Interesting EMF Audio article about gauss - Page 3 - Car Audio Classifieds
Car Audio Classifieds  

Go Back   Car Audio Classifieds > Car Audio Help & Discussion > Testing & Scientific Data Discussion

Testing & Scientific Data Discussion Results from Speaker and amplifier Testing


Notices

Reply
 
LinkBack Thread Tools Display Modes
  #21  
Old 05-16-2015, 11:41 AM
Lock up your daughters!
 
Activity Longevity
0/20 8/20
Today Posts
0/11 sssss1321
Location: Ames, Iowa
Thanks: 128
Thanked 101 Times in 88 Posts
iTrader: (7)
Feedback Score: 7 reviews
Default

Quote:
Originally Posted by tymoto21 View Post
Well look at the DDz super strong motor
Without tuning properly and wiring low impedance rise will kill any power you hoped to use
Iirc a guy by me tested his pair of 15's and had rise from 1 ohm to 8 ohm at his best score
If used properly can take gobs of power and get stupid loud
Yes, higher motor force equals higher rise.

I had my Z on a Banda 7k and took every bit of clean signal in a ported box.

I then had it on my M4a in a sealed box. Could not go full tilt on the amp before the sub was stressed. Rise in the sealed box was probably less.

What kind of power did he have his on?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #22  
Old 05-16-2015, 11:43 AM
mega fatty
 
Activity Longevity
4/20 19/20
Today Posts
1/11 sssss5924
Location: milwaukee, wi
Age: 27
Thanks: 261
Thanked 305 Times in 283 Posts
iTrader: (15)
Feedback Score: 15 reviews
Default

Iirc this is due to the motor design I will look for the thread
I couldn't find it but I think Jeff wrote some info about it


And it was like 7k for the pair
With a sealed box you will loose cone control the lower you play
My hcca was tuned to 32 and if I plugged the port good lord it would flex

Last edited by tymoto21; 05-16-2015 at 11:51 AM.
Reply With Quote Quick reply to this message
  #23  
Old 05-16-2015, 11:57 AM
Lock up your daughters!
 
Activity Longevity
0/20 8/20
Today Posts
0/11 sssss1321
Location: Ames, Iowa
Thanks: 128
Thanked 101 Times in 88 Posts
iTrader: (7)
Feedback Score: 7 reviews
Default

Yea, didn't like to play low in the sealed box, unfortunately.

Ported was awesome though
Reply With Quote Quick reply to this message
 
  #24  
Old 05-16-2015, 01:06 PM
Jeffhulbert50's Avatar
Authorized Vendor
 
Activity Longevity
6/20 12/20
Today Posts
2/11 ssss14101
Location: middle of east
Thanks: 65
Thanked 1,725 Times in 1,335 Posts
iTrader: (83)
Feedback Score: 83 reviews
Default

Quote:
Originally Posted by adulbrich View Post
what motor is on the sub that is your avatar?
b&c ipal
Reply With Quote Quick reply to this message
  #25  
Old 05-16-2015, 01:25 PM
Lock up your daughters!
 
Activity Longevity
0/20 8/20
Today Posts
0/11 sssss1321
Location: Ames, Iowa
Thanks: 128
Thanked 101 Times in 88 Posts
iTrader: (7)
Feedback Score: 7 reviews
Default

Quote:
Originally Posted by Jeffhulbert50 View Post
b&c ipal
Thanks! That motor looks delicious

Neo?
Reply With Quote Quick reply to this message
  #26  
Old 05-16-2015, 02:09 PM
Elite Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 sssss1085
Location: WY
Thanks: 51
Thanked 164 Times in 129 Posts
iTrader: (23)
Feedback Score: 23 reviews
Default

Quote:
Originally Posted by adulbrich View Post
Yes, higher motor force equals higher rise.
There are ways to combat the rise on powerful motors, but they are not common with the SPL crowd and they come with some compromises.

Thwarting back-emf by means of a pole sleeve or ferrofluid can drastically reduce the impedance peak. The compromise with the pole sleeve is a loss in motor force, and the compromise with ferrofluid is that it is not conducive to high excursion drivers and needs a lot of motor venting to be stable. However, in addition to the back-emf control of both of those options another benefit is they both help with cooling.

Alumapro Alchemy and the old school PPI pro flat piston subs are two that I can think of which come stock with ferrofluid in the gap and their impedance curves are shockingly flat right out of the box.
Reply With Quote Quick reply to this message
  #27  
Old 05-16-2015, 03:04 PM
Jeffhulbert50's Avatar
Authorized Vendor
 
Activity Longevity
6/20 12/20
Today Posts
2/11 ssss14101
Location: middle of east
Thanks: 65
Thanked 1,725 Times in 1,335 Posts
iTrader: (83)
Feedback Score: 83 reviews
Default

Quote:
Originally Posted by adulbrich View Post
Thanks! That motor looks delicious

Neo?
Radial neo
Reply With Quote Quick reply to this message
  #28  
Old 05-16-2015, 03:15 PM
Lock up your daughters!
 
Activity Longevity
0/20 8/20
Today Posts
0/11 sssss1321
Location: Ames, Iowa
Thanks: 128
Thanked 101 Times in 88 Posts
iTrader: (7)
Feedback Score: 7 reviews
Default

Quote:
Originally Posted by hurrication View Post
There are ways to combat the rise on powerful motors, but they are not common with the SPL crowd and they come with some compromises.

Thwarting back-emf by means of a pole sleeve or ferrofluid can drastically reduce the impedance peak. The compromise with the pole sleeve is a loss in motor force, and the compromise with ferrofluid is that it is not conducive to high excursion drivers and needs a lot of motor venting to be stable. However, in addition to the back-emf control of both of those options another benefit is they both help with cooling.

Alumapro Alchemy and the old school PPI pro flat piston subs are two that I can think of which come stock with ferrofluid in the gap and their impedance curves are shockingly flat right out of the box.
Would "supercharging" with a neo magnet on the pole piece or copper shorting rings affect rise in any way? I'd be interested in that if anyone can provide more info.

Interested in the pole sleeve like NS drivers have, but the ferrofluid sounds messy. Is that like liquid ferrite? Ferrite dissolved in a solvent? May google later, but I have to leave for work right now

Quote:
Originally Posted by Jeffhulbert50 View Post
Radial neo
Sweet
Reply With Quote Quick reply to this message
  #29  
Old 02-04-2017, 10:51 PM
Haelmuscle's Avatar
Elite Member
 
Activity Longevity
0/20 8/20
Today Posts
0/11 sssss1817
Location: Saudi Arabia
Thanks: 718
Thanked 150 Times in 141 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Hello Brothers,

My take here and it proves what Mr. Fuller is saying, for SPL you'd need low mass, the lower the mass the higher the sensitivity would be, and for SPL purposes you should look at sensitivity, for musical setups just look for something that sounds good, cuz you know the more sensitive the speaker is the bigger the box you need to play low...

Kindest Regards.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Tags
emf, force, gauss, motor, strength

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Car Audio Classifieds forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live
Level of Car Audio Knowledge
What's your level of car audio?

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Emf audio? jprophet123 General Car Audio Discussion & Questions 59 03-25-2015 10:24 PM
EMF audio YOLO line.... SINTORMAN General Car Audio Discussion & Questions 171 10-15-2014 10:04 AM
Very interesting home audio enclosure Boomintahoe General Home Audio/Video 3 06-10-2013 04:47 PM
What is this with sundownaudio? emf audio? etc.. Novicaine General Car Audio Discussion & Questions 177 05-28-2013 01:41 AM
Find whats wrong with this article headshok General Car Audio Discussion & Questions 29 07-13-2009 11:08 AM

» Amps
A/d/s/
Advent
Alphasonik
Alpine
American Bass
ARC Audio
Atomic
Audio Art
Audio Gods
Audiobahn
Audiocontrol
Audiopipe
Audison
Aura
Autotek
Avionixx
Bazooka
Beyma
Blaupunkt
Boss
Boston Acoustics
Bravox
Cadence
Cascade (CAE)
CDT Audio
Cerwin Vega
Clarion
Clif Designs
Concept
Coustic
Critical Mass
Crossfire
Crunch
DB Drive
DC Audio
DC Power
DEI
Denon
Diabolo
Diamond
Digital Designs
Directed
DLS
Dual
DYnamat
Dynaudio
Earthquake
Eclipse
Elemental Designs
ESX
Eton
Farenheit
Fi Car Audio
Fix My Speaker
Focal
Fusion
Genesis
Ground Zero
Hafler
Helix
Hertz
Hifonics
Hushmat
Image Dynamics
Infinity
Interfire
JBL
Jensen
JL Audio
JVC
Kenwood
Kicker
Knu Konceptz
Kole Audio
Kove Audio
Lanzar
Lightning Audio
Linear Power
MA Audio
Magnat
Marantz
Massive Audio
MB Quart
McIntosh
Memphis
Metra
MMATS
Mobile Authority
Morel
MTX
Nakamichi
Niche Audio
O2 Audio
Ohio Generator
Optima
Orion
Oxygen Audio
OZ Audio
PG Audio
Phase Linear
Phoenix Gold
Pioneer
Polk
Power Acoustik
Powerbass
Powermaster
Precision Power
Profile
Pyle
Pyramid
RadioShack
Rainbow
Rampage
RE AUdio
Rockford Fosgate
Scanspeak
Scosche
Seas
Sony
soundstream
Sparkomatic
SPL Dynamics
Stinger
Sundown Audio
Swiss Audio
Targa
TC Sounds
TREO Engineering
TRU
Tsunami
Ultimate
US Acoustics
US Amps
Velodyne
Vifa
Viper
Visonik
Xtant
Zapco
Zed Audio
Powered by vBadvanced CMPS v3.2.3
Links
Amp Guts
amplifier, amp guts, ampguts, car audio classifieds, speakers and subs for sale with listings of 12 volt sound systems. Security systems for sale for aftermarket car audio equipment with amplifier and amps for sale
Car Audio Forum
car audio forum, moble audio, car stereo, wholesale car audio, 12 volt, with, amplifier, amp, subwoofer, sound quality, buy car audio, and sell automotive stereo systems for cars
Car Audio Sound Quality Forum
Sound QUality science based car audio forum, amplifier, subs and speaker design, fabrication help, sound systems forum, aftermarket car audio website for sound quality.
Car Stereo Forum
DIYMA car audio stereo forum for 12 volt car audio subwoofer and amplifier systems that have sound quality with wholesale car audio products.


All times are GMT -5. The time now is 12:34 AM.


Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd. Guest