Go Back   Home > Forums > >

PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

Multi Entry Horn - Low/Mid Box Only - Sim Help
Multi Entry Horn - Low/Mid Box Only - Sim Help
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
Old 20th January 2021, 12:42 AM   #1
johnnyjo is offline johnnyjo
diyAudio Member
 
Join Date: May 2014
Location: San Antonio, Texas
Default Multi Entry Horn - Low/Mid Box Only - Sim Help

I'm working on this idea of a MEH cabinet but with mids and lows only. Using Hornsrep screenshots it seems hard to visualize. But I will draw this up as soon as I get some clarification.

Nd Record
Click the image to open in full size.

ME1 Record
Click the image to open in full size.

HR Schematic
Click the image to open in full size.

Regarding the ME1 Record:
I'm assuming HR is using S2 for the location of the entry ports. Is this a correct assumption?

Ap1 and Ap2 I'm not sure about. If I'm just using a 2-inch cutout then both of these values should be the same correct?

Vrc and Lrc seem to have default values. I can't remove them. I was thinking the Nd record governed the horn dimensions as well as the rear chamber. Why is Vrc and Lrc populated in the ME1 record?

Last edited by johnnyjo; 21st January 2021 at 12:23 AM.
  Reply With Quote
Old 20th January 2021, 03:07 PM   #2
kipman725 is offline kipman725  United Kingdom
Overly Enthusiastic
diyAudio Member
 
kipman725's Avatar
 
Join Date: Jun 2007
Location: Warrington
Multi Entry Horn - Low/Mid Box Only - Sim Help Send a message via MSN to kipman725
Your attachments aren't working. Try using the go advanced button and then attaching them to the post.
  Reply With Quote
Old 20th January 2021, 04:13 PM   #3
johnnyjo is offline johnnyjo
diyAudio Member
 
Join Date: May 2014
Location: San Antonio, Texas
Darn! Thanks for letting me know. I'll update this tonight.
  Reply With Quote
Old 21st January 2021, 12:31 AM   #4
johnnyjo is offline johnnyjo
diyAudio Member
 
Join Date: May 2014
Location: San Antonio, Texas
Updated images - I was using google drive and got the URL wrong...
  Reply With Quote
Old 22nd January 2021, 06:18 AM   #5
David McBean is offline David McBean  Australia
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by johnnyjo View Post
I'm assuming HR is using S2 for the location of the entry ports. Is this a correct assumption?
Yes. The position of the entry point is shown in the right-hand drop-down list box. The position can be changed to S3 if required by selecting that option.

Quote:
Originally Posted by johnnyjo View Post
Ap1 and Ap2 I'm not sure about. If I'm just using a 2-inch cutout then both of these values should be the same correct?
Yes. If you update your version of Hornresp, you will find that the port can be flared if required.

Quote:
Originally Posted by johnnyjo View Post
Why is Vrc and Lrc populated in the ME1 record?
Because you have specified a vented rear chamber behind the ME1 driver. Just delete the Vrc and/or Lrc values in the ME1 Input Parameters window input boxes, or set the ME1 Vrc and/or Lrc sliders to zero in the wizard.
Attached Images
File Type: png Attach_1.png (50.0 KB, 93 views)
__________________
www.hornresp.net
  Reply With Quote
Old 23rd January 2021, 12:59 AM   #6
johnnyjo is offline johnnyjo
diyAudio Member
 
Join Date: May 2014
Location: San Antonio, Texas
Default Quarter Wavelength Calculations

Thanks for the Hornresp clarifications!
For the next step I'm measuring the length of the wave and this is somewhat confusing because where exactly am I measuring from or to?

I think the wavelength calculation is correct. Can someone help? See below...

Click the image to open in full size.
  Reply With Quote
Old 23rd January 2021, 07:03 PM   #7
weltersys is offline weltersys  United States
diyAudio Member
 
weltersys's Avatar
 
Join Date: Jan 2008
Location: Florida
Your wavelength calculation is correct for 67 degrees F, I use 1130 FPS, which is the speed of sound at 71.6F ...

Ideally, to eliminate off-axis response dips, the center to center distance between the cone driver exit ports should also be 1/4 wavelength (or less) distance apart. In your example, this could be accomplished simply by moving the 2" ports closer to the center of the cone.

The exit size for the driver at the horn apex (throat) appears to be approximately equal to the driver Sd, in which case the acoustic point of origin will probably be near the dust cap. If the throat were restricted enough to cause an acoustic low pass (like the side drivers) due to VTC, the acoustic point of origin would be near the baffle/port exit.

Last edited by weltersys; 23rd January 2021 at 07:10 PM.
  Reply to this post

Reply


Multi Entry Horn - Low/Mid Box Only - Sim HelpHide this!Advertise here!
Thread Tools

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
Suitability of ME464 as a multi-entry horn / synergy diyuser2010 Multi-Way 25 8th November 2020 01:54 PM
Multi entry undersized bass horn jzagaja Subwoofers 3 23rd December 2019 05:02 PM
Please Critique my multi-entry horn simulation zobsky Multi-Way 12 8th January 2019 12:37 PM
Real multi room, multi input-multi output audio system for smart home gryzli133 PC Based 3 26th January 2018 05:15 PM
Help with sim on this new Altec mid bass horn atilsley Multi-Way 0 17th April 2013 02:19 AM


New To Site? Need Help?

All times are GMT. The time now is 09:15 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki