I'm pretty sure one of the 'pins' within every USB port is a 5V powered pin. As it stands now, the OP has had the speakers working in OS X, just not Windows 7.

Dec 09, 2007  All replies. Each USB port on your computer provides 0.5 amps (500 ma). If you have a 4 port hub each port on the hub can only draw.125 amps, which isn't enough to charge the phone or even power it during a sync. This isn't Apple's fault; Physics Rules. If your hub has its own power supply and is designed correctly IT provides. Sabrent USB Type C to 4-Port USB 3.0 Hub with Individual Power Switches and LEDs. Turn one USB-C port into four USB 3.0 ports with the hub designed to work with the latest generation of USB-C equipped computers and smart devices.

It may not be enough power for the speakers to work effectively, but ALL USB ports do indeed transmit some power. EDIT: Indeed.I found this on: 'The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire from which connected USB devices may draw power.'

That being said, since the keyboard has no other source of power.i.e. It is essentially a non-powered hub, both ports must share the 5V and at that level it's doubtful you will have much success driving the speakers AND mouse AND keyboard with that small an amount of power.as Windows is pointing out. Your best solution would be to get a USB powered hub. You can connect both your speakers and your keyboard to it, and it should then work fine.

When we were defining the USB specification, we had significant debates on whether we should allow non-powered hubs. Or if we should require all hubs to be powered. Delivering the full 0.5A @5V (2.5W) to every port.

On the pro-side. The current spec allows low powered devices (such as your mouse) to be plugged into a keyboard. The obvious con is the reduction in ease-of-use in not knowing if an individual port is high or low powered. Very true flynz4. To be honest, it's crossed my mind often to get a powered hub, but I guess convenience gets the better of me every time. Still, either way it doesn't really solve the problem of Mac OS vs.

Before this keyboard, I used to use a USB 1 non-powered hub, and could have a keyboard, mouse, and two controllers (or a pen drive in place of one of those), all at the same time. Come to think of it, that worked fine on Windows too. I guess that makes the question specifically about how only the Apple keyboard works in either OS. Very true flynz4. To be honest, it's crossed my mind often to get a powered hub, but I guess convenience gets the better of me every time. Still, either way it doesn't really solve the problem of Mac OS vs. Before this keyboard, I used to use a USB 1 non-powered hub, and could have a keyboard, mouse, and two controllers (or a pen drive in place of one of those), all at the same time.

Come to think of it, that worked fine on Windows too. I guess that makes the question specifically about how only the Apple keyboard works in either OS. Click to expand.I believe you are not realizing that there are two things that occur: 1) The ability of a device to actually work (irrespective if it meets the spec) 2) The policies of a computer which enable a device (for example, if the spec is not met) One of the things that USB allows is for each device to report its capabilities and/or requirements.

It is quite possible the the combined power requirements of your unpowered hub, keyboard, and USB speakers exceed the amount of current (0.5A) available from the USB port on your computer. Yet still within the range where they might operate from a practical standpoint. It sounds to me like the Windows USB driver is determining that the combination of devices exceeds the specification, and hence is not enabling your speakers.

I have no idea if Apple has similar policies in its USB drivers.

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