The Yamaha S4115HII is a professional sound reinforcement speaker system featuring a front-loaded horn bass-reflex enclosure. It utilizes a 38 cm carbon cone woofer and a high-performance HF driver with a horn combination to deliver balanced audio reproduction across low and mid-to-high frequencies. The unit includes an input panel with an adjustable H.F. LEVEL control for optimizing performance in various operating conditions.
This manual provides instructions on connecting the speaker to mixers or power amplifiers, including parallel connection guidelines. It details installation procedures such as replacing phone jacks with XLR connectors and explains the function of the high-frequency level controller. The document also includes a comprehensive list of technical specifications, performance graphs, and service information.
| Frequency Range | 50Hz to 16kHz |
|---|---|
| Power Capacity (Program) | 240W |
| Power Capacity (Max.) | 480W |
| Nominal Impedance | 8 ohms |
| Sensitivity | 103dB SPL (With 1W at 1m on-axis) |
| Crossover Frequency | 1.6kHz |
| Enclosure Type | Front loaded-horn, Bass reflex type |
| Dimensions (W x H x B) | 632 x 827 x 457 mm |
| Weight (With caster) | 56.0kg (123.2 lbs) |
The nominal impedance of the S4115HII is 8 ohms.
No, you should never connect more than two speaker units in parallel unless using a power amplifier designed to operate with a load impedance lower than 4 ohms.
Turn the H.F. LEVEL knob left to reduce the level by 1.6 kHz or more, and turn it toward MAX to increase it by 1.6 kHz or more.