Radio Shack 32-2001 Owner's Manual

Owner’s ManualPlease read before using this equipment.MPA-40 20-Watt PA Amplifier32-2001.fm Page 1 Friday, February 4, 2000 7:53 AM

10You need a separate transformer foreach speaker.Line transformers have several connec-tors called taps.The primary taps (on one side of thetransform

113. Connect a wire from the speaker’spositive (+) terminal to the trans-former’s secondary tap thatmatches the speaker’s total imped-ance (4, 8, or 1

12ˆTroubleshooting If you should run into difficulties, checkthe wiring of the system. Are there anyshort circuits in the speaker wiring?Have you prov

13ˆCare and Maintenance To enjoy your amplifier for a long time:• Keep the amplifier dry. If it gets wet,wipe it dry immediately.• Use and store the a

14ˆSpecifications Output Power at 1 kHz, 10% THD ... 20 WattsTHD at 1W, 1

15ˆNotes32-2001.fm Page 15 Friday, February 4, 2000 7:53 AM

32-2001811081640B02A00Printed in ChinaRadioShackA Division of Tandy CorporationFort Worth, Texas 76102Limited One-Year WarrantyThis product is warrant

2ˆContentsFeatures ... 3Preparation ..

3ˆFeaturesYour RadioShack 20-Watt PA Amplifiergives you 20 watts of solid power foryour PA system. Its wide frequency re-sponse easily handles amplifi

4ˆPreparationPRESETTING THE CONTROLSWarning: A sudden high output from theamplifier could damage your hearing orthe speakers connected to the amplifi-

5PHONO/AUX/CD Switch — select theinput source. Even if you connectedauxiliary equipment to both the PHONOand AUX/CD input jacks, you can useonly one s

63. Touch the positive end of a 1.5-voltflashlight battery to the speaker ter-minal that does not have the wireattached to it.4. Touch the negative en

7• If you connect more than two speak-ers using only series or only parallelconnections, the total impedancemight exceed the amplifier’s maxi-mum impe

8you can make the correct connection.The total impedance of all the speakersmust match one of the amplifier’s outputterminals (4Ω, 8Ω, or 16Ω).Speaker

9If you connect four 8-ohm speakers inseries, the total impedance is 32 ohms(8 + 8 + 8 + 8 = 32). This exceeds themaximum rating.If you connect these