[OZAPRS] DC connectors

Shaun vk2xpp at optusnet.com.au
Fri Apr 18 09:27:46 EST 2014

Off topic?

My sub woofer is tracked by APRS Mic-E.  If you are in Sydney and can 
access the Terrey Hills Repeater, (Manly Wahringah Radio Society 
146.875) it has Mic-E capability.


This guy is pretty insane if you are into subwoofers: 

Yes, the DC clipping kills voice coils quite quickly, although to the 
contrary I have lightly toasted a pair of DSE voice coils rated at 15 
watts, probably peak, with a 90 watt RMS amp.

  Happy Easter!

On 18/04/2014 9:15 AM, Ray Wells wrote:
> Ah yes! The magic smoke accompanied by the sinking feeling it causes 
> as one sees dollar signs etched on the eyeballs.
> This is way OT but you're more likely to see the magic smoke from 
> driving high power speakers with a low power amp than lower power 
> speakers and a high power amp because the former is more likely to 
> flat-top and put DC on the speakers.
> In my case the magic smoke came courtesy of 35V appearing across the 
> speaker when the amp module failed.
> Ray vk2tv
> On 18/04/14 09:00, Shaun wrote:
>> I had an earlier home brewed model that went to DC when I failed at 
>> an attempt to bridge 4 channels of an amplifier together.  Then the 
>> smoke came out of the speakers.  :-(
>> From memory this one is probably 33hz for -3db and 20 something hz 
>> for -10db.
>> Unlike true Doof Doof boxed, mine is linear in its response, so no 
>> nasty booming, just lots off bass!
>> Shaun
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