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Bozak B-800 Speaker Build Completed, +Question

guyhifi

New Member
Thanks goes out to DrBiggles and homebrew for their suggestions, I was able to complete my Bozak B-800 speakers. All I can say is WOW!

As All-Range drivers, I felt that the speakers lacked clarity and high-end, so I built and incorporated 2 way crossovers consisting of a 0.60 mH inductor and a 10K capacitor, along with dirt cheap tweeters I found on ebay - rated at 1500-20000 at 8 ohms. The crossovers cross over at 2000. What a huge and dramatic difference!!!

I have run multiple frequency tests from various sources on YouTube, surprisingly they have yielded the same results with no variation. As an older person, the highest frequency that I can hear is roughly 13,500. A friend was able to hear up to about 17,000.

The Bozak B-800A is supposedly rated down to about 100 hz. What puzzles me is that with all of the tests that I have run, I am consistently able to hear tones all the way down to about 20 hz. Which leads me to some questions:

1. How is this driver able to produce tones down to 20 hz if it is only "rated" at 100 hz?

2. Though I am able to hear low tones down to 20 hz, they are not as balanced (loud) as the mid-range and high frequencies. Is there any way that I can modify the crossover to boost the volume of the low end without affecting the mid and high end? I am able to hear instruments such as an upright bass, lowest notes of a grand piano, timpani, etc., but the vocals in the midrange seem to be drowning them out. I don't have the funds or desire to obtain equalizers or such and would prefer to tinker with the crossover, if that is possible???

Amplification consists of a Van Alstine 100 wpc transistor amp and a Van Alstine Hybrid-tube preamp.


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  1. I couldn't find specs on the B-800A driver, but in a properly sized sealed enclosure, a driver should be able to produce output to its resonant frequency and even slightly below it.
  2. You can't boost frequencies with a passive crossover; that requires added power. The best you can do is reduce other frequencies to match, but that's not ideal. Better off with an equalizer.
 
Hay,
Huge congratulations for completing the project, you’re one cool dude. Let them run, your Ear may settle more out. Nice action.

Biggles
 
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