SPL gets higher?

frank2627 · 31st May 2011, 09:18 PM

A question from a complete beginner. If I buy, lets say a full range driver of 89 dB (no particular brand or type), and I put it a horn-cabinet (frugal or else); will the real SPL of the speaker be higher? If so, what is the expected gain in dB?

picowallspeaker · 31st May 2011, 09:29 PM

Any kind of cabinet will do that . What ? To prevent the back emission of the speaker to 'collide' with the front wave (acoustic short-circuit ).
If the cabinet is provided with some port ,the sum of the driver + port will be major if they are in phase .
This happens also with horns .

frank2627 · 31st May 2011, 09:39 PM

yes, I 've been looking around to find an DIY enclosure en driver, proven "excellent" , but about 103 db SPL because I use a 13 Watt T-amp (8 ohm). So, i need to know approx what gain (in dB) to expect.
I would like to build an Horn, single driver. Cost en difficulty woodskill, are no problem.

tinitus · 31st May 2011, 09:53 PM

frugal is backloaded
it will only give gain in bass, and maybe some midbass
about 90db it is

picowallspeaker · 31st May 2011, 10:06 PM

No single driver ,sorry

The magic word is ' differentiation'
Happens also with humans ,you know , male-female ...

Once the driver (woofer ) has some acoustic load , it works on its specific bandwidth , so the woofer has to move lot of air . It 's his job ,and also the enclosure , which also supports the tweeter ,which has to be phisically near the woofer ; the tweeter makes also vibrate the air ,but at higher speed (frequency) . To get reasonable SPL ...those drivers need to be very good .
The only thing that comes to my mind is the Econowave project , which is a tipical PA style speaker ,with a big and efficient woofer (not in horn enclosure ,too keep also space...efficient) and a compression driver as a tweeter.
Compression driver needs a horn...so you're done !!!

chris661 · 31st May 2011, 10:18 PM

A horn will make a driver more efficient in its operating range.

For example, I have a pair of tapped horns. The same drivers in a sealed box would be of <70dB@1w for the frequencies I use them for. The tapped horns are at more like 85dB.

To increase the entire SPL curve, you'll need either a very large front loaded horn (like a big compression driver), or a combination of front and back horn loading of the same driver. There are few examples of this: a tribute to the sheer difficulty of such a thing.

Good luck,
Chris

frank2627 · 1st June 2011, 05:31 AM

What I'm searching for is indeed not yet to find, lots of designers say A&B about the concept but not "C" - the figures of SPL by example.

I considered, buy an T-path modules of ca. 300watt (4ohm) and make active enclosures with a good broadband driver.

However, help me with finding excellent broadband drivers (for horn designs) with high (+95 dB) figures please.

31st May 2011, 09:18 PM	#1
frank2627 diyAudio Member Join Date: May 2011	SPL gets higher? A question from a complete beginner. If I buy, lets say a full range driver of 89 dB (no particular brand or type), and I put it a horn-cabinet (frugal or else); will the real SPL of the speaker be higher? If so, what is the expected gain in dB?

31st May 2011, 10:18 PM	#6
chris661 diyAudio Member Join Date: Feb 2008 Location: Lancashire Blog Entries: 7	A horn will make a driver more efficient in its operating range. For example, I have a pair of tapped horns. The same drivers in a sealed box would be of <70dB@1w for the frequencies I use them for. The tapped horns are at more like 85dB. To increase the entire SPL curve, you'll need either a very large front loaded horn (like a big compression driver), or a combination of front and back horn loading of the same driver. There are few examples of this: a tribute to the sheer difficulty of such a thing. Good luck, Chris __________________ "Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo My setup: http://www.diyaudio.com/forums/multi...tang-band.html

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31st May 2011, 09:29 PM	#2
picowallspeaker diyAudio Member Join Date: Apr 2007	Any kind of cabinet will do that . What ? To prevent the back emission of the speaker to 'collide' with the front wave (acoustic short-circuit ). If the cabinet is provided with some port ,the sum of the driver + port will be major if they are in phase . This happens also with horns .

31st May 2011, 09:39 PM	#3
frank2627 diyAudio Member Join Date: May 2011	yes, I 've been looking around to find an DIY enclosure en driver, proven "excellent" , but about 103 db SPL because I use a 13 Watt T-amp (8 ohm). So, i need to know approx what gain (in dB) to expect. I would like to build an Horn, single driver. Cost en difficulty woodskill, are no problem.

31st May 2011, 09:53 PM	#4
tinitus diyAudio Moderator Join Date: Nov 2005	frugal is backloaded it will only give gain in bass, and maybe some midbass about 90db it is

31st May 2011, 10:06 PM	#5
picowallspeaker diyAudio Member Join Date: Apr 2007	No single driver ,sorry The magic word is ' differentiation' Happens also with humans ,you know , male-female ... Once the driver (woofer ) has some acoustic load , it works on its specific bandwidth , so the woofer has to move lot of air . It 's his job ,and also the enclosure , which also supports the tweeter ,which has to be phisically near the woofer ; the tweeter makes also vibrate the air ,but at higher speed (frequency) . To get reasonable SPL ...those drivers need to be very good . The only thing that comes to my mind is the Econowave project , which is a tipical PA style speaker ,with a big and efficient woofer (not in horn enclosure ,too keep also space...efficient) and a compression driver as a tweeter. Compression driver needs a horn...so you're done !!!

1st June 2011, 05:31 AM	#7
frank2627 diyAudio Member Join Date: May 2011	What I'm searching for is indeed not yet to find, lots of designers say A&B about the concept but not "C" - the figures of SPL by example. I considered, buy an T-path modules of ca. 300watt (4ohm) and make active enclosures with a good broadband driver. However, help me with finding excellent broadband drivers (for horn designs) with high (+95 dB) figures please.

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