XTS 2500 - Surveilance earpiece issue

[Eaton90]

Hi everyone!
I bought an earpiece with volume control (p.n.#BDN6666A) and an accessory adapter (p.n.#BDN6676D) for my XTS 2500. But all this stuff seems to work quite strange...
First, the accessory adapter has a small PTT button. If nothing is connected to the adapter this button only enables...display backlight! However, if the earpiece is attached, the button works as a PTT just as it is supposed to.
Second - I have a genuine Motorola remote speaker mic and it has a built-in 3.5mm earpiece jack in the connector. I pluged Iphone earphones in it and they worked fine, but only LH earphone played audio (it's normal since the 2-way radio isn't a stereo audio system and it's allright with me). But when i tried to connect the cellphone earphones to the BDN6676D adapter, my radio began to transmit all the time untill the earphones were disconnected from the adapter. What's the matter? I suppose there's something about the earphones' rsistance...
And when I finally connected the genuine Motorola earpiece to the genuine Motorola accessory connector I was shocked - the volume of the earpiece was so low that even in a quiet room at home I had to turn the radio volume knob almost all the way to the max. position...not to mention the busy street The earpiece volume control is turned all the way to the maximum, too. That's ridiculous!
I'm very disappointed in my pricey purchase... Do you have any suggestions?

 

[IAmSixNine]

The problem with the iphone headset not working is related to the TRS connector. Tip, Ring, Sleve. Or TRS connector - Wikipedia, the free encyclopedia for more info. Its the WIKI page for such things.
Basically you have a grounded connector with 1 connector for left and 1 for right.
The adapter is looking for only 1 audio out source and 1 audio in source, the mic. Its also looking for a grounding source for the PTT switch. Yup i know horrible expllination, but basially your headset is not designed to work with the pin out of the set up you have. Hold up the RX only earpiece to the iphone plug and you will see what i am talking about. But better yet, check out the link and that will expalin it all as i have done a terrible job trying to explain. Sorry. LOL

 

[cmdrwill]

Any resistance on the headphone/earphone pin will key the radio's transmitter.

Also the three conductor plug is different, it is threaded to fit the adapter.

Some have used an adapter that has the correct threaded male, and a standard stereo jack with
a isolating capacitor in the audio path... Listen only.

 

[gary123]

I have bought several earpiece units (for the MTSX series radios) from ebay they all work very well and the price is exellent. I wont say from who but there are lots offering the devices.