User manual ALPINE SPX-Z18M

[. . . ] Read this manual carefully before starting operation and use this system safely. We cannot be responsible for problems resulting from failure to observe the instructions in this manual. This manual uses various pictorial displays to show how to use this product safely and to avoid harm to yourself and others and damage to your property. Here is what these pictorial displays mean. [. . . ] However, it also allows for "tilting" of the filter frequency response in order to compensate for the natural high frequency roll-off associated with off-axis listening angles. In other words, this jumper choice will have a direct effect on both Q and cut-off frequency of the various filter combinations listed above. This effect can be seen in the filter transfer function graphs for the various system types. If the TW-HP section is set to bypass in favor of an electronic crossover, the off-axis feature will no longer function, but basic level adjustment will still be possible. MID HP/LP: As a selectable bandpass filter for the midrange, the net effect of this section is naturally linked to the selections made in the tweeter high-pass and woofer low-pass sections. Achieving the most phase coherent and flat summation possible requires controlling the amount of inherent phase shift of each filter, and is directly related to the selection of filter order, Q and cut-off frequency. Again, this relationship is also affected by the distance and angle of each driver relative to the listener and their proximity to each other. Since the acoustic center of the midrange will be farther back than the tweeter in nearly all applications, minimal delay is desirable in the midrange low-pass. Subsequently, this filter is of low order, and leaves much of the adjustment capability for the mid/tweeter transition to the tweeter high-pass section. For the midrange high-pass, higher order configurations are used in most applications to achieve phase linkage with the woofer (see WF-LP section). for general reference , the available midrange network configurations are listed below. In certain installations where positioning or placement necessitates level adjustment, a jumper is provided that boosts midrange output by approximately +2dB. As an additional note, either filter (high-pass or low-pass) may be bypassed independently for semi-active applications. Since it is often difficult to position the woofer and midrange close together or at equal distances, it is critical to achieve phase linkage between them to avoid localization, image smear, poor staging, etc. Additionally, vehicle interior dimensions are typically close to the wavelength of the woofer/midrange crossover region, so it may be necessary to minimize overlap to reduce the chance of generating a complex canceling sound field or response aberrations. Therefore, a variety of higher order filter types and characteristics are provided in this section, making it possible to link the two drivers in relative phase for a smooth transition in many applications. Again, it is important to note that the selections made in both the WF-LP and MID-HP sections produce a net effect, and must be set in such a way so as to work together. SIGNAL LINK: The signal link jumpers provide a parallel connection between the input sides of the terminal blocks, eliminating the need for extra terminals or wiring when using a single or dual input. Caution: These jumpers must be removed accordingly when used in a bi-amp or tri-amp configuration to prevent possible damage to amplifiers. System Description With all three drivers mounted close together and equidistant to the listening position, this is surely the most favorable configuration for a component speaker system. Although such an installation may not often be practical in situations other than the demoboard, it is certainly possible given the custom fabrication techniques available today. In anticipation this, a degree of tolerance is built into the settings described below for the most likely cases, though some experimentation may be necessary if all conditions cannot be met. [. . . ] Since the tweeter and midrange are farther away, minimal delay and some level adjustment are desirable, utilizing a low Q semi-2nd order high-pass on the tweeter and a 1st order low-pass on the mid for a resultant acoustic crossover point of 3. Highlighted tweeter level jumpers are the recommended settings for each configuration, but user adjustment may be desirable. Transfer function simulations only illustrate the effect of the filter upon the input signal, and therefore do not represent the actual frequency response of the system. If separate channels of amplification are used (bi-wire or tri-wire mode), the appropriate signal link jumpers must be removed. [. . . ]