You May Have Seen This Before...

QUOTE (hifi_nut @ July 10, 2006 12:53 pm)

QUOTE (dnewma04 @ July 10, 2006 01:00 pm)

It's unusual for a human to hear below 28hz and almost impossible to find someone who really can hear the quote 20-20khz. AFAIK, no human has ever been able to hear this range that has been -*test*-('")ed. 28-16khz is typical for someone with excellent hearing. 24-18khz is a freak.

Talk about learning something new everyday. soundt/banana.gif

The 20-20khz has become such a common place in audio specifications that I took it for granted it was the rule, not the exception.

Jorge

Th source of that info came from a buddy of mine who studies hearing loss. I'll try to get him to verify that and post a followup.

Some of you may have seen this pic elsewhere *ahem*. Not much, but it's all mine and paid for. The TV and VCR aren't connected to the stereo at all; the cables and switch on the left enable me to choose to have the antenna signal go straight to the tuner, or to the VCR through an adjustable attenuator. Sorry it's out of focus; cheapie camera and/or lousy photographer. I since have 2"/50mm foam rubber under the Dual to kill vibrations from walking in the room.

QUOTE (steamer @ July 10, 2006 07:58 pm)

QUOTE (dnewma04 @ July 10, 2006 08:00 am)

Steamer, when you heard 16hz, you weren't hearing the fundamental (human hearing doesn't go anywhere near that low), you were hearing harmonics and vibrations in the room. There is no doubt you felt it, though.

It's unusual for a human to hear below 28hz and almost impossible to find someone who really can hear the quote 20-20khz. AFAIK, no human has ever been able to hear this range that has been -*test*-('")ed. 28-16khz is typical for someone with excellent hearing. 24-18khz is a freak.

Are your Bag End subs of the variety that runs entirely below the drivers resonant freq?

dnewma04,
Yes I agree with you,I have read that before.I guess the reason why it is said that you can't locate the output from a typical sub.I know I'm not a freak..lol,just speaking in general terms.
Yes the BagEnd is operated below its resonant freqency and is a highly damped sealed enclosure.BagEnds approach to low freq. reproduction is to take a sealed enclosure which has a predictable roll off of 12db per octive(phisics)and provide gain in proportion with a dual integrator circuit.The integrator circuit has minimal delay and phase shift compared to a low pass filter.The signals passed to the mains have thier polarity reversed to bring them back in phase with the low freqencies.
Greg

nevermind,had some more info but cant get it posted

This is the first time I've really had time to sit back and admire your system Jorge. The speakers look awesome soundt/master.gif

. You must've had the patience of a saint building those speakers (bet that started a few arguments with your missus!

). Adding lead plates is just showing off now!

How do you manage to lift the speakers up to carry them, or did you just build them in situ? I've always fancied one of those Pioneer crossovers. It's a D-23 isn't it? Not seen one on eBay for a long time now. Probably wouldn't even know what to do with it if I got one! Did you need an SPL meter to get the crossover points and slopes correct, or was it a lot more complicated than that?

PS - I have a little annoucement to make later on so watch this space.....

QUOTE (ToTo Man @ September 18, 2007 11:00 am)

This is the first time I've really had time to sit back and admire your system Jorge. The speakers look awesome soundt/master.gif

. You must've had the patience of a saint building those speakers (bet that started a few arguments with your missus!

). Adding lead plates is just showing off now!

How do you manage to lift the speakers up to carry them, or did you just build them in situ? I've always fancied one of those Pioneer crossovers. It's a D-23 isn't it? Not seen one on eBay for a long time now. Probably wouldn't even know what to do with it if I got one! Did you need an SPL meter to get the crossover points and slopes correct, or was it a lot more complicated than that?

PS - I have a little annoucement to make later on so watch this space.....

Yeah, these buggers took me some time to build, but I figured they would remain with me for life, so what the heck...( better drivers are noy out of the question, obviously ).

I´m too old and wise to lift things like this, weighing in at 90 kgs each Onken bass-box alone, so I added castors at the bottom. Purists will say nothing beats spikes, but being this heavy I say, screw them.

The lead sheets were not just showing off, Richard, they serve a very clear purpose of totally ( well, almost ) deadening the speaker boxes. Quite the opposite of some cardboard subwwofers someone I know built a couple of years ago. soundt/jump.gif

The crossover is indeed the D-23. Very rare and usually go for very high prices.

Can´t wait to hear what news you have in store for us. Don´t keep us hanging for too long, ok?