I have an Infinity Entra Sub for my home theatre system. Well a few (about 5) years back probably about 7 months after I bought it, from CIRCUIT CITY, it stopped working just had a loud annoying hum. so i took it back to get it fixed I bought a 1 year warranty for the sub and polk audio surround sound speakers and they tell me that I only bought the extended warranty on the surround speakers not the sub and they told me I would have to send it back to INFINITY to get it fixed but I wasn't going to pay the shipping to get it fixed. So it's just been sitting here unplugged and I figured I would tear it apart to see what the problem is. Well I hooked it up today and had the HUM so I unplugged the speaker on the inside and checked to make sure the speaker works and it works fine so the problem must be inside the amp, well when I hooked the speaker bac up there was no more hum, but it still won't produce any sound.
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Re: Inifinity Entra Sub not working
The hum can be from the power supply not properly filtering, and or the output stage also has a short.
There is the chance that the speaker driver coil is now burned, or the power supply is now dead. If ther output stage is shorted and was putting DC on to the speaker cone, this will burn it very easily.
You should sent the unit out and have it serviced, unless you are properly trained, have the service and engineering manuals, and the test equipment to follow up on a proper repair and calibration.
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Best to start at the beginning. You have it connected properly? Are you using the line level, direct or speaker inputs? What output on your receiver are you using?
Have you adjusted the volume control?
If you have everything correct, are you the original owner? It's an older model so if you are the original owner what happened when it stopped working? Noises, fade out, just wouldn't turn on one day.
Are you capable of doing some minor electrical work? Can you read a schematic? Can you recognise electrical parts? If the answer to any of these last three questions is no, you need to take it to someone that has the ability to do electrical repairs. If the answer to all three is yes you can fix this yourself.
No speaker spontaneously makes popping noises unless it is driven so hard the mechanical parts are crashing into each other. The amp is probably stressing out due to heat, which would explain the delayed onset of the symptom and its disappearance after a cooldown.
What they do NOT explicitly tell you is that the amp in the sub is not for your other speakers running off it's Speaker Level outputs. They're just there as a pass-through if you use Speaker Level from your own amp.
Line Level (RCA) IN to the sub will NOT pass anything out those Speaker level outputs.
I had the same problem. When I opened it up, the fuse was blown, and it was a pain to find the fuse it needs (3 Amp, 250 V slow-blow fuse, 5x20 mm). Also, the 2 large electrolytics (big purple things near the amp) and one small capacitor were all blown. For 4 fuses, bought seperately from, and the 2 electrolytics and 1 capacitor, it cost about $20, plus almost 20 more in shipping, which still isnt bad considering the original price of the sub. However, the tricky part is that you have to know how to use a soldering iron to take out the old components and put in the new ones.
This means that you have purchased a three piece home theatre system. Two tweeters and a sub-woofer. Assuming you are using a Stereo player (Tape/CD/DVC)you have to connect the Left Output of the Stereo placer to the Left Input at the back of the Sub-Woofer and the Right output to the Right input of the subwoofer by cables. Then take tweeters and connect them to Right speaker and Left speaker output at the back of the sub-woofer ( note if the speakers are marked L/R, then connect them to the subwoofer output accordingly. In case you are using a 5.1 player, then only connect the front right and front left to the Right and Left input at the back of the subwoofer. You are and you can now start playing your music or movies and and you will get theatre quality sound.