User manual ROCKFORD FOSGATE PUNCH4020 DSM

[. . . ] PuNcH 4O2O DSM 4-CHANNEL AnnPLTFTER I NsrnLLATroN Rockford Fosgate Rockford Corporation 546 South Rockford Drive Tempe, Arizona 85281 U. S. A. ln U. S. A. , (602\ 967 -3565 ln Canada, call Korbon (9OS) 567-1929 ln Europe, Fax (49) 4207-BO125O ln japan, Fax (Bl) 559-79-1265 10/94 MAN-OBOB. A & OpERATToN O\ocldbdlbsqdn Dear Custorner, Congrotulcrtiotts on your purchose amplifiers. At Rockf'ord Fosgate we are committed to musical reprotluctiott at its best, ancl we ore pleased you cltosc our product. 'I'hrou1;h yettrs <tf enginaerirry expertise, hctnd croftsrtrartship trnd critical tcstirrg proccdures, v)e have crectted a wide range of products thot rcprodttca tnusit-tvitlr oll tltc clorily otttl ricltttcss you deserue. b-rtr nnxintwtt pcrfortnottcc we rcconnn(nd yott lttt, t' your n(, tv llocklitttl l:os, gtttL' product installad by nn Authorizad llockfort! [. . . ] Take care when running signal level RCA cables to keep them close together but isolated from the amplifier's power cables and any high power auto accessories, especially electric motors. This is done to prevent coupling the noise from radiated electrical fields into the audio signal. When feeding the wires through the firewall or any metal barrier, protect them with plastic or rubrber grommets to prevent short circuits. Leave the wires long at this point to adjust for a precise fit at a later time. Engine Compartment Mounting Rockford Fosgate amplifiers should neverbe mounted in the engine compartment. Not only will this void your warranty but could create an embarrassing situation caused by the ridicule from your friends. 2. Prepare the Power cable for attachment to the amplifier by stripping 5/8" of insulation {rom the end of the wire. The use of B gauge power cable can interfere with the installation of the end caps. Proper wire dress can prevent this from occurring. To prevent the wire from fraying, strip the insulation at a 45" angle. lnsert the bared wire into the B+ terminal with the long side of the insulation on the top. Tighten the set screw to secure the cable in place. NOTE: The B+ cable MUST be fused 1B" or less from the vehicle's battery. lnstall the fuseholder under the hood and prepare the cable ends as stated above. Connections should be water tight. -9 - -10- )). Prepare a length of cableto be used fortheground connection. Strip 5/8" of insulation from the end of the cable as described UsrNc rHE XCano The crossover functions are controlled through the use of an XCard and can be set for high-pass, low-pass or full range operation. These cards are shipped in the most common frequency. Each crossover card has two faces: one face operates Full Range, the other has arrows to indicate the edge for selecting HP (high-pass) or LP (low-pass) operation. Orient the card with the desired operating edge, indicated by the arrow, toward the socket terminals inside the amplifier. Firmly, but carefully, plug the card into the socket. High above and connect to the appropriate terminal of the ampliier. Prepare the chassis ground by scraping any paint from the metal surface and thoroughly clean the area of all dirt and grease. Strip the other end of the wire and attach a ring connector. Fasten the cable to the chassis using a screw. f 4. [. . . ] 20 miltiseconcJs) anct rectucccl 20clB i. rthc an'rplifier's u'til unJr. , rn" signal is Sradually increasecl irr levcl 1'1, iotal Harmonic Distortion (l UD)' At 1"/n distorou, pr, "*. "". 1, auclible, therefore, any power llrrldr-rcecl above that , ion tr". orn"s i"u"l i, consiclered no, t usable. Many t'tralttr-tiactr-lrers represent their They use many amplifiers' outpLlt power in excess of 10'l' clistortiorr' such as Tcltal Maximum Power or nun. 't*, for this measurement, 30' 60' 84W 84W 83W 84W 85W 159 154 153 154 158 266 251 245 W W W W W W W W W (lnd) +60 +o* eo 30 0 30 60 zr1. co 30 0 ll0 21tj w t!f {, 0 (n) 2{il () 0 :10 MaximumoutputPower. Thisisnotinclicativeoftheactualusable out?ut Power. Listening to Loudspeakers - Not Resistors (resistance measured A loudsp"eaker is nOt a resistor. A resistor's value lJ13 W W ]li, tn) lt. is in thttl is fixecl' A loudspeaker's irrrpedance is dynanric' clependent r-rpon the frequency of the constantly changing in valuä, loaded iörilig, i"i. [. . . ]