6h5g Posted February 21, 2009 Share Posted February 21, 2009 on the back of my combo it says 180 watts RMS 300 watts [u]peak[/u] - what does this mean? thanks. Quote Link to comment Share on other sites More sharing options...
Bill Fitzmaurice Posted February 21, 2009 Share Posted February 21, 2009 [quote name='6h5g' post='416320' date='Feb 21 2009, 02:16 PM']what does this mean?[/quote] That the manufacturer succumbed to the lure of advertising hocum. In a perfect world only RMS ratings would be allowed, but it being imperfect those on the advertising end love to use other 'ratings', such as peak, music power, peak music power and so forth, all in an effort to make the amp appear as powerful as they can. When comparing amps only RMS should be considered, everything else ignored. Quote Link to comment Share on other sites More sharing options...
6h5g Posted February 22, 2009 Author Share Posted February 22, 2009 yeah i thought it would be something like that thanks Quote Link to comment Share on other sites More sharing options...
Hamster Posted February 26, 2009 Share Posted February 26, 2009 To show how ridiculous manufacturers (or sellers) claims are have a look at this PA / DJ amplifier: [url="http://cgi.ebay.co.uk/1200W-POWER-NEW-DJ-PA-Amplifier-Nightline-Pro-400-black_W0QQitemZ300295065739QQcmdZViewItemQQptZUK_ConElec_SpeakersPASystems_RL?hash=item300295065739&_trksid=p3286.c0.m14&_trkparms=72%3A1701|66%3A2|65%3A12|39%3A1|240%3A1318"]http://cgi.ebay.co.uk/1200W-POWER-NEW-DJ-P...%3A1|240%3A1318[/url] PMPO-Power: 2 x 600 Watt and Music-Power: 2 x 200 Watt If you download the .pdf data sheet and zoom into the back panel you'll see it has a 1.5 amp fuse rating. Now my math is a bit crusty but assuming it's not an uber-efficient class D amplifier we're looking at around 55% efficiency, therefore: watts = current x voltage - 1.5A x 240 = 360 x 55% = 198watts. So, all of a sudden this 1200 watt PMPO amp can only produce 100 watts per channel - or am I missing something? Quote Link to comment Share on other sites More sharing options...
Adrenochrome Posted February 26, 2009 Share Posted February 26, 2009 [quote name='Hamster' post='419771' date='Feb 26 2009, 01:23 AM']To show how ridiculous manufacturers (or sellers) claims are have a look at this PA / DJ amplifier: [url="http://cgi.ebay.co.uk/1200W-POWER-NEW-DJ-PA-Amplifier-Nightline-Pro-400-black_W0QQitemZ300295065739QQcmdZViewItemQQptZUK_ConElec_SpeakersPASystems_RL?hash=item300295065739&_trksid=p3286.c0.m14&_trkparms=72%3A1701|66%3A2|65%3A12|39%3A1|240%3A1318"]http://cgi.ebay.co.uk/1200W-POWER-NEW-DJ-P...%3A1|240%3A1318[/url] PMPO-Power: 2 x 600 Watt and Music-Power: 2 x 200 Watt If you download the .pdf data sheet and zoom into the back panel you'll see it has a 1.5 amp fuse rating. Now my math is a bit crusty but assuming it's not an uber-efficient class D amplifier we're looking at around 55% efficiency, therefore: watts = current x voltage - 1.5A x 240 = 360 x 55% = 198watts. So, all of a sudden this 1200 watt PMPO amp can only produce 100 watts per channel - or am I missing something?[/quote] I think it's slightly more complicated than that. I remember being told that bass amps store up some charge in the capacitors (?) so there's a bit more juice there for the occasional accented note or whatever, hence the higher peak ratings. I may be wrong though! Quote Link to comment Share on other sites More sharing options...
Lfalex v1.1 Posted February 27, 2009 Share Posted February 27, 2009 [quote name='Hamster' post='419771' date='Feb 26 2009, 01:23 AM']To show how ridiculous manufacturers (or sellers) claims are have a look at this PA / DJ amplifier: [url="http://cgi.ebay.co.uk/1200W-POWER-NEW-DJ-PA-Amplifier-Nightline-Pro-400-black_W0QQitemZ300295065739QQcmdZViewItemQQptZUK_ConElec_SpeakersPASystems_RL?hash=item300295065739&_trksid=p3286.c0.m14&_trkparms=72%3A1701|66%3A2|65%3A12|39%3A1|240%3A1318"]http://cgi.ebay.co.uk/1200W-POWER-NEW-DJ-P...%3A1|240%3A1318[/url] PMPO-Power: 2 x 600 Watt and Music-Power: 2 x 200 Watt If you download the .pdf data sheet and zoom into the back panel you'll see it has a 1.5 amp fuse rating. Now my math is a bit crusty but assuming it's not an uber-efficient class D amplifier we're looking at around 55% efficiency, therefore: watts = current x voltage - 1.5A x 240 = 360 x 55% = 198watts. So, all of a sudden this 1200 watt PMPO amp can only produce 100 watts per channel - or am I missing something?[/quote] Nope. it's just a piece of creative [s]marketing[/s] [i]mathematics[/i] Quote Link to comment Share on other sites More sharing options...
6h5g Posted February 27, 2009 Author Share Posted February 27, 2009 haha interesting Quote Link to comment Share on other sites More sharing options...
bremen Posted February 27, 2009 Share Posted February 27, 2009 [quote name='Adrenochrome' post='419805' date='Feb 26 2009, 08:13 AM']I think it's slightly more complicated than that. I remember being told that bass amps store up some charge in the capacitors (?) so there's a bit more juice there for the occasional accented note or whatever, hence the higher peak ratings. I may be wrong though![/quote] That's correct. But Bill's right too, in that RMS ratings are far more descriptive. Quote Link to comment Share on other sites More sharing options...
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