Very nice work. Is the variable part a variable resistor or something more complex?
My understanding is that a BSC is easiest approximated using a parallel combination of a resistor and inductor which is in series with the driver.
Increasing the resistor increases the ammount of BSC loss and the inductor controls the tunover frequency.
Hi navin,
You are right about BSC network.
I only use a variable resistor and a coil. In this case I add a cap (1,8 uF) in parallel with BSC to increase high frequencies level.
So I can adjust midrange according room, amp or music.
Phil.
You are right about BSC network.
I only use a variable resistor and a coil. In this case I add a cap (1,8 uF) in parallel with BSC to increase high frequencies level.
So I can adjust midrange according room, amp or music.
Phil.
Would you put up a the schematic with values of your BSC. I have used BSCs with my Fostex speakers.
Hi,
Schematic and calculate :
Loudspeaker Diffraction Loss and Baffle Step Compensation Circuits
In my case I have 2 mH and near 6,8 Ohms..
What is your design and drivers ?
Phil.
Schematic and calculate :
Loudspeaker Diffraction Loss and Baffle Step Compensation Circuits
In my case I have 2 mH and near 6,8 Ohms..
What is your design and drivers ?
Phil.
Have a look at my little experience with FE207E in MLTL (sorry in french) :
BSC ou correction de taille
BSC ou correction de taille
I'll assume you put the cap across the inductor and the best cap for you was 2.2uf?
Here's my trapezoid boxes for the FE-126en drivers ( Blue boxes) and the FF-125wk drivers in the (Black boxes). This box design is still a work in progress after a year and will be in-till I get it right 😕. Jeff
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probably not the only task performed for that reason
and count yourself lucky if those are the same ones we might imagine 😉, but some of us can't quite (remember how to) achieve
For explanation of the ideas of John Carlson!
KDL-Pilot/
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very interesting. what it this?
Karlson Dipol loudspeaker Pilot-I
Speaker from Kiev, Ukraine - Karlson Dipol loudspeaker Pilot-I.
One speaker, collected three acoustic design: dipole, tapering horn and K-Coupler from J. Carlson.
basic parameters:
Floor-type, passive, like dipolar
characteristics
Number of pages - 3
Sensitivity - 92 dB
Impedance 4 ohms
Frequency response - 37-25000 Hz
Type of crossover - the first order.
emitters
Speaker type Dynamic
RF transmitter front dome (aluminum)
Mid-radiator 130 mm (polypropylene)
Bass radiator 200 mm - 2 pcs. (paper)
additionally
Dimensions (WxHxD) 270x1400x270 mm.
Materіal - furniture board (beech).
Weight 25 kg.
🙂
Speaker from Kiev, Ukraine - Karlson Dipol loudspeaker Pilot-I.
One speaker, collected three acoustic design: dipole, tapering horn and K-Coupler from J. Carlson.
basic parameters:
Floor-type, passive, like dipolar
characteristics
Number of pages - 3
Sensitivity - 92 dB
Impedance 4 ohms
Frequency response - 37-25000 Hz
Type of crossover - the first order.
emitters
Speaker type Dynamic
RF transmitter front dome (aluminum)
Mid-radiator 130 mm (polypropylene)
Bass radiator 200 mm - 2 pcs. (paper)
additionally
Dimensions (WxHxD) 270x1400x270 mm.
Materіal - furniture board (beech).
Weight 25 kg.
🙂
These are the very same speakers Dave😀
A few details:
Planet10 EmKen - Only 3 pairs made (so far?), each pair being unique.
Size: 40 inches tall.... the rest you can guess.
P10 'Fonken' enclosure made from 18mm WBP ply with removable back and adjustable resistive vent length, currently set at maximum, damping is currently a mixture of thick upholsterers felt and...... no less than 7 oldish towels.
Mid to High 90's efficiancy.
Frequency response: They go as high as the 12Lta can and I dont know how low, but low enough to get the job done.
Drive unit: Eminence Beta 12 Lta - Caulk damped magnet/basket, felt on inside of basket legs, basket grounding, dust cap removed, custom phase plugs and pluffed whizzers----12Lta's need A LOT of run in time, mine had near 100hrs in free air and a few thrashings in cabinet (parties - every time they return home they sound better and Hotblack Desiato was made proud 😀), day in day out music playing / being gamed through and till they are run in, I am postponing EnAble.
For me, the single wide range driver per channel concept works, the losses are totally out weighed by the gains. Some times there is a feeling of a lack of solidity in the lower end of the cabinets tuning and I am looking into a remedy for this.......... no doubt (read 'I hope') it / they will be large and equally as scary
Thanks to Dave / P10, JKRO (phase plug sorter outer), Matt the carpenter and a numpty who managed to put himself out of busyness unaided.
can't really tell much about this design from the photo. are there plans? didn't find any on the Web.