Most Earthquake subwoofers have dual subwoofer signal input. This serves several purposes.
1. It enables down-mixing of a 2 channel stereo signal into a mono signal that still contains all the original information that was in the stereo signal. This is useful if you have a stereo sub signal, but only one subwoofer.
2. It allows a LFE mono + stereo reproduction. When using two subwoofers, it is possible to use a Y-split LFE signal from the processor sub output. It is also possible to connect the sub placed in the left side to the main-out left from the processor (the output is also used to connect an external effect block to the left front speaker). The same can be done for the right side. The advantage here is that you get to keep both the dedicated LFE signal as well as your left and right stereo bass. This gives a 3D bass rendering many will regard as a significant upgrade.
3. Dual input allows the subwoofer an extra sensitivity adjustment. Normally, it would be enough to use a mono LFE subwoofer signal from its processor. If you have a processor with very low output so you can use a Y-splitter. By using both inputs with the same mono signal doubles the subwoofer sensitivity. This means that there is now only half the signal strength to drive it to full output.
Dual input allows the subwoofer an extra sensitivity adjustment. Normally, it would be enough to use a mono LFE
LFE
The low-frequency effects (LFE) channel is a band-limited audio track that is used for reproducing deep and intense low-frequency sounds in the 3–120 Hz frequency range. This track is normally sent to a subwoofer—a loudspeaker designed to reproduce very low frequencies.
https://en.wikipedia.org › wiki › Low-frequency_effects
subwoofer signal from its processor. If you have a processor with very low output so you can use a Y-splitter. By using both inputs with the same mono signal doubles the subwoofer sensitivity.
The extra connections are added for convenience to make wiring multiple subwoofers easier. If you have a vehicle like a Jeep Wrangler that is commonly upgraded with two separate subwoofer enclosures, being able to connect two sets of wires is easier.
The left and right inputs on a subwoofer are actually designed to receive a full range stereo source. This is when the crossover setting on the subwoofer would need to be calibrated according to the rest of the system environment.
For a line-level connection, you'll need to connect the sub to a preamp, integrated amp, or receiver with preamp outputs (usually labeled Pre Out). If you're installing only one sub, connect the amp's left- and right-channel pre-outs to the sub's left and right inputs.
Dual input allows the subwoofer an extra sensitivity adjustment. Normally, it would be enough to use a mono LFE subwoofer signal from its processor. If you have a processor with very low output so you can use a Y-splitter. By using both inputs with the same mono signal doubles the subwoofer sensitivity.
With properly located dual subwoofers, the respective modal patterns will overlap, which greatly increases the sound wave density in the room. The result is a smoother frequency response at more listening positions in the room, with less potential for obvious peaks/nulls in the frequency response.
If your receiver has one connector and your subwoofer has two, use the left connector. However, it is a good practice to use an RCA Y-adapter to connect to the left and right channels – some subwoofers will only play at half the volume or may enter standby mode more frequently when using only one side of the inputs.
If one of your speakers is wired up the wrong way it will be 'out of phase'. In other words it will be moving 'back and forth' while the other speaker is moving 'forth and back'. Your ears may not notice it but this results in the stereo seperation and sound quality not being as good as they could be.
These inputs are in parallel, which means that you can connect your amp to one (so it's an input) and then connect a second cab to the spare one - the parallel wiring means it acts as an output. This is called "daisy-chaining".
The optimal connection for a standard powered subwoofer is to use the RCA (Phono) "sub" or "woofer" line out found on home theater receivers and pre-amps. Some subwoofers offer "High Level inputs" (speaker wire connections) for use with a receiver or pre-amp without a sub RCA connection.
In order to hook up a powered subwoofer properly, an RCA "splitter" cable ("Y" cable) is not needed. Any single, standard RCA or subwoofer cable should do just fine. However, if the sub is exhibiting a hum with the RCA/sub cable plugged into it, then maybe try using a "shielded" subwoofer cable.
A 2-way speaker system contains two types of drivers (another word for speakers): a tweeter and a woofer. The tweeter is responsible for producing high-frequency sounds, typically handling the treble. Conversely, the woofer focuses on low-frequency sounds, dealing with bass.
Placing one subwoofer in the front left corner of your room and a matching sub in the front right corner will provide smoother, more consistent bass response as you move from seat to seat.
- 1/4 or 1/3 ADJACENT WALL PLACEMENT can give a blend of output and smoothness which could be advantageous in problem rooms. - DON'T put one subwoofer next to listening seats and one far away, as signals could cancel each other out and limit the output.
The ports just need to be facing air. Wavelengths are long enough that being in a cubbyhole or just near a wall won't make much difference. If the cabinet is touching the wall there could be buzzes or rattles as the cabinet shakes.
These two sets of terminals allows the speaker to be split into two independent sections. The split connects the mid and high frequency drivers to one set of terminals and the low frequency driver to the other pair.
If it is a powered subwoofer, then the two sets of terminals are for the left and right signals from your receiver. The subwoofer adds the two signals together to get a mono signal, then filters out the high frequencies, then sends the amplified low frequency signal to the speaker.
Align the phase of the main speakers and subwoofer
Reverse the polarity of the speaker by connecting the positive speaker wire to the negative terminal and the negative speaker wire to the positive terminal.
With only one coil hooked up, a dual voice coil speaker will suffer a loss in reference efficiency of about 3dB (only half the coil windings are being energized), as well as a significant shift in its Thiele/Small parameters.
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