Amplifier for passive Klipsch KW120 THX Sub - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 17 Old 09-24-2013, 09:09 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
I did not get much answers on the Klipsch thread so I am trying my luck here with you folks:

I could get my hands on a 2nd hand Klipsch KW-120 subwoofer. I already got two in the front (running on Klipsch KA1000THX amp) and want to place one in the back.

What amplifier similar to the Klipsch KA1000THX (too expensive new) could I take? Would a Behringer EP4000 suffice? Other options?

FREQUENCY RESPONSE:20Hz-1kHz +0/-3dB
POWER HANDLING:FTC Rated Power: 500W into 8 ohms, 1000W into 4 ohms
AMPLIFIER:High-Efficiency Class D

http://www.klipsch.com/ka-1000-thx-a.../details#specs

Looking forward to hearing your thoughts.

TIA

XBL : neonima

PSN : NeoNima
Nima is offline  
Sponsored Links
Advertisement
 
post #2 of 17 Old 09-24-2013, 01:06 PM
AVS Special Member
 
Mrkazador's Avatar
 
Join Date: Jun 2005
Posts: 3,892
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
Liked: 267

The EP4000 seems like it would be a good match (450w @ 8ohms per channel) but you will need a highpass filter to protect the driver. There is the iNUKE 3000 with DSP that can do a 20hz highpass and from what I read, has similar performance to the EP4000.

Mrkazador is online now  
post #3 of 17 Old 09-25-2013, 01:27 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
I am using an AntiMode 8033 DSP which has a subsonic setting of 10Hz, would that suffice?

XBL : neonima

PSN : NeoNima
Nima is offline  
post #4 of 17 Old 09-25-2013, 02:16 AM
AVS Special Member
 
Mrkazador's Avatar
 
Join Date: Jun 2005
Posts: 3,892
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
Liked: 267
Mrkazador is online now  
post #5 of 17 Old 09-25-2013, 06:13 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
What about the Speakon cable adapter? They are from Monster and NL2 type. That should not be a problem for the Behringer should it?

XBL : neonima

PSN : NeoNima
Nima is offline  
post #6 of 17 Old 09-25-2013, 01:15 PM
AVS Special Member
 
Mrkazador's Avatar
 
Join Date: Jun 2005
Posts: 3,892
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
Liked: 267

NL2 will work for stereo but if you ever plan to use the iNUKE bridged then you need a 4 pole connector (NL4). 

Mrkazador is online now  
post #7 of 17 Old 09-25-2013, 01:35 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
LTD02 is offline  
post #8 of 17 Old 09-27-2013, 12:36 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
Thanks I have thought about the Dayton amp but it is limited with a high HPF of 20 Hz and its more expensive than a used EP4000.

XBL : neonima

PSN : NeoNima
Nima is offline  
post #9 of 17 Old 09-27-2013, 12:46 AM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
just a heads up...the sub is ported and has a modest driver in it. if you put an ep4000 on it with no high pass filter, the chance of you destroying the driver is high.

Listen. It's All Good.
LTD02 is offline  
post #10 of 17 Old 09-27-2013, 12:53 AM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
"I am using an AntiMode 8033 DSP which has a subsonic setting of 10Hz, would that suffice?"

looks like the tuning on that box is somewhere around 24hz or so, so a high pass filter at 22hz or so is about where you'd want it. a filter at 10hz will offer next to no protection for the driver in that subwoofer.

http://www.audioholics.com/soundbar-and-satellite-speaker-reviews/klipsch-thx-ultra2/page-5

Listen. It's All Good.
LTD02 is offline  
post #11 of 17 Old 09-27-2013, 02:43 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
I spoke with the German Klipsch sales agency and the technician told me that the Klipsch KA1000 amplifier did not have any HPF at all.

XBL : neonima

PSN : NeoNima
Nima is offline  
post #12 of 17 Old 09-27-2013, 02:57 AM
Member
 
KK20's Avatar
 
Join Date: May 2003
Posts: 125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
As an FYI, when wiring the KW120 sub, you only need to use the #1 (+/-) speakon connection terminals. The second pair on the connector goes no where in the sub as the driver is a simple +/- single pair.

This was confirmed by Klipsch and they had no explanation why there is an additional, unused pair. They supply 14/4 cable with the KA-1000 amp, KW-120 sub combination, you only need 14/2.

KK20
KK20 is offline  
post #13 of 17 Old 09-27-2013, 03:01 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
I am not sure I fully understand. Could I use the original cable which comes with the sub?

XBL : neonima

PSN : NeoNima
Nima is offline  
post #14 of 17 Old 09-27-2013, 03:10 AM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
he was mistaken and probably thought you were asking about a user configurable/settable/changeable high pass filter. not one that was built in. he probably looked at the manual. saw nothing and concluded it wasn't there.

but we can do better than that. the sub was measured here:

http://www.specsserver.com/cache/frwhscmswnbk.pdf

the subwoofer is tuned to around 25hz. the saddle in the impedance measurement confirms that.

ported roll off at 18-24db/octave or so below tuning depending on q.

from 20hz down to 10hz the rolloff is 50db. since that is one octave, the rolloff is 50db/octave. that means something other than the cabinet was rolling off the spl. that could only be a high pass filter. a second order high pass is about 12db/octave, so i would bet that there is *at least* a second order high pass filter built into that amp.

it would make sense from an engineering perspective and it is confirmed in the measurements.

Listen. It's All Good.
LTD02 is offline  
post #15 of 17 Old 09-27-2013, 03:19 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
Ok that makes sense, thanks for the PDF.

One question, would it harm the sub to have a PEQ raise at the tunning frquency? I have currently the "Lift25" function enabled on the AntiMode 8033 to extend the lowest output. It lifts 25hz for about 5db (measured with REW).

XBL : neonima

PSN : NeoNima
Nima is offline  
post #16 of 17 Old 09-27-2013, 04:02 AM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 16,852
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked: 1170
no problem.

eq does not matter. what matters is how much total power you put on the driver and the enclosure that it is in and how it is protected with a high pass filter.

each 3db is double power.

5 db gain is a little over 3 times power. so if 3 times power doesn't overshoot excursion, your fine. if it does, no good.

Listen. It's All Good.
LTD02 is offline  
post #17 of 17 Old 09-27-2013, 06:37 AM - Thread Starter
AVS Special Member
 
Nima's Avatar
 
Join Date: May 2001
Location: Germany
Posts: 1,202
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Liked: 90
Thanks. I think for now I will stay with my 2 KW120 I already have as they give me good SPL and output below 20hz. Once we move into a bigger house I will look into building 1-2 DIY subs. biggrin.gif

XBL : neonima

PSN : NeoNima
Nima is offline  
Reply DIY Speakers and Subs

Tags
Klipsch Kw 120 Thx Subwoofer

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


Forum Jump: 

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