How to install my 5.1 speaker system

Headphone jack on all current Mac models (include latest aluminum iMac) doubles as SPDIF digital optical output as well. In other words, both analog (for headphone/line-out) and digital audio outputs are built into the same combo jack. Same analog/digital implementation for the audio input jack. Alternatively audio output can be sent through USB bus in digital form to external decoder. Thus unlike PC, the compact iMac does have many extra features already built-in.

All you need is an external 5.1 decoder to decode 5.1 digital output from headphone jack or USB port into analog format with three analog outputs for Creative Inspire T6060 5.1 speaker set (woofer/centre, front L/R, surround L/R). The only such decoder I have come across is Tutle Beach's Audio Advantage SRM (www.turtlebeach.com) though there are many surround audio decoders/receivers (mostly with SPDIF optical outputs) on sale in audio equipment shops. Take note that Creative Inspire T6060 is active speaker (amplifier built-in) whereas outputs from some surround decoders/receivers are meant for passive speakers. The difference is between low line level outputs (for active speakers) vs high amplified outputs (for passive speakers).

Optical Toslink cable with two different connectors on both ends (standard Toslink / 3.5mm Mini Plug) is required to connect between headphone jack output and external 5.1 decoder input. In case when USB port is used, any good USB cable built for peripherals (printer, external drive etc) will do.

Since I never play game and hardly watch movies with my new aluminum iMac, only good stereo audio is required for music appreciation with following setup:

iMac USB port -> Firestone Fubar3 DAC -> Firestone Tube Head Pre-amplifier (vacuum tube) -> Harman Kardon SoundStick2 speaker

Hope the information will help.

Hi there. I recently hooked up what used to be a Klipsch Promedia 5.1 Ultra system to two computers, my Mac Mini and my gaming PC. Initially, I simply took a standard stereo miniplug cable from the audio out jack on the mini and hooked it in to the headphone in slot on my Klipsch. However, this was only an analog stereo connection, without even any 5.1 emulation software. It sounded fair. This would be the easiest solution for you, although it really doesn't take advantage of your system.

For me, I wanted better sound than the stock underpowered amp was giving to my system, so I bought an open-box Denon A/V receiver for an unbelievable price and hooked it up the speakers. I also had a SVS 10" sub around to connect.

To connect the Mac Mini to my new receiver-based 5.1 system: I went to Fry's and bought a standard Toslink-Toslink optical cable by GE that actually came with the mini-Toslink adapters (3.5mm plugs). I connected the Mini optically to the optical in on my receiver. The Mini automatically detected the optical connection and sent it through. I now have a digital connection that while is only stereo initially, the receiver takes and puts in 5.1 via Dolby or DTS. It truly sounds marvelous. Also, while i haven't tested it yet, I do believe a DTS/DD DVD will pass-through in full 5.1 beauty.

The gaming PC digital audio solution is...well, to nobody's surprise (here, anyway), much more complex. I won't bother boring you with the details.

I hope I was slightly helpful, although I know you have a different setup. Good luck!

I used the Griffin Firewave decoder to use my 5.1 PC speakers on my iMac.

Hi, I just tried connecting my new IMAC using Xtreme toslink (comes with 3.5mm adapter)to my Denon AV receiver but nothing comes out.
Can you tell me what I am doing wrong?
I tried different ports in my denon just to be sure but to no avail.
Actually there is no red light coming thru the cable. Again what am I doing wrong?
Checked the audio setting it says digital out.
Pleas help

Thanks
James