Dayton APA150 User Manual

Specifications:

Power Output: 75 watts RMS x 2 into 4 Ω
150 watts RMS x 1 into 8

Total Harmonic Distortion: Less than 0.01%
(20-20,000 Hz)

Signal-to-Noise Ratio: >100 dB, unweighted

Crossover: Variable 50-150 Hz,

18 dB/octave

Auto-On Sensitivity: 3 mV

Auto-Off Delay Time: 15 minutes

Input Impedance: 47 k Ω ±5%

Line-Out Frequency Response: 20-20,000 Hz (-3 dB)

Maximum Noise and Hum: Less than 1 mV with gain at maximum

and input shorted

Minimum Clearance for Ventilation: 2”

Electrical Requirement: 120V 60 Hz, 230V 50 Hz (switchable)

Dimensions: 5.6” H x 5.7” W x 12.8” D

Ω

150 Watt Audio Amplifier

Weight: 11.05 lbs

Notes About Hum

The addition of a new component to an existing system can sometimes result in an
audible hum. While it would be easy to assume that the new product is at fault or even
defective, it is usually just an indicator that it is time to take a closer look at the overall
grounding of the audio system. To start with, verify that all audio equipment is on the
same AC power circuit. The outlets in an area may or may not all be on the same breaker.
Always make sure that all equipment grounds are in good condition, and NEVER remove
the ground pin from a power plug. There are some cases where the actual power line has
some form of interference, but the most common cause of noise is a ground loop. The
cable TV line can be the cause of hum in multi-source home audio/video systems. Just
temporarily disconnect the cable line, and if the hum stops then the use of an inline isola­tion transformer is suggested. The key is to proceed slowly and step by step, taking care
to identify which cables or combinations of cables cause noise when connected.

Warranty

The Dayton Audio APA150 warranted free from defects in material and
workmanship for one year from date of purchase. Warranty does not apply
to misuse, abuse, neglect, accident, improper use, etc.

Dayton Audio©

APA150

•

PO Box 52 • Springboro, Ohio 45066

© 2007 Dayton Audio

300T812

®

Thank you for purchasing the Dayton Audio APA150 Audio Power Amplifier. This
amplifier offers a new level of high fidelity performance and versatility previously
unattainable at this price. Power output is 75 watts x 2 into a stereo 4 ohm load, and
150 watts x 1 into a bridged-mono 8 ohm load.

Versatility was the primary design goal when engineering the APA150. Configured
in stereo mode, amplification is provided to a pair of speakers for stereo or front/rear
surround playback. Switching to the bridge-mono mode configures the APA150 for
powering a center channel speaker, or a subwoofer/tactile transducer when used
with the on-board low pass filter. Additionally, the full-range line-level outputs
allow for daisy chaining amplifiers for a multi-zone whole house audio system. A
small form-factor chassis consumes less space than conventional amplifiers making
placement options virtually endless.

Features:

Key features of the APA150 include high current discrete power transistors (used in pre­mium amp designs), a hefty toroidal power supply transformer, low-noise forced air cooling,
a fully adjustable and defeatable electronic 50-150 Hz low-pass filter, extensive heat sinks to
extend the amplifier life, and complete protection against shorting and thermal overload.

Additional features found on the APA150 include full-range line-level outputs, gold-plated
5-way binding posts that accept up to 8 AWG wire, gold-plated stereo line-level inputs and
outputs, user-selectable input voltage of 120/230V.

Connecting the APA150

Connecting a line-level device

1. Locate the RCA line-level output from your source device.

2. Using RCA patch cables, connect the appropriate channel from the source output to the
amplifier input.

3. For a mono line-level signal, use the left channel line-level input.

Daisy-chaining APA150s

1. Connect the line-level input from source device as above.

2. Connect the line-level output from first amplifier to line level input on the second amplifier.

Using the APA150s low-pass filter

1. Ensure Low Pass-Flat switch is set to Low Pass.

2. Connect line-level input from source device.

3. Connect loud speakers as described below.

4. Adjust crossover frequency until desired output is reached.

Connecting your loudspeakers for stereo operation

1. Ensure that the amplifier is powered down.

2. Remove approximately 1/2” of the insulation from your speaker cables’ positive and
negative conductors.

3. Loosen the speaker binding posts by turning the knobs counter-clockwise, exposing the
wire insert hole.

4. Observing polarity, insert the conductors into their appropriate binding posts and tighten
the knobs down, securing the conductors in place.

Connecting your loudspeaker for bridged-mono operation

1. Set the Mono-Stereo switch to Mono position.

2. Remove approximately 1/2” of insulation from your speaker cables’ positive and
negative conductors.

3. Loosen speaker binding posts by turning the knobs counter-clockwise, exposing the
wire insert hole.

4. Connect positive conductor to top left binding post.

5. Connect negative conductor to bottom right binding post.