Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

"Phantom Powered" 48v Class D Powered Speaker
"Phantom Powered" 48v Class D Powered Speaker
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 4th July 2016, 02:39 PM   #1
JayShoe is offline JayShoe  United States
diyAudio Member
Join Date: Oct 2011
"Phantom Powered" 48v Class D Powered Speaker
Default "Phantom Powered" 48v Class D Powered Speaker

Hello Diy'ers,

I have a project that is underway which includes balanced XLR outputs (L and R) that will normally be connected to active professional speakers. These active speakers will be powered by 120v AC (normal pro powered speaker).

Sometimes, a smaller speaker is desired. Something small and low output (5watt to 10watt). I'm trying to come up with a way to incorporate the possibility to run these smaller speakers from this project in the simplest way possible. My project already has XLR out, so why not Phantom Power!?

I know, this is NOT what phantom power was designed for. It's meant to power certain microphones. Would it work though?

- would it be possible theoretically to capture the phantom power from an XLR cable and step it down to 5v DC used to power a typical low-power class D amplifier ic?
- would the normal active powered speaker get "blown up" if this unique Phantom Power module is turned on when it gets plugged in? I know microphones essentially ignore the added phantom power when it doesn't need it, would this apply to a typical balanced line receiver too???

The point is that this concept would make it possible to connect a low powered speaker to my project with the exact same jack and cable requirements. It would allow for the connection of either a pro powered or a custom low powered speaker. Any advice is appreciated! Thank you.


Last edited by JayShoe; 4th July 2016 at 02:46 PM.
  Reply With Quote
Old 4th July 2016, 03:22 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
diyAudio Member
JonSnell Electronic's Avatar
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
The current from a phantom powered desk is milliamps so not useable for watts of power. It is current limited to about 10mA.
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 4th July 2016, 09:25 PM   #3
Pafi is offline Pafi  Hungary
diyAudio Member
Join Date: May 2004
Location: Budapest
Yes, phantom power is very low. But maybe not that low which made it unusable. Average power of 0.5 W can be enough for reasonable usage, about 5-10 W peak, if an energy storage element is used, I mean a big capacitor. The main challenge is to keep idle loss very low...

Supply voltage of 5 V is too low, use 12 V at least! Actually with single ended amplifier and 8 ohm load you need more than 16 V for 4 W of music power.
  Reply With Quote


"Phantom Powered" 48v Class D Powered SpeakerHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Budget Class A, Full Range 3.5"+Powered Sub Metronome Concept ByronRussell Full Range 7 12th February 2015 11:33 PM
Infinity Basslink 10" Powered Subwoofer Class D AMP problems LeonMR Class D 0 23rd September 2014 02:41 PM
Current limiting "bulb" tester for battery powered preamp Hikari1 Construction Tips 6 13th August 2014 08:40 PM
Frugal Mono Full-range, Solar-Charging, Battery-Powered "Ashiko" Speaker xpheolix Construction Tips 2 13th June 2012 03:51 PM
Anyone use this KRK Systems - RokitG2 6" 2-Way Powered Speaker msj965 Multi-Way 3 12th September 2010 05:05 PM

New To Site? Need Help?

All times are GMT. The time now is 05:20 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio