Members heath_eld Posted December 27, 2009 Members Share Posted December 27, 2009 I have a pair of Wharfedale EVP 15P active subs that i use with my "small rig" for ease of portability and load in and out. They are... usable i guess. Worth having but definitely at the bottom of the spectrum. However i have an issue. They have an external heat sink, which i find getting really hot. I mean, by the end of a band set (approx 45 mins), not quite enough to burn you but not far off it. Is this a problem? Am i risking failure (presumably of the amps etc) by continuing? Or is it normal. I am going to email wharfedale and check their opinion also. I don't believe it is a "fault" though because both subs do it. Link to comment Share on other sites More sharing options...
Members tlbonehead Posted December 27, 2009 Members Share Posted December 27, 2009 Are the clip lights coming on? If not, you should be ok I would think. You aren't setting them right against a wall or anything, are you? You want a little space for the heat to disippate. Link to comment Share on other sites More sharing options...
Members heath_eld Posted December 27, 2009 Author Members Share Posted December 27, 2009 Not against a wall. They are used in a variety of spaces but the best test i have given them, the most recent gig i did, was on a open stage. Not getting the clip lights on. At the last gig i did, i pushed them to see how far they would go before hitting the clip, and i did, but that was a one off. I would normally avoid clipping them to avoid damage. Link to comment Share on other sites More sharing options...
Members Mogwix Posted December 27, 2009 Members Share Posted December 27, 2009 Heatsinks get rid of heat, that's what they do. Unless you're slamming the things into limit I wouldn't worry about it, just leave the sinks some room to breathe and they'll be fine. be careful outdoors on hot/muggy days, though. Link to comment Share on other sites More sharing options...
Members tlbonehead Posted December 27, 2009 Members Share Posted December 27, 2009 .A fan is your friend then! Link to comment Share on other sites More sharing options...
Members Telecruiser Posted December 28, 2009 Members Share Posted December 28, 2009 A fan is your friend then! +1! Link to comment Share on other sites More sharing options...
Members dboomer Posted December 28, 2009 Members Share Posted December 28, 2009 Are the clip lights coming on? If not, you should be ok I would think. Although it may seem counter-intuitive ... if you clip lights were on all the time continuously there would be less heat. The least heat is produced when an amp is full on or full off. Link to comment Share on other sites More sharing options...
Members heath_eld Posted December 28, 2009 Author Members Share Posted December 28, 2009 "Although it may seem counter-intuitive ... if you clip lights were on all the time continuously there would be less heat. The least heat is produced when an amp is full on or full off." Really? Link to comment Share on other sites More sharing options...
Members dboomer Posted December 28, 2009 Members Share Posted December 28, 2009 Yes because it is sending all the power out so there is little left internally to be dissipated. When the amp delivers 1/3rd of the power out the remaining 2/3rds are left inside. Crazy world, huh? Link to comment Share on other sites More sharing options...
Members Gregidon Posted December 29, 2009 Members Share Posted December 29, 2009 Yes because it is sending all the power out so there is little left internally to be dissipated. When the amp delivers 1/3rd of the power out the remaining 2/3rds are left inside. Crazy world, huh? This is only true of linear amplifiers. Amps with Class-D output stages operate at roughtly the same efficiency throughtout their output range. Link to comment Share on other sites More sharing options...
Members dboomer Posted December 29, 2009 Members Share Posted December 29, 2009 This is only true of linear amplifiers. Amps with Class-D output stages operate at roughtly the same efficiency throughtout their output range. Yep! But his are class a/b Link to comment Share on other sites More sharing options...
Members Gregidon Posted December 29, 2009 Members Share Posted December 29, 2009 Yep! But his are class a/b just clarifying least someone of lesser experience see this thread and add it to their bank of universal knowledge Link to comment Share on other sites More sharing options...
Members agedhorse Posted December 29, 2009 Members Share Posted December 29, 2009 The 1/3 power rule of thumb only applies to class AB. Class G & H are different and depends on the number of rail tiers as well as the voltage spread. Link to comment Share on other sites More sharing options...
Members dboomer Posted December 29, 2009 Members Share Posted December 29, 2009 Yes ... you basically spread the same kind of thing across the tiers. I just though I'd point it out because it would seem that max power would produce max heating but it doesn't in conventional amps. OTOH ... power off still produces no heat in any class;) Link to comment Share on other sites More sharing options...
Members Gregidon Posted December 29, 2009 Members Share Posted December 29, 2009 Look, i'm not hard clipping because i like disorted bass, it's 'cause i want to be efficient... you see it's much more green that way Link to comment Share on other sites More sharing options...
Members agedhorse Posted December 30, 2009 Members Share Posted December 30, 2009 Ugh. Link to comment Share on other sites More sharing options...
Members kobe Posted December 30, 2009 Members Share Posted December 30, 2009 I have four wharfdale evp15 powered subs, the heatsink do get very hot and it concerns me too, after a short time the heatsinks get to hot to touch.They're ok for live band stuff and pop DJ's in small rooms, Unfortunatly even with 4 used together they're not very loud for hard DJ styles, but they are a comparatively cheap powered speaker so that make sense. Link to comment Share on other sites More sharing options...
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