|Apparently the Boston Acoustics BA735 digital speakers are an older model that have an oddball way of connecting to a digital output via an 1/8" mini phone plug. They are not compatible with being plugged into a regular 1/8" jack for analog sound. Your mboard's onboard sound or sound card installed in a slot must have an oddball 1/8" jack for digital sound, AND that jack must have circuits that are compatible with the BA735's coaxial "electrical S/PDIF" requirements.|
Optical Digital Out and Boston Acoustics BA735 Speaker System
" *** Not all digital audio connectors are usable with each other! *** "
That has info about buying an adapter and using cables with it if the situation you have applies.
(Update to the link in that for the adapter you can buy:
Digital Audio Interface, S/PDIF Coax to S/PDIF Optical
If this is a desktop system......
- this excellent third party web site usually has an info page about the mboard:
You need to select the region the system was sold in and use the model number of your system to search with.
If he has the mboard info (click on the highlighted or underlined name of the mboard model in the list to go there) , if there is a manual listed under Downloads on the left side of the page, he does not allow downloads anymore, but you can search using the file name of the manual (at the end of the address where the file was supposed to be) on the web and usually find it.
- If you want to use these speakers with the emachines system, if the adapter mentioned in the above article can't be used for your situation, or if it's just too expensive for you, you probably need to buy an older PCI sound card model that has the compatible oddball 1/8' jack and circuits. The Boston Acoustics web site probably has info about that.
Or see the last part of the above article for the names of older Turtle Beach sound cards that are compatible with these speakers.
Turtle Beach Santa Cruz PCI Sound Card