JBL GHE 1200V Owners Manual English - Page 4
Bi-wiring
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B) 160 watts RMS into 4 ohms, both channels driven, 20-20kHz with less than 0.02% THD. 2. The nominal impedance of the second set of speakers. A pair of GHE Series speakers when combined with another pair of 8 ohm speakers will present an impedance to the receiver/amplifier that is approximately 4 ohms. This speaker combination can be used with the receiver/ amplifier cited in B above. If the receiver/ amplifier has a specification similar to that shown in A above, or if your second set of speakers has an impedance other than 8 ohms, you must consult the receiver/ amplifier manufacturer for clarification. Amplifier Flexibility Bi-wiring also allows you the option of using separate stereo power amplifiers for your left and right speakers. Using two stereo amplifiers (Fig. 5) can not only add sonic improvements but upgrade convenience as well. From a sound standpoint, dual amplifiers reduce intermodulation between left and right channels, since a complete set of input and power supply circuits are devoted to each speaker. Dual amps also provide an easy power upgrade path: you can start out with one stereo amplifier then add a second one later to quadruple power reserves. BI-WIRING Caution: Before attempting a Bi-Wire hook-up, take a few minutes to read through this section and follow the instructions carefully. The GHE Series speaker terminals are designed so that separate sets of speaker cable can be attached to the woofer (LF) and midrange/ treble (HF) portions of the crossover network. This configuration is called bi-wiring. Bi-wiring can provide several sonic advantages and considerably more flexibility in power amplifier selection. PREAMP HF HF LF LF STEREO AMP Fig. 4 - One Amp Bi-Wire. PREAMP w/Y-corded output Reduction of Intermodulation The majority of current flowing between an amplifier and speaker is devoted to the reproduction of bass. In fact, 60% or more of an amp's power is destined for the woofers. When current flows through a wire, it produces a magnetic field (EMF) which expands and collapses at a rate equal to that of the music's complex frequency components. If a single speaker wire must conduct the full musical frequency spectrum, this preponderance of low frequency information can interact with or modulate high frequencies. The resulting intermodulation can create audible changes to treble even before it reaches your loudspeakers. By using separate conductors for high and low frequencies (Fig. 4 & Fig. 6), unwanted treble modulation is avoided. Bass flows through one, treble through another. 4 HF HF LF LF STEREO AMPS Fig. 5 - Two Amp Bi-Wire.