Hornresp

[NEO Dan]

Hi David_All,
I'm just wanting to know if I'm interpreting SPL scaling with Multiple Speakers correctly. In my design I have 2 dual 4Ω voice coil drivers in one TH cabinet. The coils are wired series parallel for a 4Ω nominal load per cabinet. Then things get interesting when I go to sim multiple cabinets. I want to maintain a 4Ω load at the amp so I simmed 4 cabs as 2Sx2P, 9 cabs=3Sx3P, 16 cabs=4Sx4P. The load at the amp is always 4Ω and what gets me is that driver excursion and SPL stay the same for a given drive voltage no matter how many cabinets I add in any combination. I could wire them 4P=1Ω,2Sx2P=4Ω,4S=16Ω; for vastly different amounts of power given the same drive voltage. Can you help me with the instructions on how to sim multiple cabinets accurately as the SPLin HR appears always as if the cabinets are wired in parallel?

Example all @ 2.83v applied voltage and wired to maintain a 4Ω load at the amp:

[brsanko]

How are you trying to sim multiple cabinets? I don't know of any way to do that.

[NEO Dan]

Originally Posted by brsanko

How are you trying to sim multiple cabinets? I don't know of any way to do that.

HR is chocked full of goodness have a look here:

[brsanko]

Here I was all ready to tell you you were doing something wrong and you showed me a new feature I didn't know about! SaweeeT!!

[brsanko]

Does anyone happen to know if there is any way to run hornresp in windows CE?

[David McBean]

Originally Posted by bubblersound

Sometimes when I press ESC from the spl response window it says "Run-time error '340': Control array element '1' doesn't exist".

Hi bubblersound,

Thanks for the feedback.

Could you please confirm that the error only occurs when the Esc key is pressed immediately after capturing or releasing chart results, and then only when the red "Current results captured" or "Captured results released" message is still being displayed.

If this is the case, then the problem will be fixed with the next release.

Thanks again for the feedback.

Kind regards,

David

[David McBean]

Originally Posted by NEO Dan

The load at the amp is always 4Ω and what gets me is that driver excursion and SPL stay the same for a given drive voltage no matter how many cabinets I add in any combination.

Hi Dan,

Not sure that I understand - the SPLs in your 4 example charts all seem to be different to me. Am I missing something?

Could you please post a copy of your input parameters window so that I can do some further tests. Thanks.

Kind regards,

David

[bubblersound]

Originally Posted by David McBean

Could you please confirm that the error only occurs when the Esc key is pressed immediately after capturing or releasing chart results, and then only when the red "Current results captured" or "Captured results released" message is still being displayed.

Yes, I've tried it a few times and it's when I hit ESC while the red message is displayed. Thanks David.

[NEO Dan]

Originally Posted by David McBean

Hi Dan,

Not sure that I understand - the SPLs in your 4 example charts all seem to be different to me. Am I missing something?

Could you please post a copy of your input parameters window so that I can do some further tests. Thanks.

Kind regards,

David

I'm sorry David,
I did not explain clearly or correctly,
The graphs above all present the same 4Ω load to the amp. For a clearer explanation please use the input parameters below:


For this test you will not need to change anything in the input panel, just in multi speaker.

Please do a 4P, 4S, and 2S x 2P in multi speaker, when you compare will find that SPL and excursion for 4S as well as 2S x 2P are wrong, but impedance is correct for all configurations. It appears as all entries in multi speakers are converted to parallel for SPL and displacement. Unfortunately this is would cause a user to believe he could achieve very high SPL with little total power applied to an array.


Another example is Blubbersound's 150dB@60hz target can be accurately simulated by setting voltage to 220v and driver config to 3Sx2P in input panel, then select 4P in multi speaker. As you can see it will take SLIGHTLY more than 4KW to drive the array to 150dB. Thus I conclude that multi speaker module only gives valid results in parallel. Note driver's excursion is good in band

[David McBean]

Originally Posted by bubblersound

Yes, I've tried it a few times and it's when I hit ESC while the red message is displayed.

Hi bubblersound,

Thanks for the confirmation, and for bringing this bug to my attention. I would never have found it myself in a million years - it was an extremely subtle one :-).

The problem will be fixed in Version 26.00 - hopefully to be released in the next week or so. I am currently working on extending the Tapped Horn Wizard so that the tool can be used with all loudspeaker systems, except for non-conical single-segment horns.

Kind regards,

David