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Power and Versatility
The élite EF-Series powered cabinets are bi-amped full-range loudspeakers with built-in two
channel mixers. Using Class D switching technology the overall efficiency of the amplifiers have
been greatly improved over other designs. The low frequency amplifier used for the woofer in
the EF12P and EF15P delivers over 900 watts (400 watts for the EF10P). The amplifier for the
high frequency amp uses three-tier linear technology and is rated at 300 watts (100 watts for the
EF10P). This Class H amplifier drives the titanium diaphragm horn drivers helping to reproduce
clean transients while keeping up with the high output of the woofers.
The combination of Class D and Class H amplifier technologies used on the élite EF-Series
powered cabinets help keep distortion to a minimum while reducing the need for massive
heat dissipation. In fact, to a level low enough to eliminate the need for heavy heatsinks. The
advantage of this unique combination of three-tier and Class D amplification has reduced
extraneous heat to the point that an EF-Series powered cabinet can easily be used in almost
any orientation (close to walls, floors and in close arrays with multiple cabinets). Competitive
active loudspeakers (with large finned heatsinks) typically need to be operated vertically and
with plenty of clearance to ensure proper ventilation and heat dissipation. Having greater
flexibility with the orientation of the enclosure makes the EF-Series powered cabinets ideal for
flying in clusters and point-source concert sound systems. This all works because Yorkville’s
designers took extra care making sure that in tight clusters overheating would not be an issue.
As a bonus, the élite EF-Series powered cabinets have a built-in audio mixer allowing
microphones and/or line sources to be used directly. Additionally, the Link system allows
additional powered cabinets to be driven from a single source (up to a maximum of 16
EF-Series powered cabinets).
Note: a maximum of 3 mixers can be used when Linking EF-Series powered cabinets
USER Tip: When a pair of EF-Series powered cabinets are Linked you can use both mixers
integrated on each cabinet. This allows you to have up to two microphones and two line inputs.
As mentioned, our active cabinets can be linked together, one limitation is a maximum of three
‘mixers’ can be active at any one time. This means up to 3 Mic sources and 3 line sources are
available in an array of three or more cabinets. The microphone inputs have equalization and high
pass filtering designed for vocal applications. The Master level control is used to adjust the levels
of individual powered cabinets. This is invaluable in applications where large numbers of cabinets
are used such as in clusters or in trade show applications (or when EF-Series powered cabinets
are used as repeater cabinets or for side-fill).
To make it easier to add subwoofers to the EF-Series powered cabinets a 100 Hz high pass filter can
be activated. This allows the cabinets to be used more efficiently with almost any active subwoofer.
1. Configuration
EF-Series powered cabinets can be used stand-alone or in multiples by using the Link
connectors. The built-in mixer has a microphone input and two (combined) ¼-inch inputs for
line sources such as CD players sources (optimized for CD, laptop computer or a tablet/phone
audio source). An external mixer can be used by disabling the internal mixer. Advanced signal
processing is used to give maximum performance at all levels. There’s a switch to provide a low
frequency roll off if you’re going to use the EF-Series powered cabinet with a subwoofer.
2. Power Switch & Mode LED
The switch turns the power On or Off and the illumination of the Mode LED indicates that unit is on.
Note: When Linking cabinets, if one in the chain is turned off, some hum or buzz in the other
cabinets may be audible.
3. Limit LED
There are separate limiters for the woofer and horn amplifiers, this LED indicates operation
of either limiter. The amber LED indicates that the cabinet is operating at full power and the
limiter(s) are actively reducing the signal level. Operation into slight limiting is acceptable as long
as the clip light is flashing and not constantly illuminated.
Note: The Limit LED does not indicate low frequency processing action.
