Dayton Audio APA150 150W Power Amplifier User Manual

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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 pre-

mium 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.