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this may be a defective LED issue , if you're the 1st owner of the unit , the warranty is 5 years full , get in touch with your Dealer , let them troubleshoot the problem with Klipsch Technical Support .

the 2nd sub must only be connected to the SUB OUT jack , if you're using a wireless sub , plug the wireless transmitter into the "SUB OUT" -if all fails, the unit has a hardware defect . https://support.klipsch.com/hc/en-us/articles/360046083192-Bar-48-Adding-a-Second-Subwoofer

the Midrange horn of the Forte III -IV are identical , the Forte IV kit will reuse the Forte III horn with a new MF driver .

GLWYS , the speaker is in excellent condition .

you' re getting interference from the Antenna , there 's nothing much that you can do other than not use the speakers with this Antenna .

no problem , you 'll just use less power , bass may feel punchier .

The Chorus series cannot compare with CF series , basically , these are 2 very different speaker designs . Chorus is a 3 way conventional bass reflex 15 inch speaker while the CF series feature Neo magnet drivers in a 2 way D'Appolito design , problem is , there are no replacement parts for the CF Neo magnet drivers , but Chorus parts are plentiful

Step 1 - do a Factory Reset ▶️ https://support.klipsch.com/hc/en-us/articles/360044128312-Bar-48-Factory-Reset Press and hold the Power and Source Select buttons simultaneously for a full 10 seconds. Once complete, you will see the source LED light on the front of the bar turn Orange with three white LED's on top of it VIP -Performing a factory reset will clear all user paired devices. They will need to be re-paired after the reset is complete Step 2 -Update the Firmware ▶️ https://support.klipsch.com/hc/en-us/articles/360043401632-Bar-48-Firmware-V30-V83a-Update-Instructions

difference is the II at the end , same specs https://www.klipsch.com/products/rp-8000f-floorstanding-speaker-refurbished

something is odd with the copper badges , are the 2 badges identical ? or different

here 's a thread with a 1966 H700 Ser# 1D101 - therefore 2D121 = 1966 based on accurate Klipsch manufacturing codes

gone

Klipsch Parts will sell em to you at a decent price

given the poor condition of the grilles , screws with seated nylon washers can straighten the masonite , here is a picture of the Pro Klipsch speakers , the grille is straight as an arrow .

Klipsch tech support can be reached online ▶️ https://support.klipsch.com/hc/en-us