Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Linkwitz-Riley 12 db line level calculation
Linkwitz-Riley 12 db line level calculation
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th March 2018, 07:51 PM   #21
MarcelvdG is offline MarcelvdG  Netherlands
diyAudio Member
 
Join Date: Mar 2003
Location: Haarlem, the Netherlands
Quote:
Originally Posted by scott68 View Post
Oh, didn't explain myself completely - I meant not C1 or C2 but the numbers below them 1 and 2?
Probably pin numbers, some schematic drawing programs assign pin numbers to all components. Please ignore them.
  Reply With Quote
Old 19th March 2018, 08:00 PM   #22
MarcelvdG is offline MarcelvdG  Netherlands
diyAudio Member
 
Join Date: Mar 2003
Location: Haarlem, the Netherlands
Quote:
Originally Posted by scott68 View Post
No I don't play church music or synthesizer at all.
The reason I asked is that I wonder how useful the 50 Hz high-pass will be. Due to the constraint that it should only consist of Rs and Cs, it has a very smooth roll-off and only gives a good suppression at frequencies far below 50 Hz (a 50 Hz first-order high-pass is roughly at -7 dB at 25 Hz, -3 dB at 50 Hz and -1 dB at 100 Hz). Some typical sources of frequencies far below 50 Hz are church organs, synthesizers, warped records and audiophile live recordings made outside or in a place with a draft. Anyway, you can try and see.
  Reply With Quote
Old 19th March 2018, 08:48 PM   #23
scott68 is offline scott68  United States
diyAudio Member
 
Join Date: Nov 2016
I hadn't thought about that - I just assumed it would allow me to increase the volume without lower Hz causing problems- I'll try it anyway with a switch and see if it makes any perceivable difference above and below 50.


Which do you think would be the better approach to take a stereo signal and make a mono signal before your circuit as there seems to be several approaches that I have researched from the internet?
1. make "Y" with a 4.7k resistor on each arm before into the single leg.
Or 2. a suggested resistance of 10% of the amplifier input impedance which in my case would be anywhere from 1.3K to 3.6K
or 3. or 1k (headphone output ) to 5K (Line output).


On my full range (right channel) , if I want to lower the volume to match the woofer output, could I place a log/tapered pot after the mono resistors above and before your circuit. If so, what size, ie, 5k, 10K, 20 K or ?


Would another pot be able to vary the cutoff, ie from 100 to 200 hz vs your circuit 150 hz cutoff? If so , what size and where to place in your circuit?
Thanks
  Reply With Quote
Old 19th March 2018, 09:17 PM   #24
MarcelvdG is offline MarcelvdG  Netherlands
diyAudio Member
 
Join Date: Mar 2003
Location: Haarlem, the Netherlands
Quote:
Originally Posted by scott68 View Post
Which do you think would be the better approach to take a stereo signal and make a mono signal before your circuit as there seems to be several approaches that I have researched from the internet?
1. make "Y" with a 4.7k resistor on each arm before into the single leg.
Or 2. a suggested resistance of 10% of the amplifier input impedance which in my case would be anywhere from 1.3K to 3.6K
or 3. or 1k (headphone output ) to 5K (Line output).
None, because the stereo to mono conversion is already included in my circuit. In the schematic in post #14, the 390 ohm resistors take care of that for the woofer and the 47 ohm resistors and 2.7 uF capacitors for the full-range channel. At the same time they also filter.

Quote:
Originally Posted by scott68 View Post
On my full range (right channel) , if I want to lower the volume to match the woofer output, could I place a log/tapered pot after the mono resistors above and before your circuit. If so, what size, ie, 5k, 10K, 20 K or ?
At the output of the lower branch of the circuit (the high-pass part of the crossover filter), you could change the 1 kohm resistor to ground into a 1.2 kohm resistor and shunt it with a 5 kohm potmeter that drives the right channel of the amplifier.

Quote:
Originally Posted by scott68 View Post
Would another pot be able to vary the cutoff, ie from 100 to 200 hz vs your circuit 150 hz cutoff? If so , what size and where to place in your circuit?
Thanks
No, you would need five ganged potmeters with different values for that. That doesn't sound very practical.

Last edited by MarcelvdG; 19th March 2018 at 09:26 PM. Reason: 5 kohm potmeter with 1.2 kohm resistor is better than 20 kohm potmeter with 1 kohm resistor.
  Reply With Quote
Old 20th March 2018, 12:29 AM   #25
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by MarcelvdG View Post
Probably pin numbers, some schematic drawing programs assign pin numbers to all components. Please ignore them.
Yes they are pin numbers for the CAD system.
__________________
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 22nd August 2018, 08:04 PM   #26
MarcelvdG is offline MarcelvdG  Netherlands
diyAudio Member
 
Join Date: Mar 2003
Location: Haarlem, the Netherlands
Hi Scott, Any news about this project?
  Reply With Quote
Old 22nd August 2018, 11:23 PM   #27
scott68 is offline scott68  United States
diyAudio Member
 
Join Date: Nov 2016
Thanks for checking. I'm in the design process of building 15 near-field speakers for gifts to my friends (actually it has been over 6 months researching and designing - I think I like that more than the actual build.) I will be using your circuit that you so graciously spent time designing as it is going to make these speakers have a real nice "large" sound from the small 4 liter boxes.

I'm making the first demo box really adjustable so I can place any 2", 3" or 4" speaker/baffle in any or all four areas of the portable box with an internal bluetooth/usb battery/110volt amp. Then make a quick easy change to the inside of the box so I can test the spl for: sealed, Br, DCR, bandpass 4th order, bandpass 6th order, a 3" woofer two chamber ported into an external passive radiator (ie like the logitech 640) and all ports will have the option of aperiodic stuffing. Once I get the best sound, then I'll build 15 of them.
  Reply With Quote

Reply


Linkwitz-Riley 12 db line level calculationHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
line level attenuator calculation Edwardb Analog Line Level 46 18th January 2017 10:29 PM
Butterworth series to Linkwitz-Riley Calculation Hearinspace Analog Line Level 18 26th July 2016 09:42 AM
Linkwitz-Riley 24 dB/Octave pcb tonitonitoni Analog Line Level 4 13th March 2015 04:07 PM
linkwitz riley crossover davidel94 Multi-Way 12 29th September 2012 10:46 PM
A Challenge to Linkwitz-Riley ? jackinnj Multi-Way 17 14th March 2006 11:50 PM


New To Site? Need Help?

All times are GMT. The time now is 01:56 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki