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Device for attenuating guitar amp output. Use only as described; improper use may cause injury or damage.
Ensure proper disposal of packaging. Prevent children from detaching parts to avoid choking hazards.
Device contains high voltages. Never remove covers. Do not use if covers/protectors are missing or damaged.
The Harley Benton PA-100 Power Attenuator is a versatile device designed to manage the output level of guitar amplifiers, particularly tube amplifiers. It serves as a power soak, making it an ideal tool for various musical environments, including rehearsal rooms, recording studios, and live stages. The primary function of the PA-100 is to allow guitarists to drive their tube amplifiers to their sweet spot – where the tubes are fully saturated and producing their characteristic warm, rich tone – without having to contend with excessively high volume levels. This is crucial for achieving optimal tone at manageable volumes, preventing hearing damage, and maintaining good relationships with neighbors or sound engineers.
The attenuator works by absorbing a portion of the amplifier's output power and converting it into heat, thereby reducing the signal sent to the speaker. This allows the amplifier to operate at its full potential, generating desirable tube breakup and harmonic richness, while the actual sound pressure level from the speaker is significantly lowered. The PA-100 is designed to handle a maximum input power of 100 W, making it suitable for a wide range of common guitar amplifiers.
One of the key usage features of the PA-100 is its flexibility in connecting to different amplifier output impedances. It provides inputs for 4 Ω, 8 Ω, and 16 Ω, ensuring compatibility with most guitar amplifiers. Users must always select the input that matches the output impedance of their connected amplifier to prevent damage to the amplifier. A crucial safety note emphasizes that connections should always be made or changed when the amplifier is disconnected or turned off to avoid potential damage to the amplifier.
The device offers multiple output options, enhancing its utility. It includes a low-impedance XLR output labeled [MicMod], which is designed for connecting to a mixing console or a recording device. This output often incorporates a speaker simulation, allowing users to capture a "miked cabinet" sound directly without needing an actual microphone or speaker cabinet. This feature is particularly valuable in studio settings or for silent practice/recording. Additionally, there is a line output, [Out Line], which can be used to connect to effects processors or a separate power amplifier. This allows for further signal processing or re-amplification at a different stage. For direct speaker connection, the PA-100 provides an [Out Speaker] output socket for passive speaker boxes.
Control over the attenuation is provided by two rotary controls. The [SPK Level] control adjusts the signal attenuation at the speaker output. Turning this control counter-clockwise reduces the volume of the output signal. Even with the [SPK Level] control in its '9' position (maximum output), the signal is still attenuated by approximately 3 dB, indicating that some level reduction is always present. When the [SPK Level] control is in the '0' position (minimum output), a very low signal might still be audible through connected speakers, especially with high-output amplifiers. This suggests that while significant attenuation is possible, complete silence from the speaker output might not always be achieved, depending on the amplifier's power.
Another rotary control, [Line Level], is dedicated to adjusting the signal attenuation at the line out. This allows independent control over the level sent to external devices, separate from the speaker output. An LED labeled [Full Power] serves as an overload indicator, providing visual feedback if the input signal is too strong, helping users to prevent clipping or damage.
A notable feature of the PA-100 is its ability to function as a dummy load. This means it can safely absorb the full power of a tube amplifier without a speaker connected. This is an invaluable feature for tube amplifiers, as operating them without a load can cause severe damage. When using the PA-100 as a dummy load without a loudspeaker and utilizing one of the other two outputs (XLR or line), it is recommended to set the [SPK Level] control to a position between '2' and '3'.
The PA-100 also incorporates a silent fan for cooling, which is essential given that the device converts excess power into heat. This ensures stable operation and longevity of the unit, especially during prolonged use at high attenuation levels. The inclusion of a DI output with speaker simulation further enhances its versatility, offering a convenient solution for direct recording or sending a consistent, cabinet-emulated signal to a front-of-house mixer.
For maintenance, the PA-100 requires regular cleaning of its externally accessible parts. The frequency of cleaning depends on the operating environment; wet, smoky, or particularly dirty surroundings will necessitate more frequent cleaning. The device should be cleaned with a soft, dry cloth. For stubborn stains, a slightly damp cloth can be used. It is crucial to avoid cleaners containing alcohol or thinner, as these can damage the finish or components. The fan grids, being vital for cooling, must also be cleaned regularly to prevent dust and other contaminants from accumulating, which could lead to overheating and malfunction. Before cleaning the fan grids, the device should always be switched off, and any mains-operated devices disconnected from the mains. Only pH-neutral, solvent-free, and non-abrasive cleaning agents should be used, applied with a slightly damp, lint-free cloth.
Users are also advised to be mindful of the device's rubber feet. The plasticizer in the rubber may react with certain surface coatings over time, potentially causing permanent dark stains. To prevent this, it is recommended to use a suitable underlay, such as felt pads, if there is any doubt about the surface compatibility.
In summary, the Harley Benton PA-100 Power Attenuator is a robust and feature-rich device designed to optimize the performance of tube amplifiers by allowing them to be driven hard at reduced volumes. Its multiple input and output options, combined with speaker simulation and dummy load capabilities, make it a highly adaptable tool for guitarists in various professional and home settings. Proper connection procedures and regular, careful maintenance are key to ensuring its safe and long-lasting operation.
General| Type | Portable PA System |
|---|---|
| Power | 100 W |
| Speaker Configuration | 2-way |
| Channels | 3 |
| Bluetooth | Yes |
| Effects | Reverb |
| Woofer Size | 10 inches |
| Tweeter Size | 1 inch |
| Inputs | 2x XLR/Jack Combo, 1x Aux |
| Outputs | XLR |
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