Speaker Asylum

General speaker questions for audio and home theater.

Return to Speaker Asylum

Message Sort: Post Order or Asylum Reverse Threaded

low and high pass settings for KEF LS50s

184.187.185.44
Posted on September 15, 2021 at 11:02:51
dbphd
Audiophile

Posts: 1674
Location: Montecito, CA
Joined: September 6, 2006
 I bought a KEF KC62 sub for use with LS50s. I intend to use its low and high-pass settings. Stereo from an Oppo 205 will go to the KC62; high-passed stereo from the KC62 will go to a NAD M22 amp that drives the LS50s. Any suggestions for low and high pass settings? LS50 bass is 3 dB down at 80 Hz, 6 dB at about 50.

 

Hide full thread outline!
    ...
RE: low and high pass settings for KEF LS50s, posted on September 15, 2021 at 12:01:48
PAR
Audiophile

Posts: 1732
Location: South London, UK
Joined: June 4, 2019
 As the room and where the subwoofer and main speakers are positioned within it will alter the resulting audible bass response of both due to room gain etc. there can be no fixed recommendation. If you know that the -6dB point for the main speakers is 50Hz that may be a good place to start but could well not be where you end up ( I am assuming that you have no means of measuring and are setting by ear).

"We need less, but better" - Dieter Rams

 

The KC62 is easy to set up by ear...., posted on September 15, 2021 at 13:29:19
Tromatic
Audiophile

Posts: 2760
Location: Portland
Joined: July 27, 2000
 Pick a location, listen, adjust. Repeat as required, get it where you like t he sound, forget about it. It is working great (replaced a REL) with LRS' and Wharfedale Lintons.

 

RE: low and high pass settings for KEF LS50s, posted on September 15, 2021 at 14:47:40
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 For my FIRST TEST? In no case? let the sub play about about 70hz.......at the crossover point.....

I'd low-CUT the KEFs about 60hz to 65hz.
I'd HIGH PASS the sub at about 50hz to 55hz. Sub has typically a built-in 24db octave crosover while I don't know about your low-cut........

Leave a GAP between LP and HP settings.....they are NOT a brick wall....
Too much is never enough

 

Agree, posted on September 15, 2021 at 16:18:31
E-Stat
Audiophile

Posts: 37649
Joined: May 12, 2000
Contributor
  Since: April 5, 2002
 I prefer taking even simple measurements using a Stereophile Test disc and SPL meter.

After much experimentation, I was surprised that the most linear results in the Schroeder frequencies with my HT system was setting the high pass at 90 hz for the Acoustat 1+1s and low pass to a pair of powered subs at 60 hz using 12 db/octave slopes. The 1+1s have considerable output below that frequency.

Room modes are fickle.

 

RE: low and high pass settings for KEF LS50s, posted on September 16, 2021 at 02:26:52
dbphd
Audiophile

Posts: 1674
Location: Montecito, CA
Joined: September 6, 2006
 PAR - I have a sound level meter that I use for matching speaker levels, but I usually use a Velodyne SMS-1 bass manager for setting up subs. It provides a graphic display with lots of parameters that can be adjusted. My KEF Reference 1s are high-passed at 80 Hz 24 dB by a Marchand balanced passive high-pass filter, and I may high-pass the LS50s at 80 Hz as well.

 

RE: low and high pass settings for KEF LS50s, posted on September 16, 2021 at 12:10:17
2-ears
Audiophile

Posts: 240
Location: Orange County, CA
Joined: January 19, 2003
 I had the powered version of the LS50s. I assume the drivers are the same. You should be okay with the Kefs to below 50Hz +/- 3dB. According to Kef, you should start with a high pass filter setting of 70Hz. The KC62s rolloff at 24dB per octave above the low pass filter setting. So start with a low pass setting of 40-45 Hz. Then tweak the settings to your liking.

 

RE: low and high pass settings for KEF LS50s, posted on September 17, 2021 at 10:51:55
dbphd
Audiophile

Posts: 1674
Location: Montecito, CA
Joined: September 6, 2006
 There seems to be a bit of consensus about low-passing LS50s at 45 Hz and high-passing them at 70 Hz, values that seems to have been generated by KEF's chief audio tech. I'll start with those values. OTOH, I preferred the sound when I raised low-pass from 40 to 80 Hz for my KEF Reference 1s, but that was before I installed the Marchand passive high-pass that's fixed at 80 Hz 24 db slope.

 

Page processed in 0.025 seconds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]