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NITZ V1505 wrote: Could it be the amps in question can deliver their stated outputs at 1khz but on very low frequencies fail to impress. Especially when playing Roots/Dub music where the bass notes require the amp to be able take sustained punishment all night without breaking a sweat.
luton_soundman wrote: Yes Lev, that's why i brought the inf8 down for reference, alot of people thought that was a bad idea days before the event. smiley1
it baffles me how manufacturers get their ratings? dont get me wrong they sound good but do not understand the power ratings? to me a ca18 with almost half the power rating would give most of them a run for their money on power. luckily for us we had the test to see what was really going on, Leon almost bought a pkn aswell for sub a while back....thinking he was getting 3k a side @ 4r.... heard stories of roots man using them and the amps early into a session start reducing power to cool down because they cant take it, yet the amp should have heaps of headroom and be running comfortable according to the specs?
Daz wrote: I also wonder how mutch the instantainious current driving ability of SMPS units is effected by the size of the resovior capacitors used.
Conventional power supplies use massive caps usualy 10000uF+ for each cap. Wheras SMPS units tend to use smaller caps that are in theory maintained by recharging far more often (100Hz for conventional and usualy several thousand Hz for SMPS) The smaller caps are less capable of supplying high peak/surge currents. This would seem to suggest that the peak current driving ability of a SMPS unit is far more dependent on the supply as opposed to the resovior. Perhaps this could be why the SMPS units tend to hit a brick wall where there just isnt anything left in reserve.
I am assuming that you cant realy use the larger caps because the frequencey that the SMPS is operating at would not allow enough charging time between cycles (Or would require excesive Mark-space-duty cycle time to do so with PWM) and would result in the caps running undrcharged most of the time?
Tony.A.S.S. wrote: Perhaps it's time for re-appraisal. This time I'd like to see what goes on. I'd certainly bring my amp in for comparison, baring in mind, none of this is competition. I'd like to know where we stand with various types of amp. I'm always tempted to go for the best.
levyte357 wrote: Plain and simple, 99% of the specs for lightweight amps are pure lies..
no, just not tested on roots music program smiley36