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[rodney Coro almonte]

I just heard this sub this past week. http://www.ramsdellproaudio.com/products/subs/BP-SD21.htm

All I can say is WOW, for its size and price range I can't think of anything that can compete for output.  I heard two of them in a club, but I will get a chance to listen to six of them at an outdoor event in december.  I will let you know in a few weeks, how they performed outdoors.

[Gene Hardage]

rodney Coro almonte wrote on Thu, 20 November 2008 12:36

I just heard this sub this past week. http://www.ramsdellproaudio.com/products/subs/BP-SD21.htm All I can say is WOW, for its size and price range I can't think of anything that can compete for output.  I heard two of them in a club, but I will get a chance to listen to six of them at an outdoor event in december.  I will let you know in a few weeks, how they performed outdoors.

Ditto on the WOW dept.

They've got several things going for them.  First of all - they look awsome...



Next they have lots of smooth-tight-loud low end that could make any DJ synth or 5 stringer happy.   Of course there are lots of boxes that get down, but this one is truly special.  For it's size - it's really hard to beat.

Where and when is the December gig with 6 of them gonna be?

[drewgandy]

Quote:

* Measurement Made Using 2.83 Volt, 4th Order, Band-limited Pink Noise from 38 - 80 Hz    * One Cabinet Measured 106 dB and Two Cabinets In Parallel at four Ohms were measured to be 109 dB

This little bit of info doesn't seem to add up.  With 2 cabs in parallel I would expect a roughly 6 db rise in sensitivity.  Otherwise, yes they look awesome.  Little jet engines.  I wonder if you can use them to warm your hands on that outdoor gig.  (oh, its in florida isn't it?)  

[Ivan Beaver]

drewgandy wrote on Wed, 03 December 2008 15:17

Quote:      * Measurement Made Using 2.83 Volt, 4th Order, Band-limited Pink Noise from 38 - 80 Hz    * One Cabinet Measured 106 dB and Two Cabinets In Parallel at four Ohms were measured to be 109 dB This little bit of info doesn't seem to add up.  With 2 cabs in parallel I would expect a roughly 6 db rise in sensitivity.  Otherwise, yes they look awesome.  Little jet engines.  I wonder if you can use them to warm your hands on that outdoor gig.  (oh, its in florida isn't it?)

Unless the input voltage was dropped to 2 volts for a 1 watt input.

Also the use of pink noise is questionable.  Is the reading of the "average" of the pink noise signal or the top of the crest-which typically is 6 db higher and up to 12dB.

Or maybe better put, is the 2.83V the average of the pink noise signal or the peak.

Ther are all sorts of games that can be played with numbers and measurements.  Unless you know the rules (parameters of the test-test gear-measurement conditions etc), it is hard to tell exactly what you are dealing with sometimes.

[drewgandy]

Ivan Beaver wrote on Wed, 03 December 2008 14:29

Unless the input voltage was dropped to 2 volts for a 1 watt input. Also the use of pink noise is questionable.  Is the reading of the "average" of the pink noise signal or the top of the crest-which typically is 6 db higher and up to 12dB. Or maybe better put, is the 2.83V the average of the pink noise signal or the peak. Ther are all sorts of games that can be played with numbers and measurements.  Unless you know the rules (parameters of the test-test gear-measurement conditions etc), it is hard to tell exactly what you are dealing with sometimes.

Yes, without some graphs and more detail....

Assumed that the two lines of notes were to be taken together so - 2.83v it is.  But if the drive voltage was dropped (how daring) then of course the numbers add up.  

I do find the 106db number to be rather unbelievable for a box that size.  Since there is no graph showing the actual shape of the response it may be a case of picking the spot with the best view.  38hz is probably well below 100db.  But again, this is mere speculation.  It is after all, blue.  

drew

[rodney Coro almonte]

Unfortunately, that outdoor gig was canceled. It was going to happen in Channel side but the sponsor pulled out.

I do believe that the night club I work for just ordered 2 of them. Once they come in and get installed I will let you know.

[Marjan Milosevic]

106 db?

That is definitely by marketing measurement scale.
Or it is true at some unusable frequency like 250Hz or so.

[Ivan Beaver]

Here is a good idea of how "numbers" can be used.

At a gig a little while ago I got the following readings at the same position with the same meter-same band-same PA.  The only difference being what scale/weighting was used.

A weighted slow  around 106dB.

C weighted slow   around 120dB

C weighted fast  around 128dB

Peak fast response  around 136dB

So when the question comes up "how loud was it" what is the correct answer?  And also the question of how loud the cabinets could get would be?

30 dB is a difference of 1000 times!!!(in power)  So if this was a single loudspeaker you could either use 1 watt or 1000 watts to get the reading-depending on the measurement used.

For every complex question, there is a simple-easy to understand-WRONG answer.  You have to have DETAILS to fully explain something like a loudspeaker response.

[drewgandy]

Ivan Beaver wrote on Wed, 03 December 2008 17:07

Here is a good idea of how "numbers" can be used. At a gig a little while ago I got the following readings at the same position with the same meter-same band-same PA.  The only difference being what scale/weighting was used. A weighted slow  around 106dB. C weighted slow   around 120dB C weighted fast  around 128dB Peak fast response  around 136dB So when the question comes up "how loud was it" what is the correct answer?  And also the question of how loud the cabinets could get would be? 30 dB is a difference of 1000 times!!!(in power)  So if this was a single loudspeaker you could either use 1 watt or 1000 watts to get the reading-depending on the measurement used. For every complex question, there is a simple-easy to understand-WRONG answer.  You have to have DETAILS to fully explain something like a loudspeaker response.

Amen.

[Matt Vivlamore]

Ivan Beaver wrote on Wed, 03 December 2008 18:07

Here is a good idea of how "numbers" can be used. At a gig a little while ago I got the following readings at the same position with the same meter-same band-same PA.  The only difference being what scale/weighting was used. A weighted slow  around 106dB. C weighted slow   around 120dB C weighted fast  around 128dB Peak fast response  around 136dB So when the question comes up "how loud was it" what is the correct answer?  And also the question of how loud the cabinets could get would be? 30 dB is a difference of 1000 times!!!(in power)  So if this was a single loudspeaker you could either use 1 watt or 1000 watts to get the reading-depending on the measurement used. For every complex question, there is a simple-easy to understand-WRONG answer.  You have to have DETAILS to fully explain something like a loudspeaker response.

Isn't there big difference in the weights on the low end (200 or 300 and below)?
A weight is the human ear.
C weight is almost flat (typical full range of a loud speaker).