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Old 21st April 2012, 12:51 AM   #241
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Quote:
Originally Posted by aptquark View Post
someone please explain how the BSC can be "built in"? I've heard this and dont quite get it.
Thanks
Hi Apt, Chris (your post 232), Fellas.
Ummmmmmph..........BSC (BTW, also stands for "British Sugar Corporation", a little bit of trivia for your amusement).

Right oh, let me have a go at explaining how BSC is done. First off, take another look at the FF125WK. At first glance, it looks similar to the Alp10 Gen. 2, similar cone and coil dimeters etc., but the devil is in the detail:

Compare the 125's and Alp10's coil winding lengths and/or X-max, quoted SPL's and Mms. Note the short coil, smaller X-max, lighter Mms and higher SPL on the 125WK. These features are the tell-tail signs of the designers intension to give efficiency the priority. Now read Dave's (Planet 10) post No. 82:

Alpair 12P Gen. 2 (paper cone)

So, to get more bass, I long ago (2003) started experimenting with "long throw-light mass" power-train designs. Most Full-Range driver designers won't venture into this territory as controlling mechanical distortion within the power-train under load is a nightmare. Added into the mix is the tougher challenge to accurately manufacture such power-train components. The difficulty assembling said parts also increases, climbing reject rates usually results.

I've now got to the point in development where I've overcome most of the challenges and can design and produce drivers that are mechanically efficient in the lower ranges. The driven power consumption (loss) to mass ratio is lower, thanks mostly to the work of the suspensions and mass reductions in the critical components of the power-train.

Try this method/observation: Take an Alpair 10, place on a desk or table, cone face up. Place your fingers on its dust cap and VERY GENTLY push downwards. Note how easy the power-train stroke extends (DON'T GO TOO FAR). Note the 10's linearity. It takes the same light effort to push the power-train all the way to around 8-mm before you'll start to feel increased resistance. At this point, STOP pushing and RAPIDLY take your fingers off the cap. Note how the 10's power-train returns to its rest position. Its very fast with no bouncing, it gets to its rest position and stops.

Now try the same method with a 125WK (or similar) and you'll immediately feel the difference in the compliance. Likely you'll only be able to push its power-triain 2 or 3mm before it tightens up.

So fellas, this a quick potted history on how I do BSC. Along with my suggested driver demonstration/observation, hopefully should give you a fair practical idea of differences in the design approach to the drivers.

The end result is most Marlaudio drivers generate an emittance gain in the lower ranges.

Have fun and cheers

Mark.

Last edited by markaudio; 21st April 2012 at 03:47 AM.
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Old 21st April 2012, 07:23 PM   #242
tof654 is offline tof654  China
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Many thanks Mark, I will do! Rgds
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Old 21st April 2012, 08:06 PM   #243
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Thanks Mark. I kinda get it. But would this be correct in stating thats its not really a "true" BSC? Or just the ability to better compensate because of its mechanical advantages?

Also, thanks Wushuliu.

Last edited by aptquark; 21st April 2012 at 08:10 PM.
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Old 21st April 2012, 08:36 PM   #244
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What is true BSC?

dave
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Old 22nd April 2012, 01:41 PM   #245
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Quote:
Originally Posted by planet10 View Post
What is true BSC?

dave
I DUNNO! DONT PUT ME ON THE SPOT..THATS MY JOB!!!!!!!

I thought that you have to work with cab size OR some circuit to have true BSC.

But then it doesnt matter I guess..if you can get the results you want doing it differently.
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Old 22nd April 2012, 01:44 PM   #246
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Wait a min., if you can do BSC like Mark has...then it would be better to not add more to the circuit right? OR, make a cab bigger for that matter when you dont have to right?

Wait another min., can you add a circuit for BSC with full range drivers? Or is that just a multiway thing?


Another question, how many other speakers use this built in BSC? Is this one of Mark's unique design applications?

Last edited by aptquark; 22nd April 2012 at 01:52 PM.
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Old 23rd April 2012, 05:37 AM   #247
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by aptquark View Post
I DUNNO! DONT PUT ME ON THE SPOT..THATS MY JOB!!!!!!!

I thought that you have to work with cab size OR some circuit to have true BSC.

But then it doesnt matter I guess..if you can get the results you want doing it differently.
Quote:
Originally Posted by aptquark View Post
Wait a min., if you can do BSC like Mark has...then it would be better to not add more to the circuit right? OR, make a cab bigger for that matter when you dont have to right?

Wait another min., can you add a circuit for BSC with full range drivers? Or is that just a multiway thing?


Another question, how many other speakers use this built in BSC? Is this one of Mark's unique design applications?


keep on answering your own questions - it'll not only save others a lot of time, but you'll tend to have more faith in the veracity of the author

unless you second guess yourself
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Old 23rd April 2012, 01:44 PM   #248
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Baffle step is a consequence of a speaker on a "not infinite" baffle. Impacts any driver on a baffle that is reproducing lower frequencies.

You will note that many of the popular full range designs do not apply BSC. It is not, IMO, a make or break decision for many applications.


Quote:
Originally Posted by aptquark View Post
Wait a min., if you can do BSC like Mark has...then it would be better to not add more to the circuit right? OR, make a cab bigger for that matter when you dont have to right?

Wait another min., can you add a circuit for BSC with full range drivers? Or is that just a multiway thing?


Another question, how many other speakers use this built in BSC? Is this one of Mark's unique design applications?
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Old 23rd April 2012, 02:03 PM   #249
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Yea...I figured I had done that LOL
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Old 23rd April 2012, 02:05 PM   #250
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Quote:
Originally Posted by fastbike1 View Post
Baffle step is a consequence of a speaker on a "not infinite" baffle. Impacts any driver on a baffle that is reproducing lower frequencies.

You will note that many of the popular full range designs do not apply BSC. It is not, IMO, a make or break decision for many applications.
gotcha. thanks
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