Ovation 1721 User manual

Ovation High Fidelity User Manual
Engineered for Art™

Model 1721 Stereo Power Amplifier Owner’s Manual
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O V A T I O N
H I G H F I D E L I T Y
Engineered for Art™
Model 1721 240 Watt Stereo Power Amplifier User Manual
May 2017 rev 1.0

Model 1721 Stereo Power Amplifier Owner’s Manual
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Welcome to Ovation High Fidelity.
Thank you for purchasing this Ovation High Fidelity product. We have taken
every care in the design, engineering and manufacture to ensure the highest
levels of craftsmanship and quality so that you will have many years of trouble
free operation and musical enjoyment.
Proof of Purchase
Should the item be returned under warranty, proof of purchase will be required.
Therefore, you must keep the original purchase receipt. We suggest you staple
this into the rear inside cover of this user manual and retain it in a safe place
after reading it. We always include a hardcopy of the purchase invoice with
every shipment.
Product Usage Declaration
This product is designed for use in a domestic hi-fi system driving loudspeakers
with a rated impedance of 8 Ω.
Warranty: -
•This product is warranted free of manufacturing defects for a period of five
years from date of purchase.
•This warranty excludes cases where the product is abused, or used for
purposes other than which it was intended, or modified in anyway
whatsoever
•The warranty is not transferable
•Remote controls are warranted for a period of one year from date of
purchase. The warranty does not cover damage due to battery leakage or
battery replacement
•The costs of sending the product back to the company under warranty, and
its subsequent return, are for the account of the purchaser

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Returns Policy/30 Day Money Back Guarantee
Should you not be 100% satisfied with your product for any reason, you may
return it within 30 days from date of purchase for a full refund, provided:-
•The product is returned packed in the original packaging
•The product is not damaged in anyway whatsoever either electrically
or cosmetically
•The company reserves the right to deduct from the refund any costs
required to make good any damage to products returned by
customers.
•The costs of returning the product back to the company under the 30-
day money back guarantee are for the account of the purchaser.
The Ovation High Fidelity Company reserves the right to modify and/or make
technical and/or design changes to the design of its products without
obligation to prior purchasers

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Unpacking Your New Product
Do not damage the carton, associated packaging materials or any
documentation. Retain these items in a safe, dry place until after your
30 day money-back guarantee has expired.
Check that you have the following items in the carton once opened: -
•Model 1721 Power Amplifier Unit
•IEC mains lead with appropriate mains plug for your region
•User manual (this document)
•Registration warranty card
Where to Locate Your New Model 1721 Stereo Power Amplifier
Locate your Power Amplifier in a well-ventilated area away from sources of
heat, dust and humidity and direct sunlight. You should position the product
alongside your preamplifier. We do not recommend that you stack high
fidelity components on top of one another as this could interfere with
ventilation.
You may not place any Ovation High Fidelity product directly on a
carpet as this will obstruct airflow and will lead to overheating.
This amplifier will run warm to the touch –this is quite normal.
Make sure when locating the product, that no liquids or any other foreign
objects can enter the unit through the ventilation holes.
Keep this equipment out of the reach of children.

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Warning!
Ovation High Fidelity products contain no user serviceable parts.
There are lethal mains voltages present inside the unit.
DO NOT open the product under any circumstances - If faulty, refer it
back to Ovation High Fidelity if still within the warranty period or to a
qualified, authorized service engineer if not.
This product must be Earthed (Grounded) when in use. Use the
supplied country specific mains cable to ensure this.
Never use an ‘Earth Lifter’ (‘Ground Lifter’) or any similar device that
interferes with the electrical safety of this product
If you are not going to be using your equipment for any length of time –e.g.
going away on vacation - it is advisable to unplug it from the mains.
Cleaning your Ovation High Fidelity Product
1. Unplug the unit from the mains supply
2. Use a soft, slightly damp cloth or chamois leather wipe to clean the
unit.
3. Use a dry, lint free cloth to wipe the unit down after step 2 is
completed
4. Never use any abrasive cleaning agent to clean the unit –e.g. Cif,
Vim, CLR or Softscrub
5. Never use furniture polish or similar oil based agents to clean your
unit
6. Never use any solvent based cleaner like petroleum (i.e. gasoline),
turpentine, benzene, methylated spirits or similar

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Model 1721 Front Panel
Model 1721 Rear Panel Key
The figure above identifies the key components on the Model 1721 power
amplifier rear panel.

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Connecting a Preamplifier to the Model 1721 Stereo Power Amplifier
The figure above shows how to connect your Model 1721 power amplifier to
your preamplifier.
Note that you do not need to connect both the single ended and the
balanced interconnects –you only need to connect the single ended inputs
or the balanced inputs.
We recommend where possible, you use balanced interconnects for best
performance.
Always make sure that you have the ‘Input Select’ switch on the rear panel
in the correct position –depressed for balanced inputs and out for single
ended (aka unbalanced) inputs.
We recommend the Ovation High Fidelity Model 1501 High Resolution
Stereo Preamplifier for use with the Model 1721 Power Amplifier.
Connecting Loudspeakers to Your Model 1721 Stereo Power Amplifier
Your Model 1721 Power Amplifier is designed for operation with 8 Ωrated
loudspeakers. You should only connect 1 pair of speakers to your amplifier
for best performance. Note that during the short power-up and power down
periods, the loudspeakers are automatically disconnected from the amplifier.
Balanced
Input
Connections
Unbalanced
Input
Connection

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Powering ON and OFF
To power up the amplifier, depress the black pushbutton located in the
center of the front panel. The GREEN indicator LED beneath the pushbutton
switch will flash twice per second for 5 seconds. You will hear a click after
3 seconds or so - this is the in-rush power limiting bypass relay energizing.
After a further second or two, the amplifier output will engage, allowing
sound to come from the loudspeakers. The front panel GREEN LED will
remain ON.
To power down, simply press and release the push button again. The power
in-rush relay will click as it de-energizes; the amplifier will disengage the
loudspeakers and the GREEN indicator LED will slowly extinguish over the
course of about 60 seconds.
Front Panel LED Status Indicator
The status of your amplifier can be determined from the front panel LED as
detailed in the table below:-
Front Panel LED Indication
Amplifier Status
OFF
Amplifier is powered OFF
GREEN and flashing twice
per second
Amplifier is in power-up cycle which lasts for 5 seconds
GREEN ON (i.e. not flashing)
Amplifier is powered up and loudspeakers are connected
to the output
GREEN but then flashing
RED intermittently on loud
music
Amplifier output is clipping i.e. overloading –reduce the
volume
RED and flashing at 1 Hz
The amplifier is too HOT and may automatically
disconnect the loudspeakers if you continue to play the
music too loudly or do not dramatically improve the
amplifier ventilation. Do not use your amplifier on a
carpet as this block the underside ventilation holes and
can lead to overheating
RED and ON continuously
The amplifier has automatically disconnected the
loudspeakers either due to over-temperature, overcurrent
or a DC output offset fault
Table 1 –Status Indication
Your amplifier is equipped with sophisticated protection functions that
include DC offset detection to protect your speakers, output short
circuit/overcurrent protection and overtemperature protection. If any of these
protection features are activated, the unit will automatically disconnect the
loudspeakers.
See the next page for additional details on the protection features

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About the Protection Features on Your Amplifier
Overcurrent Protection. If the load impedance of the speakers drops
significantly below 2 Ωwhen the amplifier is sustaining full output power or
the connection from the amplifier to a loudspeaker experiences a short
circuit, the amplifier output stage protection circuit will activate. This will
instantly disconnect the loudspeakers from the amplifier to protect it and the
speakers from damage. The LED on the front panel will remain illuminated
RED if this happens.
The amplifier will have to be powered OFF for at least 3 to 5 minutes before
it will power up normally again.
Note that if the cause of the problem is a short circuit in your loudspeaker
connection, the amplifier will shut down again when re-applying power. You
should therefore always check carefully to ensure you do not have a short
circuit in your loudspeaker connection after a shutdown.
Overtemperature Protection. If the amplifier heatsink temperature exceeds
65  C (this is too hot to touch, but in normal operation it is highly unlikely to get
this hot), the front panel LED will flash RED twice per second while above this
temperature.
If you do not reduce the volume, or allow the amplifier to cool and the
temperature continues to rise, it will disconnect the loudspeakers at 70  C. The
loudspeakers will not be re-connected until the temperature of the heatsinks
drops below 63  C. Do not locate your amplifier directly on a carpet when in use.
This blocks the ventilation holes and severely restricts airflow through the
amplifier which can lead to overheating.
DC (Direct current) Offset Protection. If the amplifier develops an internal
fault, and outputs DC to the loudspeakers, the internal protection circuit will
immediately disconnect the loudspeakers and the front panel LED will
illuminate RED and remain ON. The loudspeakers will remain disconnected
until the DC offset ceases. If the LED remains illuminated and RED even
after powering down and then up again, you should get in touch with Ovation
High Fidelity through the ‘Contact’page on our website.
Attention: Playing music at excessive volume levels can damage your
hearing.