How long are the emitter cables?

3 meters, and can be extended with our ir extension cable in our store ,here you go : https://www.amazon.com/Repeater%EF%BC%8CIR-Extender-Repeater-%EF%BC%88Receiver%EF%BC%8CEmitters-Adaptor%EF%BC%89/dp/B07CT5TBNG/ref=sr_1_13?m=A3PRNU38RTZIQX&s=merchant-items&ie=UTF8&qid=1539578052&sr=1-13&th=

Can the receiver wire be extended 50-75 ft ?

Yes,the receiver wire is about 10 ft , you can extend the receiver wire to 50-75ft by using the extension cable in our store, here is the link : https://www.amazon.com/Infrared-Extension-Extending-Receiver-Emitter/dp/B07GZXK5MH/ref=sr_1_18?m=A3PRNU38RTZIQX&s=merchant-items&ie=UTF8&qid=1541265676&sr=1-18&th=1

Can I place the receiver behind an acoustically transparent projection screen?

OK - I placed a 4mm ( 1/6 of an inch ) thick piece of glass in front of my IR receiver head .... this had no effect on the ability to control my Video Recorder ... which is in another room at the end pf a 15m ( 49ft. ) audio extension cable. This Repeater is great - don't buy a cheaper one ... I have had to throw my cheaper one away - even with my Video Remote next to the IR receiver, it did not work. This Repeater is very good - it is switched off when not in use, is controlled from across the room when switched on, and from a distance of 5.5m ( 18ft ) works perfectly.

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