Midterm Exam
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| What does the term Loop Unity Gain refer to? | the point where a loudspeaker reinforcing a source and the sources level are equal at the mic capsule. | |
| Name three things that factor into the potential for feedback. | Mic Response, Speaker Response, acoustic environment | |
| What does the term Equivalent Acoustic Distance refer to? | represents the distance of the closest possible listener, an arbitrary distance used to estimate needed acoustic gain | |
| What is potential acoustic gain? | the amount of acoustic gain a system can achieve before feedback | |
| How does changing the distance between the mic and the source affect acoustic gain? | double the distance loose 6db, half the distance gain 6db | |
| How does the number of open mics on stage affect acoustic gain? | double the mics loose three db, more mics equals less gain before feedback | |
| What is critical distance? | point where direct sound is equal to reverberant sound | |
| In what four ways is EMI transmitted or introduced into an audio system? | magnetic field coupling, electric field coupling, Electromagnetic radiation, common impedance coupling | |
| What are some ways we can reduce levels of EMI? | figure 8 cables, cross at 90 degrees, shields, fix pin one problem, separation, Balanced Interconnection, Isolation | |
| Explain how a balanced differential input is able to reduce EMI. | Through common mode rejection | |
| What is the most common system used for technical grounding in an audio system? | Isolated Star grounding | |
| What is the pin one problem? | XLR input and output pin one tied to circuit ground | |
| What is the solution to the pin one problem? | tie XLR input and output pin one directly to chassis ground | |
| What is the maximum recommended length of an unbalanced cable run? | 10 feet | |
| What does balanced stand for? | equal impedance compared to ground | |
| Name some job duties of a tour manager | In charge of tour, oversee travel planning and lodging, take care of band and entourage, oversee merchandise, enforce contract | |
| Name some job duties of a production manager. | In charge of tour personnel, equipment transportation, setup production office, advance, dressing rooms | |
| Name 4 advantages of using fiber optics over copper cables | low attenuation, high bandwidth, immune to EMI, secure connection | |
| Name two methods used to splice fiber cables. | Fusion(melting) Mechanical(gluing) | |
| Name five basic enclosure types | Diploe, sealed, vented, combination | |
| What does Fs signify? | Resonate frequency of the driver and peak impedance of the driver | |
| What is Vas? | amount of air in cubic feet having the same compliance as the drivers suspension | |
| What is Qts? | total resonance magnification at drivers Fs. | |
| What does the parameter Xmax signify? | maximum amount of drivers cone excursion in millimeters | |
| What is a face? | a collection of vertices that make up a plane that has acoustic properties |
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