DIY Infinity Kappa Perfect 12 w/ EQ and XO - Home Theater Forum and Systems - HomeTheaterShack.com

 
Thread Tools
post #1 of 4 Old 07-16-06, 02:39 PM Thread Starter
Elite Shackster
 
Ilkka's Avatar
Ilkka
 
Join Date: Jun 2006
Location: Finland
Posts: 1,468
DIY Infinity Kappa Perfect 12 w/ EQ and XO

Manufacturer: DIY
Provided by: Torkkis
Manufacturer link: -
Price: ~950 EUR

Manufacturer specs:
Enclosure: Sealed, 50 litres, 35 mm real birch, e-mail to enclosure maker: [email protected], pictures
Woofer: Infinity Kappa Perfect 12.1
Amplifier: NAD 214 (~300 W into 8 Ohm, bridged)
DIY external crossover/EQ: 25-70 Hz 24 dB/oct, +0-9 dB @ 18 Hz

Configuration as tested:
Orientation: Standard down-firing
Crossover/EQ: ~40 Hz, +6 dB boost @ 18 Hz

Ilkka is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 07-17-06, 10:06 AM Thread Starter
Elite Shackster
 
Ilkka's Avatar
Ilkka
 
Join Date: Jun 2006
Location: Finland
Posts: 1,468


+/- 3 dB points: 16 Hz - 50 Hz
Ilkka is offline  
post #3 of 4 Old 07-17-06, 10:06 AM Thread Starter
Elite Shackster
 
Ilkka's Avatar
Ilkka
 
Join Date: Jun 2006
Location: Finland
Posts: 1,468
















Ilkka is offline  
 
post #4 of 4 Old 07-17-06, 02:29 PM Thread Starter
Elite Shackster
 
Ilkka's Avatar
Ilkka
 
Join Date: Jun 2006
Location: Finland
Posts: 1,468
This was the same sub as this one, except that now we were using a 40 Hz low pass filter and ~6 dB low-Q boost at 18 Hz. This represents a more typical configuration during normal use. Naturally the shape of the frequency response changes due these electronic alterations. The highs get cut off while the lows are boosted. A 6 dB boost requires 4 times amp power, and unfortunately the 300 W NAD couldn’t quite handle it. Also the driver itself was reaching its maximum excursion at low frequencies. THD skyrockets below 30-35 Hz so that the higher harmonics went above the amplitude of the fundamental, hence the small undulation in 50-100 Hz range (90 dB and 95 dB sweeps). THD stays really low above 30-35 Hz because of the low pass filtering. Group delay shifts up above ~60 Hz due to low pass filtering, but it’s still reasonably low. There’s a little bit of added overhang in the spectral decay graph. Spectral contamination test shows quite a lot of distortion already at low test level, indicating that the driver nor the amp can not handle very high output levels with these settings. Something which we all should remember while applying a lot of boost at any frequency.

+ Good extension
+ Low group delay

- Extremely high deep bass distortion
- Low maximum output capability
Ilkka is offline  
 

Bookmarks

Tags
12 , diy , eq , infinity , kappa , perfect , w or , xo

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

 


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