Luna Speaker UMS-1

The bat or bird (on the other side of the mist-net and in the axis of the speaker’s radiation of the player) hears the familiar voices and curious / lured tho them it flies closer to the signal source, but on the way falls into the mist-net. Because of the direction of sound and ultrasound radiation from the loudspeaker – their intensity rapidly decreases beyond the axis of the speaker’s radiation. In addition, the intensity decreases the faster, the greater is the frequency of the transmitted signal. As a result, a bat  outside of the speaker’s axis (or behind the speaker, on the same side of the net) will not hear the reproduced signal and will not be lured / caught in the net. A similar situation is with audio signals and although the directionality for audible sounds is less, the use of an additional active speaker also increases the range significantly.

To remedy this problem, connect the active ultrasound speaker Luna Speaker UMS-1 to theLuna Lure UMP-1 or Luna Lure UMP-2 (using proper signal cable) and place it on the other side of the net:

Configuration with single or double channel / double speaker bat luring

Due to the fact that the Luna Lure UMP-2 uses a unique dual channel processing solution and two DACs (Digital-to-Analog Converters) in a single enclosure, two different types of work are possible when connecting an active external speaker:

• two-channel (stereo)/ two-speaker operation – the player’s loudspeaker reproduces the right channel (channel 1) from the file on the memory card (recorded as the dual channel / stereo WAV, FLAC or APE file), and the connected Luna Speaker UMS-1 plays the left channel signal (channel 2). This makes possible, for example, to play two different signals in different directions, which is closer to the situation in reality, because two bats can not give voices from the same place in space;
• one-channel (mono)/ two-(or more)-speaker operation – all devices: the speaker in the LunaLure UMP-2 player and the speaker(s) in the active speaker(s) Luna Speaker UMS-1 are reproducing the same signal from the recording on the memory card. To get this kind of work – the recordings should be prepared in the editor beforehand. You need to create single channel / mono recordings (you can also use stereo / dual channel recordings, but it should have the same signal in both channels, for example, after mixing them with each other).

This second mode of operation (mono) can be particularly useful when you need to increase the range of luring by placing the devices side by side at a short distance and pointing them in the same direction (the power of the radiated signals from the individual devices will add up). You can also direct the individual devices in different directions, thus reducing the directional effect of the loudspeakers. In this way, the width of the radiated ultrasound beam can be broadened.

The implications of using such a solution are many. For example, you can drive off two (or more) remote locations using only one Luna Lure UMP-2 player and one (or more) Luna Speaker UMS-1 connected to it. At the same time, the connection of the active speakers is cascaded – the first connected active speaker is connected to the second active speaker, second to third etc. The total cost of such a solution is considerably lower than that of using separate playback devices for individual (not so remote) locations. And because of the much lower price of active speaker (even with long signal cable) than the separate player this is the more cost effective solution as there are more points in the area where the catches are to be carried out.

Configuration of connecting three (or more) devices:

Standard configuration with single or double channel / multi speaker bat luring

In the above example, the “mixed” configuration is also possible, ie the Luna Lure UMP-2 player reproduces channel 1 / right and the Luna Speaker UMS-1 active speakers reproduces channel 2 / left.

The use of an active ultrasound speaker connected to a line-level source has the advantage (against the passive speakers in competing solutions) that the signal in low-current cable is not degraded (weakened and frequency-limited), as is the case with passive speaker connected via speaker cable. Thanks to this, the distribution of individual signal sources is not limited to a few meters. Losses in connection cables depend on many electrical parameters of the circuit, and most important is the ratio of cable impedance to impedance of the receiver / speaker (with the impedance of both components changing with frequency). For this reason, in the case of passive loudspeakers, already several meters of cable have large power losses, which are to be radiated by a speaker with a relatively low impedance (eg 4 ohm). When using a low-current signal cable, where the receiver has an incomparably higher impedance than the cable impedance, the signal can be transmitted at significant distances practically without loss (losses are imperceptibly small). This fact, as well as independent powering of the active speaker(s), causes longer operation of the whole system, without frequent battery replacement.