Input Ground, Normal/Bridging Switch | Ashly FTX-1501, FTX-2001

Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier

Input Ground

The CHASSIS GROUND terminal is internally connected to the chassis, the AC earth ground, and the power amplifier’s signal ground. The INPUT GROUND terminal is tied to the XLR pin 1 and the 1/4" jack sleeve. It is recommended that the input and chassis ground ter- minals remain connected with the factory-supplied jumper strap.

In situations where the power amp and its signal source are separated by great distances, a ground voltage difference may exist between the amp’s chassis ground and the input cable’s ground. Connection of these two grounds through the jumper strap may cause large ground currents to flow (which is known as a ground loop), caus- ing a hum noise in the amp’s output. Unless you have such a situation with a hum problem that cannot be solved by using balanced input connections, the ground jumper strap should remain in place.

7.2Normal/Bridging Switch

This switch selects between NORMAL mode in the “out” position where both channels are in-phase, and BRIDGING mode in the “in” position where channel 1 input is used to drive both channels, inverting the phase of channel 2. In BRIDGING mode, the channel 1 red binding post is the (+) in- phase speaker output terminal and the channel 2 red binding post becomes the (-) out- of-phase speaker terminal. It is not necessary to depress the MONO switch in order to operate in BRIDGED mode. The BRIDGING switch overrides either setting of the Stereo/Mono Switch.

7.3Stereo/Parallel Mono Switch

This switch selects between STEREO mode in the “out” position and PARALLEL MONO mode in the “in” position. In PARALLEL MONO mode, channel 1 and channel 2 inputs are internally tied together before the input attenuator, allowing discrete channel control of a mono signal. CAUTION: Be sure not to have two sig- nal sources connected to ch.1 and ch.2 inputs when in parallel mono mode, as it would short-circuit these two signals and result in no output.

7.4Level Controls

The level controls allow attenuation (calibrated in dB) of the input signal. In PARALLEL MONO mode, channel 1 and channel 2 inputs are tied together, while still preserving independent level control per channel. In BRIDGED mode, use only channel 1 level control. It is recommended that the level controls be operated at full level (0 dB attenuation) in most situations to maximize the headroom in the signal source.

7.5Speaker Outputs - Binding Posts

A pair of dual banana binding posts provide the stereo speaker outputs. In BRIDGING mode, the channel

1red binding post is the (+) in-phase speaker output ter- minal and the channel 2 red binding post becomes the (-) out-of-phase speaker terminal.

CAUTION! NEVER CONNECT THE TWO RED BINDING POSTS TOGETHER OR CONNECT EITHER RED BINDING POST TO A BLACK BINDING POST!

FTX-1001, CFT-1800, FTX-2001, FTX-1501 specifications

The Ashly FTX-1501 is a high-performance, flexible amplifier designed for professional audio applications. Renowned for its efficient power management and robust construction, the FTX-1501 is an excellent choice for both live sound reinforcement and installed sound systems.

One of the key features of the FTX-1501 is its power output. The amplifier delivers a powerful 1500 watts per channel at 4 ohms, making it capable of driving large speaker systems without compromising sound quality. This substantial power output is essential for demanding environments, where clarity and volume are critical.

In terms of technologies, the FTX-1501 incorporates advanced Class D amplification technology. This not only provides remarkable efficiency, reducing heat generation and power consumption, but also ensures a lightweight design. The amplifier's compact form factor makes it easy to transport and install, which is particularly advantageous for mobile sound engineers and touring musicians.

The FTX-1501 also features intelligent thermal management, which protects the amplifier from overheating during extended use. Integrated cooling fans adjust their speed in response to the internal temperature, ensuring optimal performance without excessive noise. This feature is critical in ensuring that the amplifier maintains its performance under various loading conditions.

Connectivity options on the FTX-1501 are versatile, catering to various audio input needs. It includes XLR and TRS inputs, alongside binding post and Speakon outputs, providing flexibility for different setups. This connectivity facilitates easy integration into existing audio systems, further enhancing its usability.

Another important aspect of the FTX-1501 is its robust build quality. The amplifier is housed in a rugged steel chassis, designed to withstand the demands of both touring and fixed installations. The front panel features a user-friendly interface with LED indicators for power and signal status, making monitoring straightforward during live events.

Finally, the Ashly FTX-1501 embodies a commitment to audio fidelity. Its design minimizes distortion and enhances signal integrity, allowing users to enjoy clear, dynamic sound reproduction even at high volume levels. Whether for small venues or large events, the Ashly FTX-1501 amplifier is engineered to deliver exceptional performance, reliability, and versatility, making it a trusted choice for audio professionals worldwide.