Eden DC-210XLT Metro - Manual (Page 15)

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It will actually take about 24 to 50 hours of total playing time to fully break
in your speaker system. If desired, you can plug a CD player into your
amplifier and play a CD through your enclosure to accomplish this break-in.
Connections With Additional Cabinets – It is important to keep two issues
in mind when using your DC210XLT combo with other speaker cabinets:
phase relationships and impedance. Proper parallel connections require the
positive and negative speaker terminals to maintain their relationships
throughout the system. This means that the positive connection (tip on _ in.
plugs) on one cabinet must connect to the positive connection on additional
cabinets. The negative connections should be made in a similar manner.
Unless you have defective cables, _ in. connections make incorrect
connections highly unlikely.
Impedance is a measure of the load your speaker system places on your
amplifier. Too great a load (indicated by a lower impedance figure) can
damage your amplifier. Too small a load (indicated by a higher impedance
figure) can fail to draw adequate power from your amplifier. Please consult
your amplifier manufacturer’s literature for impedance recommendations.
We hope this means you’ll be consulting another one of our manuals, by the
way. If this is not the case, may we humbly suggest you trade up to a better
amplifier?
When you connect speakers in parallel, the load increases as shown below:
Parallel speaker configurations Total system impedance
Two 8 ohm cabinets 4 ohms
One 8 ohm cabinet and one 4 ohm cabinet 2.6 ohms
Two 4 ohm cabinets 2 ohms
Three 8 ohm cabinets 2.6 ohms
Two 8 ohm cabinets and one 4 ohm cabinet 2 ohms
One 8 ohm cabinet and two 4 ohm cabinets
1.6 ohms – NOT Recommended!
IMPORTANT NOTE: The impedance of the internal speakers is 8 Ohms.
Remember to factor this in when determining total impedance with
additional cabinets.
Suggested Speaker Systems – Your extension speaker system(s) should be
chosen to accommodate the characteristics of your amplifier and your
predominant application. If you will generally be using a single extension
cabinet, it should both be an 8 Ohm model so the combined impedance will
be 4 ohms.