Please explain: RCA active filter / crossover on sub - Home Theater Forum and Systems - HomeTheaterShack.com
 1Likes
  • 1 Post By ajinfla
 
Thread Tools
post #1 of 5 Old 01-15-19, 03:04 PM Thread Starter
Shackster
 
Join Date: Apr 2018
Posts: 7
Please explain: RCA active filter / crossover on sub

I’m looking for a sub that has left and right RCA in and out, and further that acts as an active crossover (thus not sending the bass that the subwoofer is handling to the main speaker amps).

The reason for this is that I have a great stereo pre-amp with only one pair left and right RCA outputs. I would like to buy small but high quality monitor type speakers and leave them free from the struggle of producing lots of bass (as the rest of the range IMHO suffers).

I am not clear on the terms used to describe the above. For example I see many KEF PSW 2010’s for sale 2nd hand. They have a pair of RCA in and a pair out. The pair out is labelled “high pass output”. Does that mean it is only passing out the frequency above what the subwoofer is handling?

My system is a Meridian Director DAC ->Prime / PSU pre-amp -> four Musical Fidelity X-A50 monoblocks (bi-amping)

I’d like it to be Meridian Director DAC ->Prime / PSU pre-amp -> **Sub Woofer with Active Crossover** -> four Musical Fidelity X-A50 monoblocks (bi-amping)

Appreciate most subs in home theater will use an active crossover in the AV amp (that doesn’t exist in my arrangement).

Any help from you smart folks greatly appreciated:-)



Sent from my iPhone using Tapatalk
david.faik is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 01-15-19, 08:38 PM
HTS Moderator
 
ajinfla's Avatar
AJ
 
Join Date: May 2009
Location: Tampa FL
Posts: 1,661
My System
Re: Please explain: RCA active filter / crossover on sub

Quote:
david.faik wrote: View Post
I’m looking for a sub that has left and right RCA in and out, and further that acts as an active crossover (thus not sending the bass that the subwoofer is handling to the main speaker amps).

I am not clear on the terms used to describe the above. For example I see many KEF PSW 2010’s for sale 2nd hand. They have a pair of RCA in and a pair out. The pair out is labelled “high pass output”. Does that mean it is only passing out the frequency above what the subwoofer is handling?
Yes, that is exactly what "Hi pass" means, so this or other similar subs with high pass out is what you desire.
So preamp > sub input, then "hipass out" > amp driving main speakers. One possible drawback is the KEFs highpass seems fixed, say 100hz etc.
That might either be too high or low. So the options are to find a sub with a variable high pass frequency (rare), or choose the high pass yourself, with an inline filter such as these https://www.parts-express.com/cat/in...%5D&PortalID=1
So if your mains are comfortable down to 50hz, select a 50hz filter. Or 70. Or 100, etc.
The lower the main can go (without distortion on heavy bass passages), the easier it will be to blend with the sub.
david.faik likes this.

AJ

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
ajinfla is offline  
post #3 of 5 Old 01-16-19, 02:59 AM Thread Starter
Shackster
 
Join Date: Apr 2018
Posts: 7
Re: Please explain: RCA active filter / crossover on sub

Brilliant, so “hi pass” out is what I’m after.

These KEF subs have dials to control the “cut off” frequency and two “slope” options, so was wondering where you saw that the hi pass was fixed at 100hz?

Having found a manual it describes the outputs as “actively filtered @ 12db/octave @ 130Hz” ... so I am guessing this is the fixed part and the cutoff isn’t linked?

As speakers give their range to +/- 3db and not flat, I am guessing if the main speakers state down to 50 or 60Hz that should be about right?

Getting there I think LOL




Sent from my iPhone using Tapatalk
david.faik is offline  
 
post #4 of 5 Old 01-23-19, 08:13 PM
Shackster
RLouis
 
Join Date: Jan 2010
Location: Reston, VA
Posts: 39
Re: Please explain: RCA active filter / crossover on sub

Instead of looking for a subwoofer with a line level high pass built in you'd be better off looking for an actual "stand-alone" active crossover then just run the low pass out to the sub. Then you can run ANY sub you'd like or even switch subs easily. And, a stand alone active crossover will give you many more tuning functions and more flexibility than a simple built-in. Example:Behringer Super-X Pro

Canton Ergo RC-L's and 609's with custom crossovers, Cinepro 1k2SE and 3k6III amps, Marantz AV7704 Pre/Pro, Sony XBR65-X930E
RLouis is offline  
post #5 of 5 Old 01-30-19, 10:31 PM
Elite Shackster
 
RTS100x5's Avatar
RTS100x5
 
Join Date: Sep 2009
Location: Plano, Tx.
Posts: 1,208
Re: Please explain: RCA active filter / crossover on sub

Quote:
RLouis wrote: View Post
Instead of looking for a subwoofer with a line level high pass built in you'd be better off looking for an actual "stand-alone" active crossover then just run the low pass out to the sub. Then you can run ANY sub you'd like or even switch subs easily. And, a stand alone active crossover will give you many more tuning functions and more flexibility than a simple built-in. Example:Behringer Super-X Pro
https://www.minidsp.com/products/min...minidsp-2x4-hd
RTS100x5 is offline  
Reply

Bookmarks

Tags
active , crossover , explain , filter , rca

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