the italian problem... |
Post Reply | Page 123> |
Author | |
_Natty_
Young Croc Joined: 01 April 2007 Status: Offline Points: 663 |
Post Options
Thanks(0)
Posted: 29 September 2010 at 2:47pm |
I don't know if it's the same in uk, but here many many venue have some serius prob on power supply, maybe just 1 32A plug -when u are lucky- maybe just 16A plugs...
-i've just broke an ab class amp this friday for driving it with too less power- so the problem how we can drive a big system with old amps like crest 9001 or crown MA5000 or similar... the only solution is going on expensive D class amp? any opinion is wellcome! |
|
Peter Papp [PKN]
Registered User Joined: 17 June 2010 Location: Budapest Status: Offline Points: 203 |
Post Options
Thanks(0)
|
Using more efficient amp means more output power from the same line. Probably good old linear amps are the less power efficient from any known technology. Most of the conventional low frequency and switching power supply powered amps(!) have very poor power factor and high line current distortion. If you have a modern and with good power factor (like amps with built-in APFC) you can pull out much higher power from the same socket safely. Some modern amps have pretty high stored energy inside which helps to deliver music peaks and "smoothen" the line current draw. Just for an example with the same 16A/230V (3600W) available power with 50% signal density (pretty high): 1. Linear amp Efficiency=60% PF=0,5 Real Input power:1800W Heat produced: 720W Output average: 1080W Output peak: 2x 1080W 2. Switching amp with PFC: Efficiency=90% PF=0,95 Real Input power: 3420W Heat produced: 342W Output average: 3078W Output peak: 2x 3078W So it is a pretty big difference. In the most number of cases the peak-to-average ratio with music signals rarely closes to 50% anyways. Edited by Peter Papp [PKN] - 29 September 2010 at 3:18pm |
|
king david
Young Croc Joined: 17 January 2007 Location: italy Status: Offline Points: 1324 |
Post Options
Thanks(0)
|
+1 on natty question
would soon go from 1 stack(4scoops) to 2 stacks(6 scoops) and would love to have the best amps with the limited power we usually find at venues what are the most efficient amps out there? infinite 8? |
|
http://www.warriorcharge.noblogs.org
|
|
bitzo
Registered User Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
Post Options
Thanks(0)
|
define "best" please. You know a class H, double toroidal sound lush but...eat a lot of current. A part class D, someone have experience with others switching amp?
|
|
_Natty_
Young Croc Joined: 01 April 2007 Status: Offline Points: 663 |
Post Options
Thanks(0)
|
so it's just an italian problem....
|
|
Speaker Sol
Young Croc Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
Post Options
Thanks(0)
|
Try Ireland.
Most of the time, we only get a pair of 13amp sockets running from the same ring main. Line voltage drops to around 218 and I have seen it as low as 210. I'm usly running PKN6000/4000/2500 and crown Macro Tech 9000i, All class D. The PKNs have no problem running at these low line voltages, the Crown however is very sensitive to line voltage drop.
|
|
bitzo
Registered User Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
Post Options
Thanks(0)
|
that's interesting, what kind of power supply have the pkn?
|
|
subbass
Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683 |
Post Options
Thanks(0)
|
at least you havent got a 250v+ .. got that in my house, causes no end of problems
|
|
audiomik
Old Croc Joined: 06 April 2010 Location: Bath, UK Status: Offline Points: 2962 |
Post Options
Thanks(0)
|
Re: "at least you havent got a 250v+"
heard somewhere that parts of Brizzle still has DC Supplies..... now I know it may be true! Mik |
|
Warning! May contain Nuts
plus springs, washers, screws, etc, etc. |
|
Speaker Sol
Young Croc Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
Post Options
Thanks(0)
|
Both the Crown and the PKN have switching supply's.
The PKN supply seems very well built, it manages to maintain a very high output regardless of the line voltage. As Line level drops the power supply does start to eat into it's thermal head room, However I regular a hot and sweaty club where I use the PKN XE6000, the line level sits around 218V, I power a pair of Void Stasys X Neo bass speakers, The DJs play Dub Step. Even under these conditions the amp is able to run the subs at optimal level without overheating it's self. The Crown on the over hand seems to run into clipping as soon as voltage drops. I think this is a software thing rather than a power supply thing, I think the amp is clamping down on the current when it sees the voltage dropping, which leads to premature clipping. This is probably a great feature in certain circumstance, however it leads to a lot of problems when your gigging old venues. I am happy, but it is worth noting at this point that I do have a vested interest in PKN. |
|
bitzo
Registered User Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
Post Options
Thanks(0)
|
so interesting and useful...so what about qsc pl series and lab gruppen?
Edited by bitzo - 01 October 2010 at 5:31pm |
|
abbotsmike
Registered User Joined: 28 December 2009 Location: Hillingdon, UK Status: Offline Points: 343 |
Post Options
Thanks(0)
|
If you read around you will find power supply problems are pretty universal, and many guys end up running off nothing more than a couple of ropey 13amp sockets.
|
|
Post Reply | Page 123> |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |