(1) Multiple speakers can handle more power than a single speaker. Multi speaker cabinets are used for three basic reasons: This is applicable whether the speakers are in series, parallel, parallel/series or series/parallel as shown in figures 2, 3, 4 and 5. Therefore, with a multi-speaker cabinet all speakers must be properly phased or else some speakers will pull in while others are pushing out thereby decreasing the efficiency (and volume) of the speaker array. This phenomena shows that speakers do have polarity despite the fact that they operate with an AC signal. When an audio signal is applied to the voice coil, air is modulated according to the shape of this electrical signal and sound is produced. The speaker creates acoustic energy by acting like an air pump which pushes air out when the magnetic field created by the voice coil repels that of the permanent magnet and sucks air in when he magnetic field created by the voice coil attracts that of the permanent magnet. The cone is attached to the top opening with a circular flex edge (the surround) and at the base of the speaker with a smaller circular edge (the spider) shown in Fig. The speaker consists of two main parts (a) a movable cone (which travels in one dimension only - in and out) with a voice coil at the base of the cone and (b) a stationary magnet attached to the speaker frame. The speaker is a simple device which converts electrical energy into acoustic energy. The output of your amplifier typically will feed a speaker cabinet with anywhere from 1 to 8 speakers depending on the power level involved. So, now we explore how these speaker cabinet wiring schemes are handled. However, the additional speakers that you use will generate a much greater ability to produce volume due to additional cone area pushing the airwaves. So, think of doubling your amplifier power more as a dynamic headroom reserve rather than as a means to play louder. When adding additional speakers cabinets to unleash your amplifier's additional power reserve, remember, you must DOUBLE your amplifier's power to gain only a 3db increase in volume (a very small increment). You will first need to know the Minimum "load" requirements of your amplifier and how much power the amplifier produces at 8-Ohms, 4-Ohms and (in some, but not all cases) 2-Ohms. Most players want to get the maximum amount of available power out of their amplifier while allowing the flexibility of adding additional speakers when the need arises. A wire then goes from the tab to the positive terminal on each speaker.We get many questions about speaker loads and impedance when it comes to matching a Bass Amplifier with a Speaker cabinet. The +positive+ terminal goes from the amp to an eyelet on the “center tab” located on the baffle in the center of the four speakers. This is the standard wiring for vintage Fenders from the late 50’s to late 60’s, including the Super Reverb, Tweed Bassman, and Blackface Concert.Most Super Reverb amps from the late 60’son have this speaker wiring.Ĥ Speaker Wiring “CENTER TAB” SPEAKER WIRING FOR FOUR SPEAKERS Wired in parallel, you get the correct 2 ohm load for the above stated amps. In stock Fender amps, each speaker is 8 ohms. This is the standard wiring for Fender amps with four speakers, ie the Super Reverb, Tweed Bassman, and Blackface Concert.This is the correct wiring for the Twin Reverb, Vibrolux Reverb & Pro Reverb combos, and two speaker cabinets for the Bassman, Bandmaster, Dual Showman & Tremolux heads. Wired in parallel, you get the correct 4 ohm load. This is the standard wiring for Fender amps with two speakers.YOU CAN DOWNLOAD EACH OF THESE DIAGRAMS AS NECESSARY. HERE ARE 3 STANDARD WIRING DIAGRAMS THAT YOU CAN USE TO WIRE UP THE SPEAKERS IN YOUR FENDER. AB165 to AA864 'plus' tweed preamp for BLACKFACE AB165."1/2 Blackface" Mod for Ultralinear Fenders.
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