ST15 - Transformateur audio YAMAHA - Notice d'utilisation et mode d'emploi gratuit
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| Type de produit | Transformateur audio d'adaptation d'impédance |
| Marque | YAMAHA |
| Modèle | ST15 |
| Puissance nominale | 15 W continue |
| Réponse en fréquence | 50 Hz – 20 kHz |
| Distorsion harmonique totale | ≤ 1 % (1 kHz, 15 W) |
| Perte d'insertion | ≤ 1,5 dB |
| Tension de ligne | 100 V ou 70 V |
| Impédances secondaires | 8 Ω (bleu), 6 Ω (jaune), 4 Ω (orange), 2 Ω (marron) |
| Rapport de transformation | Primaire: secondaire variable selon couleur |
| Dimensions (L × H × P) | 80 × 48 × 46 mm |
| Poids | 450 g |
| Matériau du boîtier | Métal |
| Type de connexion | Fils dénudés (bornes à vis) |
| Installation | Fixation par vis sur enceinte ou surface |
| Utilisation prévue | Adaptation d'impédance pour liaison en parallèle de haut-parleurs basse impédance sur amplificateur haute impédance |
| Sécurité | Respecter les limites de puissance et d'impédance ; isoler les fils non utilisés |
| Entretien | Nettoyage à sec, éviter l'humidité |
| Réparabilité | Pièces non détaillées ; contacter un professionnel |
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MODE D'EMPLOI ST15 YAMAHA
Thank you for purchasing the Yamaha ST15 Speaker Transformer. This device is a matching transformer that is used for the parallel connection of low impedance speakers to a high impedance type distribution power amplifier.
Please read this manual carefully to get the most out of the ST15 and use in a safe manner.
Outline
This device has a capacity of 15W , the line output of the power amplifier connected to the primary pole is assumed to be 100V (using a 70V line is also possible).
The blue, yellow, orange and brown secondary cords each correspond to speakers whose nominal impedance is 8, 6, 4 and 2 while the input impedance of the connected power amplifier is 670 .
Connection
- Turn the power switch OFF on the power amplifier you are going to connect the ST15 to.
- Use two 4 mm (1/8") tapping screws, securely attach the unit to a speaker or some other convenient location.
- Connect the ST15's white primary cord to the power amplifier's 100 V or 70 V negative (-) pole, connect the black cord to the power amplifier's 100 V or 70 V positive (+) pole.
- Connect the white secondary cord to the speaker's negative (-) pole. From the blue (8) , yellow (6) , orange (4) and brown (2) cords, choose a cord that matches the speaker's impedance and connect the selected cord to speaker's positive (+) pole.
- Bundle together the unused secondary cords to prevent shot circuits, etc.
■ Advanced Applications
Connecting Speakers of Different Impedance
An 8 speaker can be connected to the lower impenitence yellow (6) , orange (4) cords however, low impedance speakers cannot be connected to higher impedance cords. The capacity will be exceeded creating a hazard.
When connecting speakers of different impedance, refer to the following chart. Please use caution when in such applications since speaker input dB and the input impedance will change.
100 V Line Connections
| 8Ω Speaker Input Impedance | 6Ω Speaker Input Impedance | 4Ω Speaker Input Impedance | ||||
| Blue | 15 W | 670Ω | × | × | ||
| Yellow | 11.3 W | 890Ω | 15 W | 670Ω | × | |
| Orange | 7.5 W | 1330Ω | 10 W | 1000Ω | 15 W | 670Ω |
| Brown | 3.8 W | 2670Ω | 5 W | 2000Ω | 7.5 W | 1330Ω |
- 70 V Line Connections
| 8Ω Speaker Input Impedance | 6Ω Speaker Input Impedance | 4Ω Speaker Input Impedance | ||||
| Blue | 7.5W | 670Ω | × | × | ||
| Yellow | 5.65W | 890Ω | 7.5W | 670Ω | × | |
| Orange | 3.75W | 1330Ω | 5W | 1000Ω | 7.5W | 670Ω |
| Brown | 1.9W | 2670Ω | 2.5W | 2000Ω | 3.75W | 1330Ω |
Limitations for Parallel Use
Depending upon the manner in which this device is used, the connection of multiple speakers is possible however; the number of speakers will be limited according to the power amplifier's specifications.
- The total input for the speakers that are being used should not exceed the power amplifier's maximum output.
When the line output transformer is used, its capacity should not be exceeded.
- The total input impedance for the speakers that are being used should not be less than the minimum load impedance of the power amplifier, including the line output transformer.
The ST15 can be used in this manner as long as both conditions 1 and 2 are met.
■ Specifications
| Capacity | 15 W Continuous | |
| Frequency Response | 50 Hz-20 kHz | |
| Total Harmonic Distortion | ≤ 1% (1 kHz, 15 W) | |
| Insertion Loss | ≤ 1.5 dB | |
| Dimensions (W × H × D) | 80 × 48 × 46 mm (3-1/8" × 1-7/8" × 1-13/16") | |
| Weight | 450 g (15.8 oz) | |
| Coil Ratio | Primary: Secondary | Secondary Voltage Ratio |
| *BLU | 1:0.110 | 0 dB |
| *YEL | 1:0.095 | -1.25 dB |
| *ORN | 1:0.077 | -3.0 dB |
| *BRW | 1:0.055 | -6.0 dB |
The contents of this manual apply to the latest specifications as of the printing date. Since Yamaha makes continuous improvements to the product, this manual may not apply to the specifications of your particular product. To obtain the latest manual, access the Yamaha website then download the manual file. Since specifications, equipment or separately sold accessories may not be the same in every locale, please check with your Yamaha dealer.
*Color Chart
BLU: Blue YEL: Yellow ORN: Orange
BRW: Brown WHT: White BLK: Black
■ Wiring Diagram


Dimensions
