Crossovers - where to start? - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #31 of 157 Old 01-04-13, 05:58 PM
Elite Shackster
 
robbo266317's Avatar
bigbadbill
 
Join Date: Sep 2008
Location: Newcastle Australia
Posts: 5,771
Re: Crossovers - where to start?

Quote:
Odougbo wrote: View Post
The woofer is not going down without a fight - which I expected. I.e. it is competing with the Tweeter above 2200hz. (4,000 I can't hear the woofer at all)

I could order new tweeters...just so many out there. Maybe one closer to 89db - 90db.
Do you have access to a SPL meter or REW?

REW makes it easy to measure the difference in levels between the two drivers, then just calculate the value needed for the L Pad circuit.

Silence is golden but duct tape is silver.

DIY completed:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
robbo266317 is offline  
Sponsored Links
Advertisement
 
post #32 of 157 Old 01-04-13, 06:17 PM Thread Starter
Senior Shackster
Odougbo
 
Join Date: Oct 2011
Location: Maryland USA
Posts: 205
Re: Crossovers - where to start?

Lent my SPL to a buddy - few years later he showed me his meter

Friends NEVER LEND TOOLS - NEVER LEND TOOLS WITHOUT YOUR NAME...

I'm sure I can pad the tweeter down, this is not Odougbo's first rodeo

I think - - - I need help with xo point and/or phase issues.

The Morel are known for mid range, it has 1,500 printed right on the back. I wouldn't mind trying something new.

[/SIGPIC]
Odougbo is offline  
post #33 of 157 Old 01-05-13, 01:58 AM Thread Starter
Senior Shackster
Odougbo
 
Join Date: Oct 2011
Location: Maryland USA
Posts: 205
Re: Crossovers - where to start?

Attached Thumbnails
Crossovers - where to start?-555.jpg  


[/SIGPIC]

Last edited by Odougbo; 01-05-13 at 02:07 AM.
Odougbo is offline  
 
post #34 of 157 Old 01-05-13, 03:45 AM
Elite Shackster
 
robbo266317's Avatar
bigbadbill
 
Join Date: Sep 2008
Location: Newcastle Australia
Posts: 5,771
Re: Crossovers - where to start?

That looks pretty good frequency wise.

It looks like it is tuned to 65 Hz. The rise in impedance at that point is typical for a tuned enclosure.
You could add a Zobel network to reduce the impedance at the top end although it is not excessive.

Silence is golden but duct tape is silver.

DIY completed:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
robbo266317 is offline  
post #35 of 157 Old 01-05-13, 06:18 AM Thread Starter
Senior Shackster
Odougbo
 
Join Date: Oct 2011
Location: Maryland USA
Posts: 205
Re: Crossovers - where to start?

I checked the woofer xo with clip lead (shunt) it does seem to work around 2,000+

The one morel had a buzz (which is not uncommon) - I had one left, that was clearer.

[/SIGPIC]
Odougbo is offline  
post #36 of 157 Old 01-05-13, 06:24 AM Thread Starter
Senior Shackster
Odougbo
 
Join Date: Oct 2011
Location: Maryland USA
Posts: 205
Re: Crossovers - where to start?

Cool inside Pic
Attachments

[/SIGPIC]
Odougbo is offline  
post #37 of 157 Old 01-06-13, 01:31 AM Thread Starter
Senior Shackster
Odougbo
 
Join Date: Oct 2011
Location: Maryland USA
Posts: 205
Re: Crossovers - where to start?

There's some kind of overlap problem - the tweeter might just be going too low. In desperation I used a 6db L-pad which sounded best of all - but cymbals are starting to fade away.

I.e. the mid range is way too However the bass is really kicking!!!!

Trial & Error - maybe switch to bigger coil (1mH) and/or smaller cap.

[/SIGPIC]

Last edited by Odougbo; 01-06-13 at 01:44 AM.
Odougbo is offline  
post #38 of 157 Old 01-06-13, 03:09 AM
Elite Shackster
 
robbo266317's Avatar
bigbadbill
 
Join Date: Sep 2008
Location: Newcastle Australia
Posts: 5,771
Re: Crossovers - where to start?

The butterworth design has a slight rise at the crossover point. This could be causing your issues.
(Again, access to REW would confirm this. You could replace each speaker with an 8Ω resistor and then combine the two graphs.)

Alternatively, If you have the resources, a Linkwitz-Riley configuration is flat across the crossover region.

eg

Silence is golden but duct tape is silver.

DIY completed:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
robbo266317 is offline  
post #39 of 157 Old 01-06-13, 04:27 AM Thread Starter
Senior Shackster
Odougbo
 
Join Date: Oct 2011
Location: Maryland USA
Posts: 205
Re: Crossovers - where to start?

Aye - just what I envisioned 4.uF and 1.15mH (x2)

This has been a lot of work but a good learning exercise.

This is much better...whew.
Attached Thumbnails
Crossovers - where to start?-linkrily.jpg  


[/SIGPIC]

Last edited by Odougbo; 01-06-13 at 07:28 AM.
Odougbo is offline  
post #40 of 157 Old 01-06-13, 04:35 AM Thread Starter
Senior Shackster
Odougbo
 
Join Date: Oct 2011
Location: Maryland USA
Posts: 205
Re: Crossovers - where to start?

Removed.

[/SIGPIC]

Last edited by Odougbo; 01-06-13 at 11:14 AM.
Odougbo is offline  
Reply

Bookmarks

Tags
crossovers , start

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome