OB Project Design Started, Help Requested. - Page 13 - 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 17th October 2010, 09:12 AM   #121
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Quote:
Originally Posted by jwmbro View Post
There are other options as well, such as crossing over in software via PC, using an external multi-channel sound interface.

I personally am going to build a 2-way open baffle system using a MiniDSP board and an amp I already have. Only thing left to do is buy a second stereo amp for the woofer channel. On the upside: no impedance measuremnts to do, no coils and caps to buy, (almost) no soldering, and as an added bonus I can do digital room correction, dipole roll-off equalisation, linkwitz transform, etc. With that amount of correction available, most TS-Parameters become "obsolete", pretty near all you need is Sd and Xmax for bass.
If you go the PC route, do you need to have it connected to the PC & PC running whilst playing music?

I love soldering.

I wouldn't mind to build some amps as long as there a fairly easy build, you know, join the dot's.

Doesn't all of this complex circuitry degrade the sound?

Once the digital signals are broken up into the seperate frequencies, you would then need to do DA conversion, which means 6 DA converters etc
  Reply With Quote
Old 17th October 2010, 09:17 AM   #122
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Quote:
Originally Posted by ScottG View Post
wait a minute.. you never mentioned budget before..

The AE drivers shouldn't be more expensive than the BMS drivers you were looking at. (..which btw, others have reported as being considerably less efficient than stated on their website.)

If you want something simple.. well, you are looking at the wrong design. A good dipole design isn't going to be truly simple, and a passive implementation will significantly increase complexity.

Suggestion: Do what I did for one of my designs.. just get some midbass drivers that are suitable with a bit of resistance from a large cored inductor (in series with the two paralleled drivers), and don't worry about lower freq.s.. Here are some:

Dayton PA255-8 10" Pro Woofer | Parts-Express.com
Ah yes, theres always a budget, the BMS drivers turned out to be more than I have been lead to believe by false advertising. Unless a bundle of money falls in my lap, 4 drivers that expensive wont be on the list.

I think I am hooked & convinced that I will probably need to be active, I dont want to make things difficult for myself

Think, that way I can build the speakers & the amps, fun ,fun, fun
  Reply With Quote
Old 17th October 2010, 09:57 AM   #123
Helmuth is offline Helmuth  Netherlands
diyAudio Member
 
Helmuth's Avatar
 
Join Date: Oct 2008
Location: Winterswijk
Quote:
Originally Posted by DQ828 View Post
Ah yes, theres always a budget, the BMS drivers turned out to be more than I have been lead to believe by false advertising. Unless a bundle of money falls in my lap, 4 drivers that expensive wont be on the list.

I think I am hooked & convinced that I will probably need to be active, I dont want to make things difficult for myself

Think, that way I can build the speakers & the amps, fun ,fun, fun
There are a lot of amp-modules discussed here that is with a bit soldering easy to do. Or like I do with class-d modules they are more expensive then a module.

Or search the second hand market for some qaulity low price amplifiers pioneer or so, with source direct switch.

Or just buy new yamaha ax 397 95W 4ohm (australian market is exspensive i see in netherlands the ax397 cost only 232 australian dollar).
Click the image to open in full size.
yammi Yamaha Music Australia - Audio Visual - Hi-Fi Components - AX-397 and AX-497

Prices uk http://www.pricerunner.co.uk/sp/yamaha-ax-397.html
__________________
( (( KUGELWELLE )) )
recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

Last edited by Helmuth; 17th October 2010 at 10:03 AM.
  Reply With Quote
Old 17th October 2010, 10:17 AM   #124
Helmuth is offline Helmuth  Netherlands
diyAudio Member
 
Helmuth's Avatar
 
Join Date: Oct 2008
Location: Winterswijk
It look promising this driver high Q for pa with fs 55Hz I would like to simulate these two in series, only poor data.

12-Inch Paper Cone PA Driver - Jaycar Electronics
Click the image to open in full size.


Back to back and make a dipole.
Click the image to open in full size.
http://www.jaycar.com.au/productView...T&SUBCATID=645

Click the image to open in full size.

http://www.jaycar.com.au/productView...T&SUBCATID=557
__________________
( (( KUGELWELLE )) )
recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

Last edited by Helmuth; 17th October 2010 at 10:43 AM.
  Reply With Quote
Old 17th October 2010, 06:21 PM   #125
6.283 is offline 6.283  Germany
diyAudio Member
 
Join Date: Aug 2008
Location: Black Forest
Quote:
Originally Posted by DQ828 View Post
Doesn't all of this complex circuitry degrade the sound?
Today's DSP modules are normally of useful quality. But even if it feels bad today you will very soon forget about it when you are listening to a pair constant/controlled directivity speakers, one of which a decently executed OB speaker is.
__________________
2Pi-online.de
  Reply With Quote
Old 17th October 2010, 11:06 PM   #126
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Quote:
Originally Posted by Helmuth View Post
There are a lot of amp-modules discussed here that is with a bit soldering easy to do. Or like I do with class-d modules they are more expensive then a module.

Or search the second hand market for some qaulity low price amplifiers pioneer or so, with source direct switch.

Or just buy new yamaha ax 397 95W 4ohm (australian market is exspensive i see in netherlands the ax397 cost only 232 australian dollar).

yammi Yamaha Music Australia - Audio Visual - Hi-Fi Components - AX-397 and AX-497

Prices uk http://www.pricerunner.co.uk/sp/yamaha-ax-397.html
Yes you are right the Australian market is expensive, small population & a long way to bring goods I guess.

I have a 7:1 AV reciever that has enough channels, I wonder if that could be used somehow? The movie makers manange to get different sound coming out of different speakers.
  Reply With Quote
Old 17th October 2010, 11:50 PM   #127
Rudolf is offline Rudolf  Germany
diyAudio Member
 
Rudolf's Avatar
 
Join Date: Mar 2003
Location: Germany
Quote:
Originally Posted by DQ828 View Post
I have a 7:1 AV reciever that has enough channels, I wonder if that could be used somehow? The movie makers manange to get different sound coming out of different speakers.
You can't use the sound control features of the AV receiver. But if it features a DVD multichannel input, you can use the 6 built-in amplifiers at your will and get a 6 channel volume control for free - just where it works best.

Rudolf
__________________
www.dipolplus.de
  Reply With Quote
Old 18th October 2010, 04:14 AM   #128
diyAudio Member
 
Join Date: Jun 2009
Quote:
Originally Posted by DQ828 View Post
If you know of any hi efficieny, 12" drives with a Qts of about 0.7 & a xmax of 6+ let me know, all suggestions are welcome.
Efficency and xmax tend to be inversely correlated so you'll have a hard time with that. Beyma 12G40 could be worth a look but, like the 12PW5, its Fs is on the high side and modifying the spider is probably more than you want to get into here.
  Reply With Quote
Old 18th October 2010, 04:48 AM   #129
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Quote:
Originally Posted by Rudolf View Post
You can't use the sound control features of the AV receiver. But if it features a DVD multichannel input, you can use the 6 built-in amplifiers at your will and get a 6 channel volume control for free - just where it works best.

Rudolf
Is this the sort of input you where thinking of? If it is what would I use, to get the signal split up into its component frequencies.

This is getting exciting
Attached Images
File Type: jpg Reciever Back Panel.JPG (172.5 KB, 215 views)
File Type: jpg Reviever Instructions.JPG (29.3 KB, 59 views)
  Reply With Quote
Old 18th October 2010, 09:17 AM   #130
Rudolf is offline Rudolf  Germany
diyAudio Member
 
Rudolf's Avatar
 
Join Date: Mar 2003
Location: Germany
Quote:
Originally Posted by DQ828 View Post
Is this the sort of input you where thinking of? If it is what would I use, to get the signal split up into its component frequencies.
Yes, exactly. It looks suspiciously like my own Onkyo receiver . Behind the input you get a 6 channel volume control and the option to give each channel an individual attenuation. And 6 amplifiers of course.

The means for splitting up the frequencies are multiple: A PC with a 7.1 soundcard, a DBX driverack, Alto maxidrive, Behringer DCX2496 or some miniDSP boards.
__________________
www.dipolplus.de
  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
S11 OB - Revisiting Desktop OB design using Seas 8" and Tang Band Full-Range gainphile Multi-Way 27 23rd January 2013 09:51 PM
New open source loudspeaker design program project started Karoliina Multi-Way 33 10th December 2009 10:18 AM
I've started my first project... Bigun Full Range 38 8th February 2009 01:15 AM
A roast requested on my TQWT design Christof Multi-Way 9 29th March 2004 05:57 PM


New To Site? Need Help?

All times are GMT. The time now is 11:53 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