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[chrisgixer]

It is present on ipod, and iphone. Although iphone has a quieter volume level for some reason.

How is the gayPhone connecting to the HK, presumably not via the iPod connection, as you HK doesn't support Lightning.

Either 3.5 Jack aux in on Hk . Or bt reciever connected to same. Audio is the same with either, and yes the gay phone volume is on max.

[chrisgixer]

If its happening with the gayPod via the gayPod connection, I'd suggest you're in the realms of FM adapter deficiencies.

But its been in a couple of years now, possibly more? I vaguely recall doing it, and I must have been pretty mobile, so must have been pre accident (Feb 2012)

Possibly.

[Magwheels]

Sibilance perhaps?

Maybe the amp clipping?

[DrAndyB]

Ahh impedance 

Think right angle triangles.   . Horizontal is Resistance (real bit) vertical is complex bit (reactance) and long bit (overall Impedance).  So for DC systems only resistance is valid as frequency is zero for reactive bit is zero !  For AC systems there then exists this complex vertical reactive bit which is proportional to frequency ( for capacitive systems the higher the frequency the smaller reactance.  This is why ac signals can pass through a capacitor and DC is blocked.  For inductive systems its the opposite.  That is why power transformers are the size and impedance they are and why 50hz mains voltage works so well.  Any higher frequency and the tranformers "reactance" increases as the vertical bit of that earlier triangle gets bigger so the bit triangle bit, the impedance, bets bigger.

PM me if you need to know more 

I have P.HD in electrical and electronic engineering, chartered Engineer and design the 132kV and 33kV power system for one of the main electricity network companies so know a bit about Complex impedance 

The Dr. 

[Kevin Wood]

I'm going to hazard a guess that your FM modulator is overmodulating and that this is where the distortion comes from. Could also be that it's slightly off frequency. Same result. For the price, it's hardly likely to a masterpiece of frequency stability.

I've noticed by 2006 actually distorts on most proper radio stations, TBH. Combination of poor modulator and / or poor tuner? Could be that the levels into the modulator are too high on the peaks, of course. Does it sound louder than a typical radio station at the same volume setting?

[chrisgixer]

Ooh now that's difficult to answer, as the modulator causes some loss of signal. There aren't many stations left

...but certainly the iPhone is quieter than everything else, for some reason?

[TheBoy]

It is present on ipod, and iphone. Although iphone has a quieter volume level for some reason.

How is the gayPhone connecting to the HK, presumably not via the iPod connection, as you HK doesn't support Lightning.

Either 3.5 Jack aux in on Hk . Or bt reciever connected to same. Audio is the same with either, and yes the gay phone volume is on max.

IME of gayDevices, that in itself can cause a bit of clipping.

Does the distortion reduce if you turn volume down on gayPhone and turn up on HU?

Is this a new thing, seeing as you've had the system several years, if so, whats changed? Is the HK a bit naff, where 2 devices in its 2 3.5mm (does it have 2 x 3.5mm jacks, or have to bodged something in  <<<  This is where impedence mismatches will occur, eg, you're plugging in phone by 3.5mm and BT via the same input)?

[Dave DND]

I was also about to suggest to turn the iPhone volume down to less than half and then turn up the volume on you other devices

Does this improve the quality - if so, you will have to find a happy volume setting where the iPhone can be turned up and the main device turned down - keep playing until you have found a good setting.

When this has been done, pat yourself on the back, as you now understand how impedance works

[chrisgixer]

The distortion, minimal as it is, has always been there. No change, and it's the same on all devices that input the hk. Might point to the hk being the cause...?

There is only one aux in via 3.5 jack. Other input is iPod cable only. The volume and distortion on the aux in is exactly the same if via iPhone bt receiver to hk aux in. Or without bt receiver. There is no audible change in using the bt reciever that I have noticed so far.

Will fuddle with volume settings on the way home

I presume there's no immediate fix or box of tricks that can be fitted in line and balance things out? I'm sure one of you guys would of mentioned it by now.


As I say though, it's no biggy, has been so since instalation, and has not got any worse. It's only the addition of the bt receiver that has upped my usage and prompted a few questions. In fact, the iPod i'm using make more noise  than the interference as it's an old 3rd gen with a herd disc that can actually be heard spinning up at the start of each track. but I know what the cause and cure is for that (buy a compatible solid state iPod) so not worried.

It was more a case of understanding the fault with this impedance business.

[zirk]

There is only one aux in via 3.5 jack.

I presume there's no immediate fix or box of tricks that can be fitted in line and balance things out? I'm sure one of you guys would of mentioned it by now.

Far from it,

[zirk]

There is only one aux in via 3.5 jack.

I presume there's no immediate fix or box of tricks that can be fitted in line and balance things out? I'm sure one of you guys would of mentioned it by now.

Probably also worth pointing out when playing with Mobiles, is the Jack input and outputs dont follow normal Headphone or Audio line level rules, the likes of Nokia, SE, Samsung etc, so dont suppose iPhone is any different, have there own Tip, Ring and Sleeve connections on the Jack or Socket, mostly in the form of Background Resistive Pads or Capacitor Loops in the cable or jack plug mould in order to tell the Phone what to do or what to expect when that cable is plugged in.

Example on Nokias, put a 100 ohm resistor pad on one of the Rings to Sleeve and the Mobile goes from sending out Headphone level at 20 Oms and switches to RCA Line Level at 1K, add another resistive pad somewhere and the Mic pin sends Video out on it, and other R pads or Cap Loops elsewhere and you can control Answer, Hang Up, Music Shuffle, etc all down the same plug.

So worth remembering when plugging in line jacks willy nilly, etc, whilst you may get some noise out of them, might not be the correct noise your after, especially when plugging the leads in to other devices with unknown input impedance.

[Marks DTM Calib]

Resistance is a basterdised version of Impedance for those who only understand DC systems.

In reality, impedance is actually what it sounds like, the electrical 'impedance' of an electrical path but in this case it considers the full frequency spectrum and not just DC.

And that's where it gets interesting as all items will have a different impedance at different frequencies......and when I say all that's everything from a basic piece of wire through to a transistor or speaker......

[TheBoy]

I presume there's no immediate fix or box of tricks that can be fitted in line and balance things out? I'm sure one of you guys would of mentioned it by now.

No, due to the nature of the problem. Unless somebody has made a specific iPhone 5 to HK matching device.

[05omegav6]

I presume there's no immediate fix or box of tricks that can be fitted in line and balance things out? I'm sure one of you guys would of mentioned it by now.

No, due to the nature of the problem. Unless somebody has made a specific iPhone 5 to HK matching device.

Which will presumably be different to the box required when the iphone 5 becomes an iphone 6

[TheBoy]

I presume there's no immediate fix or box of tricks that can be fitted in line and balance things out? I'm sure one of you guys would of mentioned it by now.

No, due to the nature of the problem. Unless somebody has made a specific iPhone 5 to HK matching device.

Which will presumably be different to the box required when the iphone 5 becomes an iphone 6

Who knows, the design may be simialr enough for it to be no issue.

Gixer - do you have an alternate MP3 player (not Apple) that you could fire in the HK 3.5mm, and report back?