Speakerplans.com Homepage
Forum Home Forum Home > Plans > Scoops
  New Posts New Posts RSS Feed - Sound System OHM's query
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Sound System OHM's query
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
skyrockhifi View Drop Down
Registered User
Registered User


Joined: 21 October 2006
Status: Offline
Points: 29 		Post Options Post Options   Thanks (0) Thanks(0)   Quote skyrockhifi Quote  Post ReplyReply Direct Link To This Post Topic: Sound System OHM's query
    Posted: 21 October 2007 at 1:23pm

Reggae sounds like Iration Steppas and Abashanti sometimes use 4 scoops on each side.

Does this mean theyre running these at 1ohm?
 
My understanding is that the first scoop would be 8ohm's then into the next would make it 4ohm's and into the next would be 2ohm's and finally into the forth would make it 1ohm!!
 
Is this correct or do they change the curcuit on the last scoop (parallel/series??) to take it back up from 2ohm's to 4ohm's???
 
Or am i just totally wrong alltogether???  Embarrassed
 
 
Back to Top
tweeter box View Drop Down
Old Croc
Old Croc


Joined: 21 October 2007
Location: United Kingdom
Status: Offline
Points: 6784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tweeter box Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2007 at 1:43pm
Allo mate Smile
 
i use 3 T18 copies (B&C loaded Wink) on each side of a VZ5000, that drops down to 2OHMS per side. Never really needed more so never really tried.
The sounds systems your talkin bout use amps like JTS or DESTRUCTOR which i didnt actually know dropped down to 1-OHM! If they do that is? It may be worth lookin up these amps on the net - i know JTS has a website but not to sure bout the other one.
 
THIS IS MY FIRST POST SO;
 
---- HELLO EVERYBODY Tongue ----
 
Interesting topic by the way!
Back to Top
TONY.A.S.S. View Drop Down
Old Croc
Old Croc


Joined: 21 February 2007
Location: United Kingdom
Status: Offline
Points: 6867 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TONY.A.S.S. Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2007 at 3:09pm
4 8 ohm speakers in parallel is 2 ohms. The only dodgy thing about this rating is that although speakers have an 8 ohm rating, it is common for them to dip to 7.5 ohms, so you would end up with less than 2 ohms. In horn cabs you can get away with it, because through compression, the impedence has alreay risen from the start. In a reflex cab you can only depend on net impedence.
http://www.facebook.com/tony.rossell.3
Back to Top
tweeter box View Drop Down
Old Croc
Old Croc


Joined: 21 October 2007
Location: United Kingdom
Status: Offline
Points: 6784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tweeter box Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2007 at 6:40pm
Originally posted by skyrockhifi skyrockhifi wrote:

My understanding is that the first scoop would be 8ohm's then into the next would make it 4ohm's and into the next would be 2ohm's and finally into the forth would make it 1ohm!!

 
 
Tony could you explain this further please coz i always thought as quoted above Confused
Back to Top
TONY.A.S.S. View Drop Down
Old Croc
Old Croc


Joined: 21 February 2007
Location: United Kingdom
Status: Offline
Points: 6867 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TONY.A.S.S. Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2007 at 8:36pm
Impedence and the number of cabinets have no relevence untill you take into account what impedence the speakers inside are. Start with 8. For 2- 8ohm cabs divide 8 by2=4 for 3- 8 ohm cabs divide 8 by 3=2.6666 for 4- 8 ohm cabs divide 8 by 4= 2 and so on. The same applies to all impedences For series wireing just reverse everything.
http://www.facebook.com/tony.rossell.3
Back to Top
Jhodas View Drop Down
Young Croc
Young Croc


Joined: 04 June 2007
Location: United Kingdom
Status: Offline
Points: 1244 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jhodas Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2007 at 12:36am
Apparently the JTS annihilator  can cope with 1 ohm (6 scoops) per side.
What you have to remember is that the lower the load you present to an amp the harder it has to work.

The formula for impedance in parallel is:

1/Rt = 1/R1 + 1/R2 + 1/R3 ... + 1/Rn

where Rt is the total impedance and R1-n are all your speakers.
If you're connecting in series you just add them all together.

Iration runs his scoops at 2ohms off a Void infinite 8. He has an annihilator but I haven't seen him use it.
Until the Lions have their own historians, tales of hunting will always glorify the hunter.
Back to Top
tweeter box View Drop Down
Old Croc
Old Croc


Joined: 21 October 2007
Location: United Kingdom
Status: Offline
Points: 6784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tweeter box Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2007 at 10:45am
Wow
 
ulot really know what your talking about!! Thanks for the education and i hope one day ill be able to give some advise or feedback in return  Smile
Back to Top
Jhodas View Drop Down
Young Croc
Young Croc


Joined: 04 June 2007
Location: United Kingdom
Status: Offline
Points: 1244 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jhodas Quote  Post ReplyReply Direct Link To This Post Posted: 23 October 2007 at 12:19am
Stick around. You'll be amazed what you learn.
I still am (amazed and learning)  Smile
Until the Lions have their own historians, tales of hunting will always glorify the hunter.
Back to Top
ToNy MoNtAnA View Drop Down
Registered User
Registered User
Avatar

Joined: 23 August 2007
Location: United Kingdom
Status: Offline
Points: 471 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2007 at 12:48am
Some drivers do come in 16 ohm versions as well though.
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.08
Copyright ©2001-2026 Web Wiz Ltd.