Picked up a pair of Bozaks at Goodwill for $100. I beleive they are the 302-A with the barlizer walnut cabinets.
The xover seems odd to me. I think someone added the electrovoice horn to these but I am not sure. I drew up the xover and yes it is 100% correct. I am an engineer and know how to do such things. The lack of resistors and such seems odd to me. Can someone in the know more than myself take a look and advise as to what is here?
Thank you so much.
The xover seems odd to me. I think someone added the electrovoice horn to these but I am not sure. I drew up the xover and yes it is 100% correct. I am an engineer and know how to do such things. The lack of resistors and such seems odd to me. Can someone in the know more than myself take a look and advise as to what is here?
Thank you so much.
Yes, this crossover design is rather rare in these modern times. It is a form of distributed filter, where filtered frequency band from previous filter is handed over to the next filter, increasing roll-off slope toward low frequencies for each next filter. So, B209B has high-pass filter with 6dB/octave slope, B208Y have high-pass filter with steeper slope - somewhere between 6dB/octave and 12dB/octave (depends on C and Z values), and so on, each next filter will have steeper slope roll-off.
The lack of resistors means (ideally) that sensitivities of all drivers are matched. Tweeter has resistors in a form of T-pad.
The lack of resistors means (ideally) that sensitivities of all drivers are matched. Tweeter has resistors in a form of T-pad.
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Electro-Voice horns were not original to Bozak speakers. If someone added an EV horn (like a T35 or something similar), they likely bypassed or hacked the crossover.
Yes they have a nice pair of EV T-350 tweeter horns in them. They were worth the purchase price alone. When you turn the horns all the way down the speakers seem to be seriously lacking up top. They sound great once I replaced all the caps in them. They came with electrolytics back to back polarity-wise. I replaced them with the equivalent uf value with film caps. The back to back 8ufs became a 4uf film cap, BtB 15ufs became 8uf and the 50ufs became 22uf. Why did they use 2 caps back to back like that? Do they give better AC response that way vs having only 1 polarized cap? They are all film caps now and the brittleness is gone. Sounds much better
Makes affordable electrolytic behave like bipolar.
Wired anode to anode or cathode to cathode in series
makes them non polarized
Should be rated at peak voltages, not RMS
Wired anode to anode or cathode to cathode in series
makes them non polarized
Should be rated at peak voltages, not RMS