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NOTES ABOUT HUM:
While the MA1240a has been designed to minimize the possibility
of hum in the audio system, it is still possible that a hum will oc-
cur in rare circumstances. Its safety grounding can create a path
for small amounts of 60 Hz energy to travel through the line-level
audio system. Although not dangerous, this energy can cause
diffi culty with the auto signal sensing circuit, and at the very least
will interfere with the quiet enjoyment of your system. The fi rst
course of action should be trying to make sure that all of the audio
components are connected to either the same electrical outlet, or
at least into the same circuit branch. Next, cable TV systems are
notoriously the culprit, so be sure to try disconnecting all coaxial
feeds that are connected to the system. If this solves the problem,
install a coaxial line isolator and reconnect the system. In the very
worst case, a line-level audio isolator/transformer connected to the
line-in of the amplifi er will usually solve the problem.
TYPICAL 6-ROOM INSTALLATION
IMPORTANT SAFETY INSTRUCTIONS
To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer
servicing to qualifi ed personnel. To reduce the risk of fi re and shock do not expose unit to rain or
moisture. The unit should be connected to an earth grounded AC electrical socket. The unit should
be operated in a well ventilated area. Minimum clearance is 2 inches from the ventilation openings.
Note: Unit is set at the factory for 120V operation. Be sure to change the fuse (4A rating) before
switching to 230V operation.
© Dayton Audio
®
Last Revised: 1/7/2015
daytonaudio.com
tel + 937.743.8248
info@daytonaudio.com
705 Pleasant Valley Dr.
Springboro, OH 45066
USA
Warranty Information
Dayton Audio products are constructed by industry experts, and are thoroughly tested before shipment. Dayton Audio products are warranted for the period of one
year. This warranty is limited to manufacturer defects, either in materials or workmanship. Dayton Audio is not responsible for any consequential on inconsequential
damage to any other unit or component or the cost for installation or extraction of any component of the audio system. In the rare case of a product failure, please
contact your place of purchase or call our Customer Support Department at (937) 743-8248.
Warranty Limitations
There are no other warranties, either express or implied, which extend the foregoing, and there are no warranties of merchantability or fi tness for any particular
purpose. The warranty will not cover incidental or consequential damage due to defective or improper use of products. This includes but is not limited to burnt
voice coils, overheating, bent frames, holes in the cone, or broken lead wires.
This warranty gives you specifi c legal rights and you may also have other rights which vary from state to state.
Non-Warranty Service: If non-warranty service is required, the product may be sent to the Company for repair/replacement, transportation prepaid, by calling (937) 743-8248
for details, complete instructions, and service fee charges.
SPECIFICATIONS:
Rated Power Output: 40 watts per channel RMS at 8 ohms
Bridged Power Output: 80 watts per channel RMS at 8 ohms
(8 ohm minimum)
Input Sensitivity:
380 mV for full output with all level controls at max.
Input Impedance: 18K ohm
Frequency Response: 5 Hz to 72 kHz
Distortion: .005% THD 20 Hz-20 kHz @ 30W (8 ohm)
Distortion (Bridged): .010% THD 20 Hz-20 kHz @ 80W (8 ohm)
Channel Crosstalk: 80 dB
Signal to Noise Ratio: 105 dB A-weighted
Effi ciency: 63%
Power Requirements: 115/230 VAC, 60 Hz/50 Hz
Stand-By Power Rating: 115V, 0.264W *
Auto Turn-On Sensitivity: 13.7mV
Dimensions: 16.7” W x 4” H (including feet) x 14.25” D
Weight: 33 lbs.
* The MA1240a complies with the ENERGY STAR and CE EuP directive.