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Bergantino, Epifani, efficient ?

Discussion in 'Amps and Cabs [BG]' started by inazone, Dec 16, 2003.


  1. inazone

    inazone

    Apr 20, 2003
    Colorado
    I have berg cabs but dont understand the 2.8v/1m . SWR and others are 1w/1m . so in laymans terms where do cabs stack up as far as volume? Lets say in the 410 range and arround 800-1200 watts. Eden cabs are loud, acme cabs are quiet, where do berg, epifani, EA, swr, ebs, aguilar and others fall in line with all things being equell?
     
  2. kmacleish

    kmacleish

    Nov 19, 2003
    Atlanta, GA
    Ah, but all things are NEVER equal, are they?

    OK, starting with the basic and boring math:

    For some strange reason, Bergantino seems to rate their various cabs for efficiency using a 2.83 volt (presumably RMS, they don't say) signal. This translates to one watt into an 8 ohm cabinet, but is two watts into a 4 ohm cabinet. So what, you ask? Well, this makes the 4 ohm cabs look pretty good, because twice the input power gives them a 3 db advantage (3 db = doubling of power). Most manufacturers rate by measuring the speaker's output at a distance of 1 meter with 1 watt of input power, which rating is then independent of the speaker's impedance.

    So, IF you have the same efficiency rating method on cabinet A and cabinet B, and cabinet A gives 95 db at 1 watt/meter while cabinet B gives 101 db, then you need to be aware that cabinet B will play as loudly with a 50 watt amplifier as cabinet A will with a 200 watt amplifier (6 db better efficiency = TWO doublings).

    So, if you compare, say, the Epifani T210 with the Bergantino T210, you find that the Epifani is 2 db more efficient than the Bergantino, which is interesting but probably not a determining factor in which one to buy.

    A BIG generalization is that better drivers tend to use bigger and stronger magnets and larger voice coils, which add cost but also help efficiency and (usually) sound quality.

    Did this help? If not, clarify what you want to know and I'll try again.
     
  3. 2.83V corresponds to 1W into 8Ohms. this has been used very often in the speaker industry. and given that Jim Bergantino comes more from a home and PA audio background than from instrument amplification background, this makes sense.

    i don't think it matters which system you use as long as you're aware what it means.

    as for whether that 2.83V is RMS, is the 1W that SWR rates their cabs at RMS? it should be for both.

    robb.