By connected if you mean communicating then its seven but the practical limitation may be 1 or 0.What is the limit to how many Bluetooth devices can be connected to the SP3 at the same time?
I've used 4 devices at one time, keyboard, mouse, headset and smartcard reader all connected to Bluetooth.
What Router are you using for your home network?I wonder why I can only connect two? Could it be the WiFi connection as mentioned above? How do I determined if my what GHz my home WiFi is?