- whats the story? can passive line level crossover bi-amped systems work well for most fullrange + open baffle woofer systems? - assuming so, any examples and spreads that were needed? be nice to avoid extra circuitry and cost
pllxo
Freddi, I have been listening to a 2.5 way open baffle rig using a pllxo for the .5. The upper (two way) is a GPA 604. I had been using the gPA in a JE labs baffle, and decided I would rather try a taller narrow baffle for easier placement. I figured the bottom would fall off drastically, so I tried a series of experiments using a pair of 416's as the .5 way drivers including such things as simply running them in parallel with the 604 bass unit, using resistors to divide the load. I figured using a separate amp for the 416 would be a better route, so I built a test pllxo. I planned it using fairly low value resistances so I could run it at speaker line level and feed a pp 2a3 amp that needs a fairly low drive source to drive the 416's. The 604's are driven with a se el84 amp. I am using the stock GPA crossover on the 604s. The crossover point was determined first by figuring baffle step, (which would be around 350 hz), and then by listening to various configurations from 350 hz up to about 1200hz, settling on the final 750-800 point. The results have been very good.
Freddi, I have been listening to a 2.5 way open baffle rig using a pllxo for the .5. The upper (two way) is a GPA 604. I had been using the gPA in a JE labs baffle, and decided I would rather try a taller narrow baffle for easier placement. I figured the bottom would fall off drastically, so I tried a series of experiments using a pair of 416's as the .5 way drivers including such things as simply running them in parallel with the 604 bass unit, using resistors to divide the load. I figured using a separate amp for the 416 would be a better route, so I built a test pllxo. I planned it using fairly low value resistances so I could run it at speaker line level and feed a pp 2a3 amp that needs a fairly low drive source to drive the 416's. The 604's are driven with a se el84 amp. I am using the stock GPA crossover on the 604s. The crossover point was determined first by figuring baffle step, (which would be around 350 hz), and then by listening to various configurations from 350 hz up to about 1200hz, settling on the final 750-800 point. The results have been very good.
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