Quote:
Originally Posted by Technic
OP's system is the Stereo, where the iDrive powers the 6 speakers (front, rear and underseat) directly with just 25W per 4 channels; no tweeters and no external OEM amp.
The Stereo underseat woofers are connected in parallel to the door mids, thus the 4 wires at the woofers. All mid and underseat speakers are 4 ohms in the Stereo system, but because the front and the underseat woofers are connected in parallel the iDrive front load is 2ohms. The iDrive is stable at 2 ohms.
Why all this explanation?
When you replace the OEM speakers in the Stereo system you are actually changing as well the load to the iDrive unit. Because the front and woofers are connected in parallel then things could get messy if the load drops below 2 ohms -as in replacing the mid and underseat woofers with Top HiFi (677) speakers for example. Top HiFi mid + tweeters speakers become 2ohms when connected together and the woofers are 4 ohms by themselves. When connected in parallel (not designed to be connected in parallel in the 677 or 676 systems) they will create a load to the iDrive of 1.33ohm.
The iDrive unit is not stable at 1.33ohm.
So before any speakers are replaced in the Stereo system you should take a look to what you are actually doing to the iDrive unit. The system will sound great at the beginning just because the lower the load the higher the power output. But that higher output comes with more heat inside the iDrive unit. More heat that was not intended by design to be there.
Your iDrive unit will overheat sooner or later, and then it will just fail.
Take care...  |
Is it mean not recommended to add speaker from 6 to 10 in standard sys? Thks