What am i doing? Connecting Iphone 4 to home stero system?

I've recently acquired a pair of old speakers off ebay. I've hooked them up to a Cambrdge A100 Amplifier.

I've connected the Iphone 4 to the amplifier through a Digitial to Analogue Audio converter through an Aux to Coaxal cable.

This then connects to the amplifier through standard RCA cables.

I unfortunately don't get any sound coming through the speakers, other than a bit of feedback and crackling when the volume nob is twisted.

The speakers work fine when connected to an AA battery for testing, the amplifier i'm sure works, as does the iphone.

What am i doing wrong? I'm completely new to this set up so any advice would be good!

Cheers

Added (1). EDIT: So the DAC has gone but still nothing coming through… What's the best way to test the system?

That's because your Iphone 4 is a museum piece.

I can't do it for you from mobile but move this question to the home electronics category. They will have the answer.

You don't need a digital to analog converter. The signal from the audio output jack on your phone is analog stereo output. Get a 3.5mm mini stereo to RCA patch cord, and plug the phone into AUX on the amp.

Connect the phone directly to the amplifier without the D/A converter.

Update: Find someone who can help you in person.

Sounds like the speakers are not powered adequately.

Earphone socket is already set so a DAP is a waste. You need a line out as that has no AMP on it.

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