Seeking some advice on powering up.....
I have a pair of powered spkrs + sub - each has an on/off switch on the back - as they are behind the desk it is difficult to get at the power switch on each spkr.
I'm wondering if it could cause them any damage if I leave the spkr on/off switches in the "on" position and power them up by switching power on at the power board?
I guess the question boils down to where the protection circuit in the speaker lies - would it be wired within the switch or after it?
thoughts? advices? anyone had a spkr go up in smoke doing this?
- It is currently Sun May 05, 2024 1:01 am • All times are UTC + 10 hours [ DST ]
Powering up speakers query
Moderators: rick, Mark Bassett
7 posts
• Page 1 of 1
Powering up speakers query
Ian Dare
- Drumstruck
- Valued Contributor
- Posts: 1589
- Joined: Fri Sep 17, 2010 12:37 pm
- Location: NSW South Coast
Re: Powering up speakers query
you'd need a soft start power up device to avoid surges of power going through the cone. if you have valuable speakers, i'd never want them exposed to power ons like that.
in DIY project amp builds, a soft start is connected to the power supply as a device to slowly feed power to the circuit...so i'd say its after the power switch and before the PSU. im not technical enough to explain it properly,but i know sudden power increases arent ever good for speakers.
in DIY project amp builds, a soft start is connected to the power supply as a device to slowly feed power to the circuit...so i'd say its after the power switch and before the PSU. im not technical enough to explain it properly,but i know sudden power increases arent ever good for speakers.
Jamil Khuri
Amusement & Audio Engineer
"it's not awesome unless its 240bpm with distorted 909 kicks!"
Amusement & Audio Engineer
"it's not awesome unless its 240bpm with distorted 909 kicks!"
- jkhuri44
- Forum Veteran
- Posts: 2537
- Joined: Wed Sep 20, 2006 10:53 pm
- Location: Dundas
Re: Powering up speakers query
"Usually" the power switch just applies the mains to the internal circuitry, so switching on at the wall socket would do the same thing, and if there is any 'soft start' circuitry inside the speaker amps, then it will still operate. It is highly unlikely that there is any protection circuits prior to the main switch.
There are exceptions, however, and the most common one is valve amps with solid state rectifiers, which have a 'standby switch'. This allows the heaters time to get hot before the high voltage is applied to the anodes. This is not commonly necessary in valve amps with valve rectifiers as the warm up time of the rectifier allows the heaters to get hot.
Without seeing the circuit for your specific speakers, my guess would be that powering them on at the switch would be fine, YMMV, NWGOI.
There are exceptions, however, and the most common one is valve amps with solid state rectifiers, which have a 'standby switch'. This allows the heaters time to get hot before the high voltage is applied to the anodes. This is not commonly necessary in valve amps with valve rectifiers as the warm up time of the rectifier allows the heaters to get hot.
Without seeing the circuit for your specific speakers, my guess would be that powering them on at the switch would be fine, YMMV, NWGOI.
Bob Charman - Stockport Sound, SA
The Road Goes On Forever and the Party Never Ends..........
The Road Goes On Forever and the Party Never Ends..........
-
stosostu - Regular Contributor
- Posts: 458
- Joined: Fri Jul 23, 2010 3:17 pm
- Location: Clare and Gilbert Valleys, South Australia
Re: Powering up speakers query
Thanks Bob - that was what I thought, but being a prudent architect I follow the rule of "test twice / implement once".
fyi they're KRK Rokit 3-way monitors and matching 12" sub
fyi they're KRK Rokit 3-way monitors and matching 12" sub
Ian Dare
- Drumstruck
- Valued Contributor
- Posts: 1589
- Joined: Fri Sep 17, 2010 12:37 pm
- Location: NSW South Coast
Re: Powering up speakers query
Try it! If they don't Thud! loudly then I'm sure they'll be fine. If they do Thud! loudly they'll probably still be fine but it can scare the shit out of you if you aren't expecting it!
Kurt Neist
Chief cook and bottle washer - Metalworx
Chief cook and bottle washer - Metalworx
-
Kurt - Valued Contributor
- Posts: 1235
- Joined: Sat May 07, 2005 1:02 am
- Location: Canberra
Re: Powering up speakers query
Well here is the answer if you own KRK 10-3s and a KRK-12-s (sub) ........ don't do it.
Test results (using a quality power board with protection circuit):
Test 1 - Sub power up via it's power switch = no thud
Test 2 - Sub power down via it's power switch = no thud
Test 3 - Sub power up via power board (with sub switch "on") = no thud
Test 4 - Sub power down via power board (with sub switch "on") = soft thud
Test 5 - 10-3s power up via their power switch = no thud
Test 6 - 2 10-3s power down via their power switches - no thud
Test 7 - 10-3s and 12-s power up via power board = no thud
Test 8 10-3s and 12-s power down via power board (wih spkr power switches "on") = medium thud
Damn!
Test results (using a quality power board with protection circuit):
Test 1 - Sub power up via it's power switch = no thud
Test 2 - Sub power down via it's power switch = no thud
Test 3 - Sub power up via power board (with sub switch "on") = no thud
Test 4 - Sub power down via power board (with sub switch "on") = soft thud
Test 5 - 10-3s power up via their power switch = no thud
Test 6 - 2 10-3s power down via their power switches - no thud
Test 7 - 10-3s and 12-s power up via power board = no thud
Test 8 10-3s and 12-s power down via power board (wih spkr power switches "on") = medium thud
Damn!
Ian Dare
- Drumstruck
- Valued Contributor
- Posts: 1589
- Joined: Fri Sep 17, 2010 12:37 pm
- Location: NSW South Coast
Re: Powering up speakers query
There must be some sort of suppressors across the internal power switch then. Unlikely to cause any damage, but annoying, so not recommended.
Bob Charman - Stockport Sound, SA
The Road Goes On Forever and the Party Never Ends..........
The Road Goes On Forever and the Party Never Ends..........
-
stosostu - Regular Contributor
- Posts: 458
- Joined: Fri Jul 23, 2010 3:17 pm
- Location: Clare and Gilbert Valleys, South Australia
7 posts
• Page 1 of 1
Return to You've gotta start somewhere.
Who is online
Users browsing this forum: No registered users and 2 guests