I use these 
http://www.amazon.com/V-MODA-Faders-Tuned-Earplugs-Electro/dp/B007RRTO2Y/ref=sr_1_9?ie=UTF8&qid=1443014097&sr=8-9&keywords=er+20+ear+plugs
 in the equipment room, You can still hear,  just brings the level down to a 
manageable level. Looks like a pair of headphones.

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