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Author Topic: Bruce Rozenblit comments on the FFRS Mark 4:20 i  (Read 3749 times)
Ed Schilling
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« on: August 08, 2013, 07:40:01 PM »

Bruce added it to his DIY speaker page and gives a little technical info...........

http://www.transcendentsound.com/Transcendent/Subwoofer.html

Ed
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Henry
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« Reply #1 on: August 09, 2013, 04:22:12 PM »

Affirmation is nice... especially when it comes from someone smart and brutally honest like Bruce. Good for you, Ed. Grin

Real time analysis in a typical live listening room shows the Bucket Sub to be essentially flat from 25 Hz to 100Hz.  One Bucket Sub can produce that output up to about 106 dB then it starts running out of steam.  Two should be able to reach at least 109 dB.  That is a tremendous amount of low frequency energy that will cause dishes to rattle and the house to shake.  The sound is smooth, without being boomy or uneven.  Transients are quick and not the least bit mushy.  The relatively small and lightweight cone contributes to its speed.  The Bucket Sub greatly benefits from lots of current drive so a high power class D plate amp is essential.  Performance improves as current drive goes up.  Several hundred watts will get the job done.  Corner placement works well as it is up firing. 

The way the thing works is by taking a speaker that was never intended for pure subwoofer operation and forcing it acoustically and electrically to perform as a super sub.  The massive current drive pushes it in a very linear fashion.  Since it is basically operating out of its intended range, it must be crossed over at low frequencies.  At frequencies above 200 Hz, the output will begin to rise relative to the bottom octaves.  For this reason, its use must be restricted to pure subwoofer operation.  A minimum 12 dB/octave low pass filter is required and 24 dB/octave will increase performance.

Properly adjusted, the Bucket Sub will blend seamlessly into a main speaker system.  It just disappears, except for the low end foundation that it provides.  This is ideal performance for a subwoofer.  This thing can be built for $75 in about one hour.  It is no doubt the greatest value in DIY audio available.               
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Pit Hinder
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« Reply #2 on: August 17, 2013, 06:46:26 PM »

"in a typical live listening room" -
THAT is the moment when the elephant takes her panties off!
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Henry
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« Reply #3 on: January 15, 2015, 12:24:57 PM »

Here's a good deal on the Crown amp...

http://www.parts-express.com/crown-xls-1000-power-amplifier-2-x-350w-at-4-ohms--245-500?utm_source=Retail&utm_medium=Email_Newsletter&utm_content=245-500&utm_campaign=email011515B
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Steve F
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« Reply #4 on: January 30, 2015, 04:14:48 PM »

Amazon is running a sale too. The XLS 1000 and 1500. The 1500 and up have lower noise specs than the 1000.

steve
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NH7RO
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« Reply #5 on: November 19, 2016, 05:58:59 PM »

Peerless 830667 on sale through December 31, 2016 at Parts Express  $66>>>$58; free shipping on $100+ orders...
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