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Buying advice - headphone socket

 
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jpkeates
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PostPosted: Wed Nov 25, 2009 11:09 pm    Post subject: Buying advice - headphone socket Reply with quote

I plan to use a TomTom on a number of vehicles, including a motorcycle.

Do any of the current TomTom One IQ range have a normal headphone jack?

If not, which of the cheaper end of the range do.

I've tried the iPhone app, and it's unusable without the cradle, and the cradle is no use on a bike - as it diverts the sound from the headphone socket.

Apologies if this is in the wrong place, I searched for similar questions but didn't see anything.
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mikealder
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PostPosted: Thu Nov 26, 2009 12:09 am    Post subject: Reply with quote

For a line out socket you need to be looking at the Go-x20 or x30 range, some of the refurbished x20 devices can be found on the internet for far less than the price of the XL IQ and once updated to the very latest application and map they will also have IQ Routes as well as a whole host of other features available should you want to employ them - Mike
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Darren
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PostPosted: Thu Nov 26, 2009 8:51 am    Post subject: Reply with quote

Line-out isn't the same as a headphone jack though is it?
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Andy_P
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PostPosted: Thu Nov 26, 2009 12:14 pm    Post subject: Reply with quote

Technically, no.
But the line out on a 720 is actually plenty loud enough (in my living room at any rate) on a pair of ordinary walkman-type headphones.

In fact it is too loud, and with recent software changes, there is stupidly NO VOLUME ADJUSTMENT possible from the TomTom. The volume slider is unmoveable and you get a fatuous message on-screen saying to use the car radio to adjust the volume.
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Darren
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PostPosted: Thu Nov 26, 2009 12:40 pm    Post subject: Reply with quote

Thanks Andy, as this is your field, what is the difference between the two? I always thought line out was louder and not suitable for headphones?
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EricWB
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PostPosted: Thu Nov 26, 2009 1:38 pm    Post subject: Reply with quote

CPC Farnell are still listing TT GO 520 as in stock brand new, so with LMG at £124.95 including vat. Mine seems OK and just managed to squeeze the new map into the LMG 30 days earlier this week
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Snudge
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PostPosted: Thu Nov 26, 2009 2:35 pm    Post subject: Reply with quote

It is possible to fit a headphone jack to the One and there is a thread HERE
I use my OneXL on the bike and the headphone works well.
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Andy_P
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PostPosted: Thu Nov 26, 2009 2:37 pm    Post subject: Reply with quote

Darren wrote:
Thanks Andy, as this is your field, what is the difference between the two? I always thought line out was louder and not suitable for headphones?


Line out is intended to be put into something else which further amplifies it, such as a car head unit or hi-fi system. It provides voltage but not much current, hence not a lot of power.

Headphone out would normally have a power amplifier behind it, so it can drive bigger loads where physical work needs to be done moving the magnets around (low impedance headphones, loudspeakers etc. at around 8 ohms).

It's an inexact science, as it depends on the exact circuitry they use, but in general, expect higher battery usage and possibly distortion if you try to make things go too loud using a line-out for headphones.

But a lot of earphones/headphones these days are a higher impedance (around 20 ohms or more), so they can work quite well on an un-amplified feed.
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Darren
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PostPosted: Thu Nov 26, 2009 2:45 pm    Post subject: Reply with quote

Thanks, had it back to front but understand now.
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