Hornresp
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
 10th February 2011, 11:47 PM #1641 John Sheerin   diyAudio Member   Join Date: Nov 2003 Location: California It's a combination of voltage (power) and excursion limitations that you input. So at different frequencies, different limits might apply creating an odd looking curve.
 11th February 2011, 12:11 AM #1642 soho54   diyAudio Member   Join Date: Nov 2005 Location: Georgia Think of it as two graphs in one. You set an Xmax limit, and a Voltage limit. HR then adds Voltage at each frequency until one of the two limits is reached. If it runs out of Xmax first it is indicated by a Red line point. If it hits the Voltage limit first it is marked Black. __________________ AkAbak How-To----Hornresp How-To----Eazy Horn Excel Spreadsheet
David McBean
diyAudio Member

Join Date: Jun 2007
Hi NEO Dan,

Quote:
 Originally Posted by soho54 You set an Xmax limit, and a Voltage limit.
Just to clarify, you actually set an Xmax limit and an input power limit. The voltage varies with frequency for a given constant input power because of the reactive nature of the impedance load.

See the Maximum SPL description on page 14 of the Help file for details.

Kind regards,

David
__________________
www.hornresp.net

Last edited by David McBean; 11th February 2011 at 12:36 AM.

 11th February 2011, 12:53 AM #1644 soho54   diyAudio Member   Join Date: Nov 2005 Location: Georgia LOL, sorry about that. I was thinking Power, and Voltage popped out. Too use to the main data page I guess. What's funny is that I just answered a similar question on another forum today, and used Power. __________________ AkAbak How-To----Hornresp How-To----Eazy Horn Excel Spreadsheet Last edited by soho54; 11th February 2011 at 12:57 AM.
 11th February 2011, 03:10 AM #1645 NEO Dan   diyAudio Member     Join Date: Jun 2008 Location: N.E. Ohio Ahh thanks David, Now I see what the tool is for, thermal vs displacement. Which brings me back to my original point, which I didn't make very well. Folks are using this tool for comparison of displacement limited power handling. But if I understand the way the tool works the simulation is that of a current source because it has no notion of nominal impedance and there for cannot "set" a voltage. In common usage speakers are driven by voltage source amps instead of current sources like industrial amps for MRI field coils, I've heard the behavior is quite different. If my understanding of the situation is not flawed the result we currently see is not representative of real world usage scenario's. For example when driver excursion and impedance are high at the same frequency; I belive the simulation would allow for much more voltage to be applied into the impedance peak to produce the desired "power" level this would potentially produce a false indication of over-excursion when in reality you'd have clipped the amp and run out of power. As labeled the tool is valid, however I do think it is commonly misinterpreted and I think the option to toggle to a drive voltage mode of would be a more useful feature. --- Added: Basically I think it should function as the main input screen in HR already does with the same power calculation subroutine for a voltage input box. __________________ Regards, Dan Last edited by NEO Dan; 11th February 2011 at 03:26 AM.
 11th February 2011, 04:22 AM #1646 soho54   diyAudio Member   Join Date: Nov 2005 Location: Georgia It is displacement limited power handling, only it is per frequency instead of per frequency response. You can get a FR voltage limited graph using the rest of the HR program. It is really easy with the wizard. Just use the displacement graph, and add voltage until it hits the displacement limit, switch back over to Response, and there you go. Run both, and you will find you get the same SPL:Voltage point using the lowest red frequency in the passband in the Maximum SPL graph, and following the voltage:displacement method. The HR Maximim SPL method also gives you the EQ limits, the other version doesn't on its own. __________________ AkAbak How-To----Hornresp How-To----Eazy Horn Excel Spreadsheet
David McBean
diyAudio Member

Join Date: Jun 2007
Bug Fix

Hi Everyone,

Quote:
 Originally Posted by David McBean Thanks GM. I will have a look at the data and let you know by return e-mail if I find anything.
The bug identified by GM has now been fixed. The latest Hornresp release is Product Number 2830-110211.

Kind regards,

David
__________________
www.hornresp.net

David McBean
diyAudio Member

Join Date: Jun 2007
Quote:
 Originally Posted by David McBean I will have a look when I get a chance.
Hi Brian,

I remembered why the throat adaptor entry only has a conical expansion :-). The constraint was applied so that the suite of Directivity tools can still be used with single-segment horns, even though a throat adapter entry might be specified. The way that the Hornresp directivity model works, this would not be possible otherwise.

By way of background, the throat adaptor entry was really intended to be used as part of the specification of a mid-range compression driver. In most cases the adaptor expansion rate for a practical 'real-world' compression driver will be conical, and even if it is not, because it is normally so short, the overall power response performance is unlikely to be significantly changed anyway.

At this stage and after giving it much consideration, I think it is probably better to leave things as they are.

Sorry - there is no simple way of getting a 'fifth-segment' option in Hornresp, if that is what you were really looking for :-).

Kind regards,

David
__________________
www.hornresp.net

NEO Dan
diyAudio Member

Join Date: Jun 2008
Location: N.E. Ohio
We drive speakers with voltage not power.

Man this feature is widely misunderstood/confusing

And that's why I am tired of seeing people use it to show performance.
Attached Images
 HR2.PNG (14.7 KB, 116 views)
__________________
Regards,
Dan

Last edited by NEO Dan; 11th February 2011 at 05:23 AM.

David McBean
diyAudio Member

Join Date: Jun 2007
Quote:
 Originally Posted by NEO Dan But if I understand the way the tool works the simulation is that of a current source because it has no notion of nominal impedance and there for cannot "set" a voltage.
Hi NEO Dan,

With Xmax set to a large value so that the Maximum SPL result is not displacement-limited at any frequency, the simulation will be that of a constant power source, not a constant current source. Try using the Sample tool with the Maximum SPL chart, to see how the voltage, power and displacement can vary at different frequencies.

The normal SPL response is generated using a constant voltage source Eg (assuming Rg = 0).

Kind regards,

David
__________________
www.hornresp.net

 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 Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         Dx Classic Amplifiers         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post FlipC Subwoofers 11 4th June 2016 06:33 AM brsanko Full Range 4 18th October 2008 09:36 PM 316a Multi-Way 0 11th February 2004 03:56 PM

 New To Site? Need Help?

All times are GMT. The time now is 07:26 AM.