Hairball Audio ASP.4 User manual

ASP.4 for Linkwitz LX521.4 Speaker System

Your ASP.4 is designed to provide a lifetime of enjoyment in conjunction with your Linkwitz L 521
Speaker System. Place it in a cool, dry, and clean place away from heat sources, direct sunlight, moisture
or dust.
CONNECTIONS:
The ASP.4 is powered by an external switch mode universal power supply that provides the required
voltages through a DIN plug. Insert the DIN plug into the ASP.4 with the arrow facing up. Use the
appropriate IEC power cable into the power supply according to your region. The ASP.4 remains powered
on as long as the power supply is connected to the ASP.4 and to your mains voltage. If the mains voltage
is switched on and off, ensure that the ASP.4 is powered on prior to powering on your power amplifiers
to avoid damaging thumps or pops.
An analog source is connected to the unbalanced INPUT connector or the balanced LR connector
depending upon which version you have purchased. Please note that the unbalanced input cannot be
used with a balanced unit unless the internal connector is disconnected first. The stereo channels are
marked 1 and 2. It does not matter which one you choose for left or right but be consistent with
whichever one you choose.
Next, connect eight to ten power amplifier channels to each of the ASP.4 outputs in a way that
corresponds to their connection to the L 521 speaker system. Refer to your L 521 construction plans if
you have any doubts. Double check to confirm their correct connection. Keep the connection lengths
short without remaining taut or compromising air flow around either component. While the ASP.4 is not
particularly prone to hum or noise pickup it is best not to place it too close to large transformers or other
noise sources.
Refer to the L 521 Owner Support page (URL is in your L 521 Construction Plans). Item 30 dated 1 June
2015 on that page links to the L 521.4 supplement page. At the bottom of that supplement page is the
updated driver wiring for the .4 revision. Wire the drivers according to the diagram on that page.
Power on your audio source, make sure the power LEDs on the ASP.4 are lit, then power on the power
amplifiers last. Enjoy!