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Rajacat,I just picked up a Behringer DEQ2496 and mike in the hopes of tweaking the room response, but primarily to replace the baffle step and zobel circuit (in the digital realm when I get a DAC). As you say, it has bugged me that my chip (not digital BTW) based monoblocks don't quite have a direct connection to the single drivers with the baffle step/zobel circuit in the path. I probably won't get to it for a while as work is a bit hectic, we're in the middle of some landscaping work, and I'm running Dad one or two days a week to doctor's appointments. Plus I need balanced to RCA adapters and to study how to use this thing.
JLM, I'm not really sure if my Omega Hemp Dipoles need baffle step correction. If I want to experiment I might try the Inguz plug-in for the SB and do the correction in the digital realm therefore eliminating one more device and interconnects. I've been rolling gear recently and now I have biamped the Omegas with some stock Trends 10.1 and they sound great and I'm sure that my planned mods to the Trends will yield further improvements. I'm expecting delivery of a new battery supply soon which will eliminate most of the extraneous noise and smooth the SQ. BTW the detail I'm hearing from this setup is awesome.--Raj
Raj,I went to the Omega website but couldn't find any dipole speakers.If you meant Bi-pole, and a lot of people use the two terms interchangeably, then the answer is that you don't need to utilize a BSC circuit.Best Regards,TerryO
Quote from: TerryO on 25 Sep 2007, 12:26 amRaj,I went to the Omega website but couldn't find any dipole speakers.If you meant Bi-pole, and a lot of people use the two terms interchangeably, then the answer is that you don't need to utilize a BSC circuit.Best Regards,TerryOHe means dipole, the front and rear drivers have separate binding posts so they can be used in phase or out of phase. I believe many prefer them dipole.Lin
The problem you get with a bipole is this: There will be a frequency at which the wrap-around energy from the rear-facing driver will arrive at the listening position exactly 1/2 wavelength later than the energy from the front-facing driver. At that frequency, a cancellation notch will occur. Actually this is an oversimplification; the wrap-around effect is sort of smeared out across a frequency range because the wrap-around path length isn't the same for each path that the sound waves take around the cabinet. So in practice the actual effect is a fairly broad dip instead of a narrow notch.
Quote from: opnly bafld on 25 Sep 2007, 12:39 amQuote from: TerryO on 25 Sep 2007, 12:26 amRaj,I went to the Omega website but couldn't find any dipole speakers.If you meant Bi-pole, and a lot of people use the two terms interchangeably, then the answer is that you don't need to utilize a BSC circuit.Best Regards,TerryOHe means dipole, the front and rear drivers have separate binding posts so they can be used in phase or out of phase. I believe many prefer them dipole.LinLin, As soon as I read your post I remembered that Louis had provided for that option in some of his designs in the past. Dipole is an entirely different animal that has it's own set of positive (and negative)attributes. A classic dipole depends on the null created at the side of the baffle to cancel most of the energy that would otherwise be generated at 90 degrees from the surface of the baffle. This allows a great deal of attenuation in room reflection from the side walls with the confusing arrival time/phase inconsistencies. To overcome this, one would either need to reduce the frequencies above the bafflestep frequencies or to equalize (boost) the lower frequencies. With 4.5 inch drivers this isn't an enviable position to be in, as the difference in levels tend to be extreme. I would be very careful in going about this as it will be very easy to exceed the limits of the driver. I would strongly suggest contacting Louis about this before going ahead. If a subwoofer with a decent upper frequency reach is available then that may work, but in any case I would be very cautious.Best Regards,TerryO
Why not design the cabinet to boost the lower frequencies to compensate for the baffle step attenuation? BTW if you read closely Louis states the various hookup options for the Bi/dipoles. ZLS has an exclusively dipole version of the Bi/dipole that Louis built custom for him using larger boxes, I believe about the size of two Super 3 XRS boxes back-to-back. Also the new 4-1/2" hemp driver has a large excursion that enables it to go a lot lower than the Fostex 127 it replaced. Hemp fibers are very strong so maybe there can be new vistas in small driver design to explore. - Raj
And about BSC.....who cares?