Speakerplans.com Homepage
Forum Home Forum Home > Plans > New Projects Forum
  New Posts New Posts RSS Feed - 2x18" MEATGRINDER v2 (done!)
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

2x18" MEATGRINDER v2 (done!)

 Post Reply Post Reply Page  <1 910111213 22>
Author
Message
tomschute View Drop Down
Old Croc
Old Croc


Joined: 15 May 2006
Location: Mid Wales
Status: Offline
Points: 1817
Post Options Post Options   Thanks (0) Thanks(0)   Quote tomschute Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2009 at 3:40pm


edit: sorry V3 - 2.83V


Edited by tomschute - 12 September 2009 at 8:36am
Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk
Speaker Building Services
Back to Top
kiriiz View Drop Down
Registered User
Registered User


Joined: 09 January 2009
Status: Offline
Points: 70
Post Options Post Options   Thanks (0) Thanks(0)   Quote kiriiz Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2009 at 4:11pm
It seems like many widespread drivers work good in MGv3
Back to Top
Jake_Fielder View Drop Down
Old Croc
Old Croc


Joined: 08 October 2007
Status: Offline
Points: 4231
Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2009 at 4:26pm
Originally posted by levyte357 levyte357 wrote:

V3, Modelled with 2x V18-1000




Should be 2v

Im now playing with porting it
Back to Top
Jake_Fielder View Drop Down
Old Croc
Old Croc


Joined: 08 October 2007
Status: Offline
Points: 4231
Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2009 at 4:58pm
I couldnt do anything any good from porting it! bearing in mind the longest the port could be is about 90cm, and it coulnt be too large as there isnt much room, i was picturing two tubes going either side of the magnets.
Heres the plots overlayed, the one with slightly better response below 20Hz is the ported one...


It might sound more "scoopy" if ported as the group delay get big around 40Hz when compared to the standart horn design. And excursion is better low down.


Back to Top
tommysb View Drop Down
Registered User
Registered User


Joined: 24 April 2006
Location: Finland
Status: Offline
Points: 1036
Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2009 at 8:14pm
Where the porting becomes useful is in controlling excursion by the looks of it then!
Back to Top
tomschute View Drop Down
Old Croc
Old Croc


Joined: 15 May 2006
Location: Mid Wales
Status: Offline
Points: 1817
Post Options Post Options   Thanks (0) Thanks(0)   Quote tomschute Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2009 at 8:44am
keeping this a usable cab my only thoughts are neo...

The BnC 18nw100 and  RCF 18LF N401 only have 9mm xmax - what does this tell you...



edit: 1200watt / 4 ohm

In the real world with a XLim of 52mm how far can you push the driver? Even with porting you are seeing over excusion at the sweet spot - about 13.5mm??


Edited by tomschute - 12 September 2009 at 9:02am
Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk
Speaker Building Services
Back to Top
pfly View Drop Down
Old Croc
Old Croc


Joined: 25 October 2007
Location: Helsinki, Fin
Status: Offline
Points: 2828
Post Options Post Options   Thanks (0) Thanks(0)   Quote pfly Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2009 at 9:28am
I've been fooling around with porting 1850 horn. Turns out, small port for example backwards in access panel should help control excursion in a way that with 1000W driven into V18-1000, excursion goes over Xmax somewhere around 25-30hz instead of 40-45hz. It adds some 5ms to group delay though and won't go any lower.

Edited by pfly - 12 September 2009 at 9:28am
Back to Top
tomschute View Drop Down
Old Croc
Old Croc


Joined: 15 May 2006
Location: Mid Wales
Status: Offline
Points: 1817
Post Options Post Options   Thanks (0) Thanks(0)   Quote tomschute Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2009 at 11:43am
Originally posted by pfly pfly wrote:

I've been fooling around with porting 1850 horn. Turns out, small port for example backwards in access panel should help control excursion in a way that with 1000W driven into V18-1000, excursion goes over Xmax somewhere around 25-30hz instead of 40-45hz. It adds some 5ms to group delay though and won't go any lower.


indeed but not the case here:



Could someone explain the deal. How far over xmax is safe? I know unless you're putting a perfect sine wave through you're never going to reach true max excusion anyhow. But would be a costly test to try....
Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk
Speaker Building Services
Back to Top
Amano View Drop Down
Registered User
Registered User


Joined: 06 October 2008
Location: Russia
Status: Offline
Points: 219
Post Options Post Options   Thanks (0) Thanks(0)   Quote Amano Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2009 at 2:38pm
Originally posted by tomschute tomschute wrote:

Originally posted by pfly pfly wrote:

I've been fooling around with porting 1850 horn. Turns out, small port for example backwards in access panel should help control excursion in a way that with 1000W driven into V18-1000, excursion goes over Xmax somewhere around 25-30hz instead of 40-45hz. It adds some 5ms to group delay though and won't go any lower.


indeed but not the case here:



Could someone explain the deal. How far over xmax is safe? I know unless you're putting a perfect sine wave through you're never going to reach true max excusion anyhow. But would be a costly test to try....

seems very nice for 18NLW9600!
Back to Top
levyte357 View Drop Down
The 10,000 Points Club
The 10,000 Points Club


Joined: 10 May 2004
Location: UK, London
Status: Offline
Points: 11738
Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357 Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2009 at 5:52pm
Originally posted by levyte357 levyte357 wrote:

Originally posted by Amano Amano wrote:

I am amazed by loudness of a SINGLE cab... it was louder than WSX.


Please tell me single cab will do 35-100hz @ 103db average, without corner loading. Embarrassed


Shocked

"Who am I? I'm the guy who does his job.. You must be the other guy".
Back to Top
mykey View Drop Down
Old Croc
Old Croc


Joined: 18 August 2005
Location: UK/Indonesia
Status: Offline
Points: 9680
Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2009 at 5:52pm
I would stop looking at graphs and be more concerned about the throat to mouth PASSAGE, that messy fold after the throat area doesn't look to good
 
if you want to see a perfect example of a throat exit to horn, look at Minimaxils Terra horn, SMOOTH as a bar of galaxy chocolate
 
Back to Top
levyte357 View Drop Down
The 10,000 Points Club
The 10,000 Points Club


Joined: 10 May 2004
Location: UK, London
Status: Offline
Points: 11738
Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357 Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2009 at 6:15pm
Originally posted by mykey mykey wrote:

I would stop looking at graphs and be more concerned about the throat to mouth PASSAGE, that messy fold after the throat area doesn't look to good


Anything constructive, to follow that criticism...  Embarrassed
"Who am I? I'm the guy who does his job.. You must be the other guy".
Back to Top
 Post Reply Post Reply Page  <1 910111213 22>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.094 seconds.