Newbie Help - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th August 2008, 11:21 AM   #1
makksus is offline makksus  United Kingdom
diyAudio Member
 
Join Date: Aug 2008
Talking Newbie Help

hey everyone,

im new to this audio and generally speaker DIY in general. Im a dj and producer and wanted to start diying. Ive been reading up and read vance dickson's book and have some questions..

all of my questions are for the following driver:
p.Audio challenger series c12-300mb
diameter= 312cm
P(rms)= 300
sensitivity= 98
range= 35-3200
fs=50hz
re=5.4
Sd=.543m^2
Qms=4.99
Qes=.27
Qts=.26
Vas=79.41 litres
MMs=52.36 gr
xmax=3.5mm
xmax peak=12mm


i will be using a vented enclosure.

- when talking about alignments i don't . I've got different values for differently alignments, but i don't know which means there best eg. Fb for SBB4 is the same as the driver, is this good? Vb is 23 litres. What is the comparison. I.E. what numbers am i looking for to say," yes this is the alignment im gunna use"?

-becaus the size of my driver most calculators (including LDC7) will give me these box dimensions 29.5 x 47.8 x 18.23 (cm) but that wont fit the driver, and if i change it to fit the driver, won't i have changed the alignment?

-I have a computer (Mac) and a sound card and an amp, is this enough to test the speaker. and find the SPL graph?

-Crossover:both my mid and bass Have the same frequency range, to maximize output would it be feesable to actually design a 2 way xover and just make two similar branches for both oF them. In the absence of this i have designed a 3-way crossover that is fairly simple it is a first order one because there are no significant dips or peaks in any of the responses (apart from a dip of a couple of db at 2khz for the bass but it wont get that far i've concluded) the tweeter has a series notch filter and an L-pad
the mid has a zobel circuit and a l-pad and so does the bass. is there anything i havnt considered? i have not considered the box in anyway while designing this crossover. should i have? and how will it have affected my design?

I have a background in engineering and know some(not alot) about analog electronics.

If you've gotten this far i thank you for reading this. any help would much apprecated.

thanks again
Makks
  Reply With Quote
Old 11th August 2008, 11:36 AM   #2
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
The alignment just comes down to personal taste and how you want the speaker to be used.

As long as you don't go mad with dimensions (direct multiples or long thin etc) , then it's only the volume that matters, so design your box to suit the speaker physical size and vent physical size.

Bit unsure what you mean about the mid and woofer having the same frequency range. If you are going to use this speaker for sound reinforcement then you won't get away with 1st order crossovers as they will allow too much out of band signal through which coupled with you playing at max will blow the drivers.

Ideally you should consider the box during crossover design to think about baffle step.

If you want to test frequency response and SPL you will need a calibrated mic.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 11th August 2008, 07:40 PM   #3
makksus is offline makksus  United Kingdom
diyAudio Member
 
Join Date: Aug 2008
thanks for the quick and helpful reply,

so a higher level crossover to get them band off. What is baffle step? and how does it affect my crossover?

and i do have a mic, can u recommend any software for this?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
newbie Q memphissound Multi-Way 7 17th August 2006 11:36 AM
Yet another newbie hell0un1verse Introductions 1 30th March 2006 05:31 PM
Newbie w/ sub ?'s toenail Multi-Way 2 8th March 2003 01:10 PM
Newbie needs serious sub help AcidRain Multi-Way 4 7th March 2003 07:07 PM
newbie post, but hopefully not a newbie question wiredcur Solid State 3 24th August 2002 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 10:12 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2