[X4U] Microphone Input - iMac 24

[Ken Johnson]

David,

Thanks for the fast reply.  The mic I want to use is just part of a headset I purchased for use with Skype.  Actually, I have 2 of these - different brands - neither works.  So - this means I need a pre-amp?  Or a USB (or bluetooth) mic/headset, I guess.

Ken


On Aug 3, 2010, at 4:27 AM, David Ledger wrote:

> 
> What sort of external mic?
> 
> Low impedance mics produce a very low output, but when used with balanced line cables and matching transformers they gave had the best interference rejection you could get cheaply 35 years ago (when I last worked as a professional theatre sound technician).
> 
> Some mics need 'phantom power', where the device the mic plugs into applies dc volts to the connection through a highish resistor. Don't think an iMac supplies that.
> 
> Many mics produce an output level close to line level. that's the sort of mic you want.
> 
> I have several mics from Sun workstations that won't produce a squeak with a Mac.
> 
> David
> 
> 
> -- 
> David Ledger - Freelance Unix Sysadmin in the UK.
> HP-UX specialist of hpUG technical user group (www.hpug.org.uk)
> david.ledger at ivdcs.co.uk
> www.ivdcs.co.uk