bookshelf speaker project advice - Page 3 - 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 13th April 2008, 11:00 PM   #21
ttan98 is offline ttan98  Australia
diyAudio Member
 
Join Date: Apr 2006
Location: Melb
Quote:
Originally posted by milen007



as i need the kit to ship to indonesia, buying from 1 source is my prefered option to save shipping.

Hi,

I am from Australia, I bought some Usher parts from a supplier in Indonesia!, mainly 8945A and 9950. you can get 9930(the lower model I think) as well.

This combo sounds very good as floor stand speakers as well.

If you are interested email me.
  Reply With Quote
Old 14th April 2008, 02:32 AM   #22
diyAudio Member
 
Join Date: Dec 2007
Quote:
Originally posted by Jay_WJ
You misunderstood me once again. My modified version of the Usher 701 kit does not require different drivers. It simply needs additional xover parts. Read more carefully:

http://www.geocities.com/woove99/Spkrbldg/Usher_701.htm
Hi Jay, thanks heaps, yeap i got the idea now, your modified crossover, thanks to the step by step explaination.
  Reply With Quote
Old 14th April 2008, 09:03 AM   #23
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

Subwoofers are still IMO your best choice.

The power amplifiers input capacitor should be resized to give a
1st order roll-off to the Spendors. Feed to the subwoofers is taken
from the amplifiers outputs and this should include an inverse 1st
order function to regain the attenuated bass levels.

/sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 14th April 2008, 12:39 PM   #24
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally posted by milen007

from your suggestion to add sub, the room sound boomy.
how bout adding supertweeter?

Click the image to open in full size.

Fig.5 Spendor S3/5, anechoic response on tweeter axis at 50",
averaged across 30 degrees horizontal window and corrected for
microphone response, with the individual responses of the tweeter
and woofer (red trace above 300Hz), and the nearfield response of
the woofer (red trace below 300Hz).

Hi,

Cannot see the point of a supertweeter for a 3/4" tweeter crossed at 4.5Khz.

A 1st order filter to the drive of the Spendors will reduce the tendency
for upper bass "boom", bringing in the subs lower than the roll-off should
not excacerbate bass boom. A further option for the subs is including a
notch filter(s) as your room is nearly square.

/sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 15th April 2008, 03:22 AM   #25
diyAudio Member
 
Join Date: Dec 2007
Hi Sreten
i am new to this, where can i learn more about 1st order roll off stuff? and how to accomplice driving the speaker with 1st order filter? thanks in advance
  Reply With Quote
Old 15th April 2008, 03:26 AM   #26
diyAudio Member
 
Join Date: Dec 2007
anyone happen to have the cabinet design for usher 701 that is front ported? thanks
  Reply With Quote
Old 15th April 2008, 05:04 AM   #27
TerryO is offline TerryO  United States
diyAudio Member
 
TerryO's Avatar
 
Join Date: Nov 2002
Location: Seattle,Wash.
I don't know if this is something you might be interested in, but the new Exodus Audio "Kepler" speaker kit has just had a review published by SoundStage! online audio magazine about two weeks ago. They also have the measurements done at the Canadian Nation Research Center. All in all it can be, IMHO, compared to just about any minimonitor there is and the price is pretty attractive.

Standard Disclaimer: Exodus Audio's Kevin Haskins and I are long-standing friends and while I have absolutely no connection with Exodus, I did play a part in the initial prototype of this speaker. Despite this obvious handicap, Kevin was able to overcome it and went on to produce a pretty nice product

Anyway here's the review:

http://www.soundstage.com/diwhy/diwhy.htm

Best Regards,
TerryO
__________________
"If you have to ask why, then you're probably on the right track."
quote from Terry Olson's DIYaudio Forum application
  Reply With Quote
Old 15th April 2008, 08:16 AM   #28
diyAudio Member
 
Join Date: Dec 2007
Terry, thanks for the suggestion
  Reply With Quote
Old 15th April 2008, 09:46 AM   #29
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally posted by milen007
Hi Sreten
i am new to this, where can i learn more about 1st order roll off stuff?
and how to accomplice driving the speaker with 1st order filter?
thanks in advance
Hi,

I'd suggest you find some one who can help you, the basics :

The input of the power amplifier has a 1st order high pass.
This can be changing the DC coupling capacitor or a network at the input.
It should be set by ear to get a clean response from the Spendors.

The high level subwoofer input should be modified to be the inverse
response of this filter, noting it should not do this down to DC
(which is impossible), but down to the cutoff point of the sub.
The subs high level input is fed from the amplifier output.

The normal controls of the sub are then set to integrate with
what is now the overdamped 3rd order roll-off of the Spendors.

There will be trade off between extending the dynamic range of
the Spendors (higher frequency filter) and good integration /
bass quality (lower frequency filter).

Have a read of :

http://www.vandersteen.com/pages/Pdf...%20Reprint.pdf

Note : I do not agree with everything in that article and specifically
the guff about a transient perfect crossover. The speakers high pass
will be overdamped third order, not 1st order. Multiple drivers are
not better than a single driver by default and performance / price
single drivers win easily.

/sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 20th June 2008, 04:35 PM   #30
diyAudio Member
 
Join Date: Dec 2007
just want to update this threat. i would like to thank Jay_WJ for all the superb and resourceful helps and suggestions on my 1st diy speaker project using usher 8945p and 9950. this is a very very very good sounding pair of speaker. in my system and with my ear and my own opinion, this pair of speaker beats my other speaker spendor s3/5 way ahead.

this pair throw huge soundstage, clarity and most importantly superb dynamic.

all the credit goes to Jay_WJ. thanks Jay
  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
looking for advice on a first speaker project farkus888 Multi-Way 10 25th April 2007 10:05 AM
Need help with choosing speaker driver for bookshelf project sumacSK Multi-Way 1 11th February 2007 04:54 PM
Advice For My Tired Bookshelf Speaker -- With Pics ted777ted Multi-Way 9 25th August 2005 06:15 PM
Need Advice for Speaker Project Tophet1 Multi-Way 2 11th August 2003 08:39 PM
Good bookshelf speaker project for newbie dlancep Multi-Way 1 10th January 2002 07:26 AM


New To Site? Need Help?

All times are GMT. The time now is 07:00 PM.


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