Double bass-reflex enclosure.

simpleacoustic · 20th October 2011, 03:54 PM

I am curious to know whether single 18" double bass reflex enclosures would be any good for outdoor djing and p.a uses if possible.I know they may turn out to be very large but just curious and which software can best model these with drivers and port front-facing.

Tytte71 · 20th October 2011, 05:08 PM

Quote:

Originally Posted by simpleacoustic

I am curious to know whether single 18" double bass reflex enclosures would be any good for outdoor djing and p.a uses if possible.I know they may turn out to be very large but just curious and which software can best model these with drivers and port front-facing.

I am not experienced with djing or PA, but the answer depends very much on what you want to acheive. For less crowded areas with limited distance to the crowd - why not?
If you for example take BMS 18N860 and use it in a 250 net litre BR cabinet and tune it to 23Hz, it could produce some 117dB/1m/1500W outdoor, baffle step diffraction loss taken into account. It's capacity extends relatively flat down to 23Hz and without getting outside xmax at 20Hz. That should leave you some 110dB "distortion free" average sound pressure level and low frequency electronic music should be no problem. It could off course be driven harder, but then outside its (by definition) linear operating range. Add another sub and you gain 6dB of maximum sound pressure - four subs +12dB and so on

By the way... this would also make a very nice sub for home use.

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Quackhead · 20th October 2011, 07:57 PM

Quote:

Originally Posted by simpleacoustic

I am curious to know whether single 18" double bass reflex enclosures would be any good for outdoor djing and p.a uses if possible.I know they may turn out to be very large but just curious and which software can best model these with drivers and port front-facing.

..hmm...come to think of it, I have never heard or seen anyone use a double bass reflex cab of any sort(that I am aware of). I am definately curious about the outcome of this thread...how is the efficiency with such a critter?

Tytte71 · 20th October 2011, 08:35 PM

Oh, thanks Quackhead... Didn't catch that the question was regarding double chambered bass reflex enclosure.
Then my answer is turned into a question, why not pick a proper designed driver with high xmax that does the job in a simpler box?

wintermute · 20th October 2011, 09:04 PM

You might want to have a read of this article by Claudio DCR

As far as I am aware the overall size of this style of DCR is no more than it would be for a single chamber bass reflex. The main advantage of DCR that I have seen mentioned is lower distortion.

Tony.

simpleacoustic · 20th October 2011, 09:22 PM

What about the RCF L18P300-It's popularly used for p,a here but never seen in this type of enclosure...Ts here
http://http://www.rcf.it/products/precision-transducers/low-frequency-transducers/l18p300

blakkshepeaudio · 20th October 2011, 09:51 PM

Just a reminder not to confuse the DCR on Claudio's excellent website, which has two chambers and three ports in total, with the DBR/DCAAV which has two chambers and two ports in total.

Different beasts.

revboden · 20th October 2011, 10:29 PM

AkAbak can sim a DBR... hope you have a lot of free time if you don't already know it.

simpleacoustic · 22nd October 2011, 04:51 PM

Quote:

Originally Posted by revboden

AkAbak can sim a DBR... hope you have a lot of free time if you don't already know it.

I'm very new at this stuff but I'm willing to try.Apparently v2.1is not compatible with win 7,where can I find it?

blakkshepeaudio · 23rd October 2011, 05:29 AM

Akabak should run under Win7 32 bit, but it does not run under Win7 64: at least, I haven't been able to make it go.
So I use it on my WinXP32 SP3 netbook, which works a treat.

There is also a 'Virtual XP' mode included in Win7 Ultimate (I think) and there is a 'VirtualXP' downloadable from Microsloth which I have, but haven't been game to try on my 'real' PC. My system is very stable and I am reluctant to mess with the OS too much.

20th October 2011, 03:54 PM	#1
simpleacoustic diyAudio Member Join Date: Mar 2010	Double bass-reflex enclosure. I am curious to know whether single 18" double bass reflex enclosures would be any good for outdoor djing and p.a uses if possible.I know they may turn out to be very large but just curious and which software can best model these with drivers and port front-facing.

20th October 2011, 09:04 PM	#5
wintermute just another diyAudio Moderator Join Date: Aug 2003 Location: Sydney Blog Entries: 22	You might want to have a read of this article by Claudio DCR As far as I am aware the overall size of this style of DCR is no more than it would be for a single chamber bass reflex. The main advantage of DCR that I have seen mentioned is lower distortion. Tony. __________________ Any intelligence I may appear to have is purely artificial! Some of my photos

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20th October 2011, 08:35 PM	#4
Tytte71 diyAudio Member Join Date: Oct 2010	Oh, thanks Quackhead... Didn't catch that the question was regarding double chambered bass reflex enclosure. Then my answer is turned into a question, why not pick a proper designed driver with high xmax that does the job in a simpler box?

20th October 2011, 09:22 PM	#6
simpleacoustic diyAudio Member Join Date: Mar 2010	What about the RCF L18P300-It's popularly used for p,a here but never seen in this type of enclosure...Ts here http://http://www.rcf.it/products/precision-transducers/low-frequency-transducers/l18p300

20th October 2011, 09:51 PM	#7
blakkshepeaudio diyAudio Member Join Date: Sep 2010 Location: Country Victoria Australia	Just a reminder not to confuse the DCR on Claudio's excellent website, which has two chambers and three ports in total, with the DBR/DCAAV which has two chambers and two ports in total. Different beasts.

20th October 2011, 10:29 PM	#8
revboden diyAudio Member Join Date: Feb 2011	AkAbak can sim a DBR... hope you have a lot of free time if you don't already know it.

23rd October 2011, 05:29 AM	#10
blakkshepeaudio diyAudio Member Join Date: Sep 2010 Location: Country Victoria Australia	Akabak should run under Win7 32 bit, but it does not run under Win7 64: at least, I haven't been able to make it go. So I use it on my WinXP32 SP3 netbook, which works a treat. There is also a 'Virtual XP' mode included in Win7 Ultimate (I think) and there is a 'VirtualXP' downloadable from Microsloth which I have, but haven't been game to try on my 'real' PC. My system is very stable and I am reluctant to mess with the OS too much.