Which design to have in-a-car-like sound pressure? - Page 3

moray james · 23rd July 2008, 08:21 PM

shakers on your chair or couch to achieve the visceral impact via mechanical rather than acoustic coupling. Easier on your elrctric bill, house and your neighbours. A combination of mechanical and acoustic should turn the trick.

Pano · 23rd July 2008, 08:59 PM

good idea Moray...

sreten · 24th July 2008, 01:52 PM

Quote:

Originally posted by Doug Kim

Sreten,
Thanks a lot for the informative reply.
So if we go back to my original question, is there any one type of speaker that are (generally, statistically, whatever) accepted to be good for that purpose? I'm just wondering my knowledge I got from somewhere (probably wrong) that closed box 3-way design with 12" or 15" woofer is good for this (think about Cello Stradivari Legend).

Doug

Hi,

A big 3 way should have by default 2 of the requirements for slam :
good bass extension and good volume capability in the extreme bass.

The third, good transient response can be achieved by either sealed
or vented alignments. Its not so easy vented, but any downside of
this is compensation by the vented arrangements extra volume
capability around the port frequency, equivalent to 4 sealed drivers.

/sreten.

Salas · 24th July 2008, 11:21 PM

Quote:

Originally posted by MaVo
The slam in the chest is around 80hz i think, maybe 70 if you are a big guy.

130Hz actually.

tiltedhalo · 24th July 2008, 11:52 PM

Might try these http://www.passdiy.com/pdf/el-pipe-o.pdf

RJ · 25th July 2008, 03:52 PM

Here you go. No one mentioned bass horns. Check out the SPL level with 2.83 volts. Guaranteed to pressurize a living room.
Another way to do it is with 10 Dayton DA-175 7" woofers in a line array. Guaranteed to slam you int the chest.
http://www.billfitzmaurice.com/T48.html
http://www.partsexpress.com/pe/showd...number=295-335

Doug Kim · 25th July 2008, 04:17 PM

Quote:

Originally posted by RJ
Here you go. No one mentioned bass horns. Check out the SPL level with 2.83 volts. Guaranteed to pressurize a living room.
Another way to do it is with 10 Dayton DA-175 7" woofers in a line array. Guaranteed to slam you int the chest.
http://www.billfitzmaurice.com/T48.html
http://www.partsexpress.com/pe/showd...number=295-335

Thanks for the suggestion. 10 woofers, whoa. I'll just go with subwoofer route maybe.

Doug

Don Bunce · 25th July 2008, 09:35 PM

"No one mentioned bass horns"

Back at post #9 I recommended a pair of Labhorns.Even one,corner loaded,will beat a stack of sealed boxes.Before I built the LABhorns,I had eight 12" HSU Research ASW1202 drivers in sealed boxes.They didn't stand a chance against the LABhorn.Ten 7" Daytons won't either...

To keep up with horn subs,you will need horns for the rest of the system.

Here is a pic of my system before I built a second LABhorn.Midbass is 1/2 space 110 hz expo horn(similar to Altec A7)with Altec 416 driver,midrange is 345 hz Tractrix horn with JBL 2441 driver,and tweeter is Fostex T925a.

Will cruise at 110-120 db without breaking a sweat...

http://img244.imageshack.us/img244/7739/0000001ix7.jpg

Doug Kim · 25th July 2008, 09:41 PM

Hi Don,

Your suggestion of horns just reminds me of my postponed project: building a horn-based high-eff system.
I have a pair of Fostex H420 wood horns that are mated with JBL LE85 drivers. I'm going to cross them over at 900Hz and am going to add T925a also, but couldn't decide the bass unit yet. I am thinking about several things, but I really don't want anything too large.
What about using Madisound BK-20 as bass unit? The lowest end will be only like 50Hz but as my posts in this thread notices, I am concerned about bass slam, not whale's language.
Or where can I get those tractrix horns for 15" units?

Thanks

Doug

Don Bunce · 25th July 2008, 10:53 PM

I built a pair of thr bk16's a while back,with Fostex ff165K.They were OK ,but slam is not a word I would use to describe them.I wouldn't expect the bk20's to be much better,but I haven't heard them.

I turned the horns myself,but you can get tractrix horns from edgarhorn.com.He also sells a kit horn shell for 15" drivers.

The Altec 825/828 (A7 Voice of the Theater)cabinet will also work well,plans are available on the net.

A Karlson K15 would be a good choice,too,and has the slam you are looking for.

http://home.planet.nl/~ulfman/

Freddyi is the resident guru on Karlsons on the hi-eff speaker forum at audioasylum.com

23rd July 2008, 08:21 PM	#21
moray james diyAudio Member Join Date: Aug 2003 Location: Calgary on the Bow	you might also consider.... shakers on your chair or couch to achieve the visceral impact via mechanical rather than acoustic coupling. Easier on your elrctric bill, house and your neighbours. A combination of mechanical and acoustic should turn the trick. __________________ moray james

23rd July 2008, 08:59 PM	#22
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	good idea Moray... __________________ Take the Speaker Voltage Test!

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24th July 2008, 11:52 PM	#25
tiltedhalo diyAudio Member Join Date: Sep 2005 Location: Melbourne Florida	Might try these http://www.passdiy.com/pdf/el-pipe-o.pdf

25th July 2008, 03:52 PM	#26
RJ diyAudio Member Join Date: Oct 2004	Here you go. No one mentioned bass horns. Check out the SPL level with 2.83 volts. Guaranteed to pressurize a living room. Another way to do it is with 10 Dayton DA-175 7" woofers in a line array. Guaranteed to slam you int the chest. http://www.billfitzmaurice.com/T48.html http://www.partsexpress.com/pe/showd...number=295-335

25th July 2008, 09:35 PM	#28
Don Bunce diyAudio Member Join Date: Mar 2007	"No one mentioned bass horns" Back at post #9 I recommended a pair of Labhorns.Even one,corner loaded,will beat a stack of sealed boxes.Before I built the LABhorns,I had eight 12" HSU Research ASW1202 drivers in sealed boxes.They didn't stand a chance against the LABhorn.Ten 7" Daytons won't either... To keep up with horn subs,you will need horns for the rest of the system. Here is a pic of my system before I built a second LABhorn.Midbass is 1/2 space 110 hz expo horn(similar to Altec A7)with Altec 416 driver,midrange is 345 hz Tractrix horn with JBL 2441 driver,and tweeter is Fostex T925a. Will cruise at 110-120 db without breaking a sweat... http://img244.imageshack.us/img244/7739/0000001ix7.jpg

25th July 2008, 09:41 PM	#29
Doug Kim diyAudio Member Join Date: Apr 2008 Location: Maryland, USA	Hi Don, Your suggestion of horns just reminds me of my postponed project: building a horn-based high-eff system. I have a pair of Fostex H420 wood horns that are mated with JBL LE85 drivers. I'm going to cross them over at 900Hz and am going to add T925a also, but couldn't decide the bass unit yet. I am thinking about several things, but I really don't want anything too large. What about using Madisound BK-20 as bass unit? The lowest end will be only like 50Hz but as my posts in this thread notices, I am concerned about bass slam, not whale's language. Or where can I get those tractrix horns for 15" units? Thanks Doug

25th July 2008, 10:53 PM	#30
Don Bunce diyAudio Member Join Date: Mar 2007	I built a pair of thr bk16's a while back,with Fostex ff165K.They were OK ,but slam is not a word I would use to describe them.I wouldn't expect the bk20's to be much better,but I haven't heard them. I turned the horns myself,but you can get tractrix horns from edgarhorn.com.He also sells a kit horn shell for 15" drivers. The Altec 825/828 (A7 Voice of the Theater)cabinet will also work well,plans are available on the net. A Karlson K15 would be a good choice,too,and has the slam you are looking for. http://home.planet.nl/~ulfman/ Freddyi is the resident guru on Karlsons on the hi-eff speaker forum at audioasylum.com