Q: How to connect an external subwoofer to the RCF EVOX J11?

The RCF EVOX J11 is a three-way integrated audio system that does not support the connection of an external subwoofer. This speaker already features a powerful 12" woofer combined with 12 drivers of 3" for mids and highs, providing a complete reproduction of the audio spectrum. However, you have several solutions to enhance your system: Daisy-chaining other EVOX J11s : you can connect multiple speakers in cascade via the male XLR outputs located at the back of the unit. This solution allows for increased overall power and frequency coverage. Amplifying the audio input : the RCF EVOX J11 has a female combo XLR/Jack input (balanced) that accepts male XLR or Jack connectors. Ensure that your audio source provides an appropriate line-level signal. Cascading power supply : the PowerCON TRUE1 TOP outputs also allow for chaining the power supply if you add other units. If you absolutely need more bass, adding a second EVOX J11 remains the recommended solution rather than trying to connect an incompatible external subwoofer.

Question 1

Can the RCF 15-Ax subwoofer be connected to the RCF EVOX J11?

Accepted Answer

No, the RCF 15-Ax subwoofer is not compatible with the RCF EVOX J11. The EVOX J11 is a three-way integrated audio system that does not support the connection of an external subwoofer, of any kind.

The EVOX J11 is equipped with a powerful 12" built-in woofer and a 3500 W Class D amplifier designed to ensure complete audio spectrum reproduction up to 132 dB SPL on its own. Therefore, adding an external subwoofer is not possible on this model.

Recommended alternative

If you need greater power or sound coverage, the solution is to connect multiple EVOX J11 units in daisy-chain using the male XLR outputs available on the back panel. Each unit can thus be integrated into the system in cascade, multiplying the overall capacity while maintaining sound coherence.

Question 2

How to connect an external subwoofer to the RCF EVOX J11?

Accepted Answer

The RCF EVOX J11 is a three-way integrated audio system that does not support the connection of an external subwoofer. This speaker already features a powerful 12" woofer combined with 12 drivers of 3" for mids and highs, providing a complete reproduction of the audio spectrum.

However, you have several solutions to enhance your system:

Daisy-chaining other EVOX J11s: you can connect multiple speakers in cascade via the male XLR outputs located at the back of the unit. This solution allows for increased overall power and frequency coverage.
Amplifying the audio input: the RCF EVOX J11 has a female combo XLR/Jack input (balanced) that accepts male XLR or Jack connectors. Ensure that your audio source provides an appropriate line-level signal.
Cascading power supply: the PowerCON TRUE1 TOP outputs also allow for chaining the power supply if you add other units.

If you absolutely need more bass, adding a second EVOX J11 remains the recommended solution rather than trying to connect an incompatible external subwoofer.

Question 3

Can I place the RCF ART 745-A MK5 in a horizontal (flat) position to use it as a subwoofer?

Accepted Answer

The RCF ART 745-A MK5 is a complete active 2-way speaker, not a subwoofer. Its cabinet measuring 700 x 430 x 420 mm is designed to be used in a vertical position, resting on a standard 35 mm pole.

Although the 15" (380 mm) neodymium woofer and its frequency response of 45 Hz – 20 kHz provide good bass reproduction, the PDF of this manual does not specify whether the speaker can be placed in a horizontal (flat) position. Positioning a speaker of this size and weight (20.5 kg) other than vertically may compromise:

Its constant directivity (90° x 60°), optimized for vertical position
The stability of the cabinet and the mechanical stress on the internal components
The airflow for cooling the amplifiers (1400 W peak)

If you are looking for a solution to play bass in a lying/flat position, it is better to invest in a true subwoofer designed for this orientation. For horizontal use, we recommend contacting RCF support directly to get their opinion on mechanical and acoustic compatibility.

Question 4

Can I connect a subwoofer to the RCF ART 745-A MK5?

Accepted Answer

No, the RCF ART 745-A MK5 does not have a dedicated output to connect a subwoofer. This professional active speaker only offers combo XLR/jack audio inputs (CH1 and CH2) and an XLR Link output for chaining with other speakers.

If you need to enhance the low frequencies, you must opt for an alternative solution: either connect a passive subwoofer via an external amplifier powered by one of the CH1/CH2 inputs, or use a full-range speaker with a built-in subwoofer.

Question 5

Can the volume of the RCF EVOX J9 be turned all the way up while keeping the mixer at 0dB to avoid clipping?

Accepted Answer

No, this approach is not recommended. Here’s why:

The Problem

Turning the J9's potentiometer all the way up while keeping the mixer at 0dB is likely to cause the signal to clip at the speaker's input. The maximum volume of the J9 will already amplify a strong signal coming from the mixer.

The Best Practice

The manual recommends a coordinated approach:

Set the volume potentiometer of the J9 to minimum before starting
Also set the output of your mixer to minimum
Gradually increase both together to the desired level

Using the LED OVERLOAD

The J9 has a LED OVERLOAD (item 5 on the back panel) that alerts you in case of overload. The manual states: "If the LED flashes frequently or stays on continuously, lower the signal level to avoid distortion".

This is your best real-time indicator. If the LED lights up, lower either the J9's potentiometer or the level of your mixer.

Built-in Protection

The J9 does have a limiter and overload protection, but this is not a reason to push the input levels. This protection prevents harsh clipping; it does not replace good level management.

Question 6

How to adjust the volume of the RCF EVOX J9 at startup and during use?

Accepted Answer

Initial adjustment before starting

Before turning on the speaker, ensure that the MAIN LEVEL potentiometer is set to minimum (towards the -∞ position). This is a mandatory step to avoid sound spikes at startup.

Recommended startup procedure

Set the volume of the RCF EVOX J9 to minimum
First, turn on your mixing console
Then turn on the speaker
Gradually increase the volume to a level suitable for your environment

During use

There is no fixed setting of “half or full”. Adjust the volume according to:

Your environment
Your type of event (check the three available presets: LINEAR LIVE for natural sound, CLUB for enhanced bass, VOICE for speeches)
The input signal from your mixing console

Protect your speaker from distortion

Watch the LED OVERLOAD. If it blinks frequently, the input signal is clipping. In this case, lower the output level of your mixing console to avoid distortion. The speaker has a built-in limiter that protects you, but you must maintain a proper input.

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