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Old 30th June 2007, 10:27 PM   #11
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or what about 2 of these in parallel http://cgi.ebay.ca/12-inch-Classic-L...QQcmdZViewItem ?
Can you make a bodgy rule of thumb, more drivers = more noise? The Blue Marvel like is 8ohms, so 2 16s would be fine and the amplifier would handle it?
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Old 30th June 2007, 10:58 PM   #12
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Harry, don't confuse increased clarity with "increased volume". Keep in mind: all speaker manufacturers lie, it is the nature of the game that speaker manufacturing has become ... is thus and ever shall be.

An SPL of 100 db may simply indicate that the driver is able to survive being driven by a rounded corner square wave of 922 htz. of reduced distortion from a 1000 watt source ... without self destruction ...

Your original 96.5 db spl drivers may actually sound better and have an apparent loudness greater than a similar driver with a manufacturers' rating of 105 db ...
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Old 1st July 2007, 09:33 AM   #13
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yes point taken. So what about a real Vintage 30, increased loudness?
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Old 1st July 2007, 09:01 PM   #14
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Quote:
Originally posted by FastEddy
An SPL of 100 db may simply indicate that the driver is able to survive being driven by a rounded corner square wave of 922 htz. of reduced distortion from a 1000 watt source ... without self destruction ...
Umm... the 100dB normally refers to sensitivity, so given equal power handling, and specs suited to running in a similar cabinet design, a 100dB should be louder than a 96dB if you're feeding it the same amount of power.

Of course it's possible to have a louder speaker with lower sensitivity, given a huge amount more power.

-Nick
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Old 1st July 2007, 10:03 PM   #15
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but as the limiting factor is the 65 amplifier unit, how much louder do you thikn 100 would be? Would he have to go even more sensetive. Also, can anyone comment on the tonal differnece between Blue Marvel and Celestion?
The problem with the Vintage 30 is the power handling is 60w, and 65 can be supplied. Could this be a problem if he cranks it right up?
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Old 1st July 2007, 10:38 PM   #16
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right, so how about a Celestion G12 Century in an open back. 102dB, power handling 80W, Fs 85Hz. A bit high I know, but would it be very noticable in an open back?
Also itt would be a simple easy way of getting more volume without experimenting with multiple drivers (including possible amp loading complications).
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Old 3rd July 2007, 06:50 AM   #17
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Quote:
Originally posted by harrygrey382
but as the limiting factor is the 65 amplifier unit, how much louder do you thikn 100 would be? Would he have to go even more sensetive. Also, can anyone comment on the tonal differnece between Blue Marvel and Celestion?
The problem with the Vintage 30 is the power handling is 60w, and 65 can be supplied. Could this be a problem if he cranks it right up?
Well, since dB represents a ratio, you can just subtract them and assuming nobody's lying (or that they're lying the same amount) that's how much louder it will be.

a 100dB driver is 4dB louder than a 96dB

If you want it to sound twice as loud, you need to add about 10dB though.
it adds up quick.

Sometimes what's actually needed is some distortion. That will often make it sound louder, as with the tube amp phenomenon that was mentioned earlier.

-Nick
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Old 3rd July 2007, 08:14 AM   #18
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yeah ok. What about if I ran 2 drivers say. So say two Vintage 30's (In series to keep the the impedance above 8, I don't know whether the amp would handle 4?) against one G12 Century. Which would produce more noise? He does want distortion but says he wants it louder before distortion.
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Old 3rd July 2007, 11:03 AM   #19
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Hi,

Quote:
Originally posted by harrygrey382
He does want distortion but says he wants it louder before distortion.
Look for a cone that's reinforced (ribbed). They have a later breakup than a smoother cone.
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Old 3rd July 2007, 11:46 AM   #20
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Lots of info here:

http://www.dogstar.dantimax.dk/tubestuf/

http://www.diyguitaramp.com/tech.html

http://www.geofex.com/gtramps.htm

http://www.amptone.com/

http://www.ax84.com/
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