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Alpine SPX-Z18T [12/48] Jumper group function
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10
Jumper Group Function
Although recommendations are made for the most common system types in the following
pages, there are actually over 1000 unique and useful jumper combinations available for a
wide variety of vehicles, installations and personal tastes. While this flexibility has obvious
advantages, too many choices can also be confusing. Therefore, it will be helpful to under-
stand the function of each jumper group in order to tune the network more effectively:
TW-HP:
In addition to functioning as a high-pass filter, this section also provides the necessary
adjustments for proper integration with the midrange. The transition between these two
drivers in the frequency and time domains is essential to the total performance of a
multi-element system, as it has a direct effect upon imaging, staging, focus
and tonal balance. In real world installations, distance and angle of both drivers relative
to the listener, their proximity to each other, and certainly the vehicle's interior also exert
additional influence. In anticipation of this, variations of filter slope, Q, cut-off frequency
and resultant phase shift are provided so that "phase linkage" and flat summation can
be maintained. As a general reference, the layout and available filter types of the tweeter
high-pass section are provided below:
TW LEVEL:
In general, this section provides precise level adjustment for optimum performance or
personal taste. 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 lis-
tening 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 func-
tion, but basic level adjustment will still be possible.
R1 = 1.5Ω
R2 = 3.3Ω
R3 = 4.7Ω
R4 = 5.6Ω
R5 = 0.5Ω
C1 = 3.3µF
C2 = 8.2µF
L1 = 0.65mH
L2 = 0.1mH
HP-1
HP-2
BYPASS
+1.5dB/15°
0dB/0°
–1.5dB
–3dB
L1 L2
R4
R1
R2
R3
C1
C2
R5
+4dB/30°
HP-3
+
+
–
–
1
st
Order:
• No HP jumpers
• HP3
2
nd
Order:
• HP1 + HP2 + HP3
• HP1 + HP3
• HP2 + HP3
3
rd
Order:
• HP1
• HP2
• HP1 + HP2
Содержание
- Attention 3
- Avertissement 3
- Caution 3
- English français 3
- Points to observe for safe usage 3
- Warning 3
- English français 5
- Midrange haut parleur médial 5
- Parts list liste des pièces 5
- Tweeter tweeter 5
- Way network circuit répartiteur à 3 voies 5
- Woofer woofer 5
- Woofer installation installation du woofer 6
- English français 7
- Installation with a grille installation avec grille 7
- Installation without a grille installation sans grille 7
- Midrange installation installation du haut parleur médial 7
- Speaker wire connections raccordement des fils d enceinte 7
- Installation with a mounting cup installation from the front 8
- Installation with springs installation avec ressorts 8
- Tweeter installation installation du tweeter 8
- English français 9
- Caution 10
- Connect properly by following the manual otherwise it might result in fire or accident 10
- Connection example 1 exemple de connexion 1 10
- Connection example 2 exemple de connexion 2 10
- Connection example 3 exemple de connexion 3 10
- Mid tw signal link 10
- Network connections connexions du circuit 10
- Reliez correctement en suivant le manuel autrement il pourrait avoir comme conséquence le feu ou des accidents précaution 10
- Wf mid signal link 10
- When connecting to bi amp bi wiring lors du raccordement avec deux amplificateurs câblage double 10
- When connecting to single amp single wiring lors du raccordement avec un seul amplificateur câblage simple 10
- When connecting to tri amp tri wiring lors du raccordement avec trois amplificateurs câblage triple 10
- Crossover network introduction 11
- English 11
- Jumper group function 12
- English 13
- Jumper group function 14
- English 15
- Is for such cases where pathlength is nearly the same to all drivers but where the mount ing surface orientation creates a uniform but fairly extreme off axis listening angle 15
- System description 15
- System type 1 15
- 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 al though such an installation may not often be practical in situations other than the demo board 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 if choosing to go beyond the recommended settings or utilizing the network in a partially active mode keep in mind that phase coherence and flat summa tion remains critical even in the idyllic flat baffle situation as each driver type exhibits unique phase and group delay characteristics 15
- System type 1 16
- English 17
- System type 2 18
- English 19
- Network jumper setting 20
- Notes highlighted tweeter level jumpers are the recommended settings for each configura tion but user adjustment may be desirable transfer function simulations only illustrate the effect of the filter upon the input sig nal 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 appro priate signal link jumpers must be removed 20
- System type 2 20
- Type 2b tweeter and midrange positioning are the same as in type 2a but the woofer is located farther forward this results in a more extreme woofer listening angle of ap proximately 70 with a delay of 28cm rela tive to the mid subsequently level attenua tion is applied to both the tweeter and mid while also adjusting filter characteristics appropriatly for the mid woofer transition in this case changing the midrange high pass to a low q 3rd order and the woofer low pass to very high q 2nd order results in an acoustic crossover point of 500hz 20
- Although the midrange and tweeter are mounted close together in this case space limitations aesthetics or practicality requires that the woofer be mounted separately utilizing the kick panel and door locations is the most common method though it is certainly not the only one what is most significant is that by mounting the midrange and tweeter in close proximity with a minimized off axis angle at the greatest distance possible it provides one of the best arrangements for optimum imaging in the vehicle since there are varying degrees of axis and pathlength that will be achievable in some installations two basic configurations are provided to accommodate the most common cases keep in mind that the network tuning described below considers the best bal ance between driver and passenger listening positions so all distances and angles are referenced to the nearest side 21
- English 21
- System description 21
- System type 3 21
- System type 3 22
- English 23
- System type 4 24
- English 25
- If separate channels of amplification are used bi wire or tri wire mode the appro priate signal link jumpers must be removed 25
- Network jumper setting 25
- The 4db 30 setting in the tw level jumper group bypasses all resistors in the tweeter section 25
- Français 27
- Introduction au circuit répartiteur 27
- Fonction de groupe cavalier 28
- Français 29
- Fonction de groupe cavalier 30
- Description du système 31
- Français 31
- Lorsque les trois amplificateurs sont montés proches les uns des autres et à égale distance de la position d écoute il s agit certainement de la configuration la plus favora ble pour un système bien que ce type d installation ne soit pas souvent pratique si ce n est sur le panneau de démonstration elle est certainement possible étant donné les techniques de fabrication personnalisées disponibles de nos jours pour anticiper cela un degré de tolérance est intégré aux réglages décrits ci dessous pour les cas les plus probables bien qu une expérimentation puisse être nécessaire si toutes les conditions ne peuvent pas être respectées si l on choisit d aller au delà des paramètres recom mandés ou d utiliser le circuit dans un mode partiellement actif il faut garder à l esprit le fait que la cohérence de phase et la transparence de combinaison demeurent les élé ments les plus importants même dans le cas d enceinte transparente car chaque type d amplificateur offre des caractéristiques de phas 31
- Type de système 1 31
- Type de système 1 32
- Français 33
- Description du système 34
- Type de système 2 34
- Français 35
- Type de système 2 36
- Bien que le haut parleur médial et le tweeter soient montés proches l un de l autre dans ce cas les contraintes d espace l esthétique et l aspect pratique requièrent que le woofer soit monté séparément le panneau d auvent et les portes sont les endroits de mon tage les plus courants mais ce ne sont certainement pas les seules ce qui est le plus significatif est que en montant le haut parleur médial et le tweeter à proximité l un de l autre avec un angle d écartement de l axe de la position d écoute minimisé on obtient l installation la meilleure pour obtenir un réglage d image optimal à l intérieur du véhi cule puisque qu il existe différents degrés d axe et de longueur de chemin qui pourront être obtenus dans certaines installations deux configurations de base sont fournies pour satisfaire les cas les plus communs gardez bien à l esprit le fait que la configura tion de circuit décrite ci dessous prend en compte le meilleur équilibre entre la position de l amplificateur et la position 37
- Description du système 37
- Français 37
- Type de système 3 37
- Remarques 38
- Réglage du cavalier du circuit 38
- Type 3a 38
- Type de système 3 38
- Français 39
- Remarques 39
- Réglage du cavalier du circuit 39
- Type 3b 39
- Type de système 4 40
- Français 41
- Le réglage 4db 30 dans le groupe cavalier tw level court circuite tous les résistors dans la section du tweeter si l on utilise des canaux d amplification séparés mode deux ou trois fils les cavaliers de liaison de signal appropriés doivent être retirés 41
- Remarques 41
- Réglage du cavalier du circuit 41
- External dimensions dimensions externes 42
- English français 43
- Français 43
- Specifications spécifications 44
- System 44
- Type component 44
- Way speaker power handling peak rms 200 50w impedance 4 ω frequency response 35 60 khz net weight 11 kg 44
- Alpine electronics marketing inc 48
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