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If you are currently using the high-level inputs on your subwoofer amp to add a subwoofer to your
system, adding a DSP-LF might not be possible without modifying what equipment you're using. It is
possible to use a 3.5mm male to dual 3.5mm female cable (also known as an 'aux splitter') with the DSP-
LF, which might allow you to use the DSP-LF if you are currently using high-level inputs on a subwoofer
amplifier.
Output Audio Signal
The 3.5mm output jack on your DSP-LF should be hooked up to the line-level input to your subwoofer
amplifier using the provided stereo 3.5mm to RCA cable. If your subwoofer amplifier only has one RCA
jack instead of two (often labeled LFE), it is okay only to attach only one of the RCA plugs into your
amplifier.
If you have two subwoofers in your system, you can use a 3.5mm male to dual 3.5mm female cable (also
known as an 'aux splitter') or other types of "Y" cables on the output of the DSP-LF to hook up both of
your subwoofers. You could even use a typical 3.5mm male to stereo RCA cable, and use the white RCA
plug for one subwoofer, and the red RCA plug for the other subwoofer.
AV Receiver and Subwoofer Amplifier Settings
To avoid conflicts between the DSP-LF's settings and your AVR / subwoofer amplifier settings, make sure
to make the following adjustments on both before using your DSP-LF. If your AVR or sub amp supports
these settings, you will be able to find how to adjust them in that product's user manual/guide.
1.
Adjust the low pass dial to the highest frequency available on your AV receiver and subwoofer
amp to prevent interference between your plate amp crossover and the iWoofer crossover. It is
recommended to use the iWoofer software crossover as opposed to the crossover on your
subwoofer amp.
a.
Note: A low pass filter means that all of the frequencies below this value will pass
through, and frequencies above this value will be attenuated and then altogether
eliminated. This filter is essential for subwoofers and is one of the main things that
separates a subwoofer amplifier from a normal amplifier.
2.
Turn off any EQ settings your amplifier or AVR might have for bass to prevent interference
between these settings and the iWoofer software. In particular, EQ settings on an amp or AVR
will prevent you from getting optimal results from the iWoofer Pro's room correction algorithm.
3.
Turn off any additional processing you can find within your subwoofer amplifier or AVR unless
you are confident it will not conflict with any DSP settings in iWoofer.
4.
Note about AVR Crossovers: For many AV receivers, there will be a single ‘crossover’ frequency
setting that will high pass your main speakers at this frequency, and low pass the signal going to
the ‘sub out’ on your AVR. If this is the case for your system, you will want to utilize this
crossover, and set the low-pass frequency within the iWoofer app to 500 Hz (all of the way up).
It is important to high pass your mains with this crossover whenever possible to prevent
interference in the bass range between your mains and your subwoofer. Although it’s possible
to get a good response without high passing your mains, the iWoofer room correction algorithm
cannot account for the bass response of your mains, which is why we recommend high passing
them.
