Krell Industries KSP-7B Owner's Manual page 9

The KSP-7B has a limited warranty of five years from the date of purchase.
Please return the completed warranty card immediately after successful
installation and operation are completed.
The warranty for KRELL products is valid in the country to which they
were originally shipped and at the factory. If you think there are problems
with your unit, please contact your dealer or the factory immediately.
Should your unit need to be repaired, contact the factory or your dealer
(distributor) for a return authorization. Freight to the factory or dealer
(distributor) is your responsibility. Return freight to you will be paid by the
factory or distributor.
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