplifier could be enough to overload your factory electrical system (i. Depending on the state of your electrical system and overall condition of your vehicle, you may need to upgrade your alternator and battery. After the vehicle is started, the alternator provides the power to your electrical system, not the battery. When the engine is running, the alternator is your main source of power. Upgrading the alternator should be your first consideration if you should experience a voltage drop in the system when operating your audio system. Adding capacitors and/or batteries without upgrading the alternator will only make the problem worse because these devices put an extra load on the alternator. After upgrading the alternator, capacitors and/or batteries can be installed if desired. On the amplifier, slowly turn up the input level control (clockwise or to the right) until you just start to hear distortion, then back it down a bit. Now your radio and amplifier levels are matched. Use STEREO mode when you have a 2-channel input from the source unit. Use MONO mode when you have a single input from the source unit. Adjusting the Bass Boost level allows different subwoofer/enclosure combinations to be equalized. Use this control to increase the level of low bass available from your subwoofer/enclosure combination. Ported and Band Pass enclosures should be limited to about +6dB to +9dB of boost. Sealed enclosures should be able to accept the full +12dB of boost, if necessary. The full +12dB of boost should be reserved for special applications since improper use of the Bass Boost could damage your subwoofers at high volumes. The 760 and 920 come equiped with a 2/3/4 MODE switch and can be configured for three different input modes: 2 channel, 3 channel or 4 channel. Bandpass boxes will typically use a higher crossover setting between 125Hz and 150Hz. [. . . ] Problem Amplifier does not turn on Possible Cause No power to +12V terminal No power to REM terminal Blown main fuse at battery Blown fuse at amplifier Faulty ground Corrective Action Check fuse(s) Check head unit fuse(s) and wiring Replace fuse and identify cause of failure Replace fuse and identify cause of failure Re-ground main power ground to bare metal chassis Re-adjust the input level (refer to page 8) Re-adjust the input level (refer to page 8) Reconnect power wires properly Take unit for service Use good quality shielded RCA cables Re-ground amp to clean bare metal chassis Re-ground head unit to clean bare metal chassis Re-route RCA and/or speaker wires away from factory harnesses Re-adjust input level (refer to page 8) If the amplifier "thermals" frequently while driving subwoofers, install fan to keep amp cool. Input level control adjusted too high Input level control adjusted too high Blows fuse(s) at amp Power wires connected backwards Internal problem with amp Engine noise / Ground loop(s) Alternator whine Faulty ground at amp Faulty ground at head unit Inductive coupling Volume control too sensitive Distorted sound Blown speakers Speaker wire(s) shorting to ground Defective crossover Amp connected to improper load Amp will not drive a 1 ohm mono load, 2 ohm minimum in mono configuration Speakers defective/ blown Faulty passive crossovers Speakers out of phase Check speakers Check crossovers Check speaker polarity; reverse the connection to one speaker only if two subwoofers are connected to the amplifier. NOTE: If the protection light is activated with no speakers connected to the amplifier, and all the power connections are correct, this would indicate an internal problem with the amplifier. Input level on amp set too high Amplifier driving 2 ohm load for long durations Power Output: 90 watts RMS X 4 channels into 4-ohms @ < 1% THD+N Signal to Noise Ratio: 100dBA below reference (Reference: 1 watt, 4-ohms) Additional Power Output: 120 watts RMS X 4 channels into 2-ohms @ < 1% THD+N 190 watts RMS X 2 channels (Bridged Stereo) into 4-ohms @ < 1% THD+N Frequency Response: 10Hz to 60 kHz, -3dB (Reference: 1 watt) Dimensions: L15. [. . . ]