Ouput difference of PA Amplifier and Power Amplifier

[wakanga]

mga sis gandang araw po....may project kasi akong PA/paging system..gusto ko lang malaman ang difference ng ouput ng PA amplifier sa Power amplifier kasi medyo confusing...sa PA amplifier kasi ang nakalagay sa output is COM,4-16ohms,70V,100V while sa power amplifier is impedance and power wattage....besides from the obvious difference ng dalawa bakit volts ang gamit na output reference sa PA amp while sa power amp is watts? yung speaker ba na ginagamit sa power amp pwede rin sa PA amp and vice versa? nakita ko kasi yung PA speaker meron pa siyang matching transformer...pardon for my ignorance pero ano difference nito sa regular speakers? salamat po

[a.out (drako65)]

70v, 100v distribution system, SIS
eto basa lang:
http://www.alectrosystems.com/audio/Distribution/70volt.htm

[a.out (drako65)]

eto pa isa:
http://www.ticcorp.com/25v_70v_100v_systems.htm

[wakanga]

thanks sis, anyway i have read the articles incase i would like to use power amplifier and standard speakers to do a distributed speaker system tapos mag-series-parallel ako para sa impedance matching pwede kaya? incase naman na pwede how would i add a variable attenuators/variable volume control on each speaker para ma-balance ko sound output/level? kasi as i understand mababago ang line resistance once nilagyan ko ng volume control, any ideas po para dito? i know about the 70-volts distributed system and madali ito gawin dun...focus po sana tayo sa power amplifier - standard speaker combo...thanks po

[a.out (drako65)]

powered speakers kaya? mga 30 watts bawat isa, may nakita ako, LD systems gamit
tapos audio distribution preamp na lang

[tony]

@wakanga,
please read this page: http://www.electronicslab.ph/forum/index.php?topic=26185.0

[THXneo]

thanks sis, anyway i have read the articles incase i would like to use power amplifier and standard speakers to do a distributed speaker system tapos mag-series-parallel ako para sa impedance matching pwede kaya? incase naman na pwede how would i add a variable attenuators/variable volume control on each speaker para ma-balance ko sound output/level? kasi as i understand mababago ang line resistance once nilagyan ko ng volume control, any ideas po para dito? i know about the 70-volts distributed system and madali ito gawin dun...focus po sana tayo sa power amplifier - standard speaker combo...thanks po

mahirap ang impedance matching thru series parallel connection.ang output ng speaker ay di magiging parehas,meron malakas at meron mahina.ideal lang ito pag konti speaker mo.pero kung ang paggagamitan mo ay 10 speakers o pataas recommended ung 70.7 volt line.sa mga baranded na PA katulad ng TOA meron trafo ang output nito pra selectable sa direct drive o 70.7- 100 volt line.
pede gamitin ang matataas ng rating na power amp katulad ng 300w ng SMG.(wala na modification sa side na PA)bawat speaker ay may 1 matching transformer.selectable ang output depende sa wattage na kailangan mo.meron din attenuators na nabibili na pwede comontrol ng volume ng speakers o group ng speakers depende sa connection mo.pede rin gamitin sa zoning.