The impedance curve on that website is a modelled one, whereas the data from B&C appears to be measured. I wouldn't bet on the modelled one, especially given how different they are.
There's not much I can add. Your sim doesn't look right, but I don't know why, as I'm not familiar with your software. Also I don't know what baffle size you are modelling.
I'm not sure what you are asking. If I was you I'd try some software that you can get credible results from, and I'd try to model the effect of whatever kind of crossover you plan to use, to get a better idea if your plan is likely to work.
There's not much I can add. Your sim doesn't look right, but I don't know why, as I'm not familiar with your software. Also I don't know what baffle size you are modelling.
I'm not sure what you are asking. If I was you I'd try some software that you can get credible results from, and I'd try to model the effect of whatever kind of crossover you plan to use, to get a better idea if your plan is likely to work.
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Thank you very much for clarification! As for now Bafflesize will be 238 x 238mm. I tried to select driver/enclosure the way, that it will match to the Subwoofer pretty neat by itself. Crossover will be next step. For now i just wanted to make sure, that the Driver works well in the Enclosure (SPL/Frequency). Then i stumbled across this weird looking Bump and now i want to find out whats wrong first.
Your right for sure when you say i should try software where i can get credible results but WinISD for example is to inaccurat concerning the Frequencies above the low frequency rolloff.
When i find out how to get my graph straight ill let you guys know
maybe the driver just looks like this in an 8.5l Enclosure.
Ty all!
Your right for sure when you say i should try software where i can get credible results but WinISD for example is to inaccurat concerning the Frequencies above the low frequency rolloff.
When i find out how to get my graph straight ill let you guys know
maybe the driver just looks like this in an 8.5l Enclosure.Ty all!
I also suspect certain similarities between AJHorn and hornresp. These simulate more than a box modeller and perhaps the hornresp crowd would recognise the effects...?
We have a hornresp thread here - https://www.diyaudio.com/community/threads/hornresp.119854/unread
Logically, the only parameter able to roll the response downward is voice coil inductance and I suspect
AJHorn has done something to make the tilt down. When you put the Rdc=8, which is wrong, then the
response in AJHorn gets straighter because now the Z1k and Z10k values appear less inductive.
We know the impedance modeled at loudspeaker database is not completely accurate because the Z1k=5.7
computes to L3=0.39mH which is not as measured by manufacturer.
I have tried Hornresp and the response looks normal.
And you have entered wrong value for Sd. It's 220 cm2, not 200.
AJHorn has done something to make the tilt down. When you put the Rdc=8, which is wrong, then the
response in AJHorn gets straighter because now the Z1k and Z10k values appear less inductive.
We know the impedance modeled at loudspeaker database is not completely accurate because the Z1k=5.7
computes to L3=0.39mH which is not as measured by manufacturer.
I have tried Hornresp and the response looks normal.
And you have entered wrong value for Sd. It's 220 cm2, not 200.
Thank you for the Response Lojzek. I actually built the Speaker two days ago, and measured it without damping Material. The SPL/f Graph did look pretty decent without the downwards tilt. In which roomconditions did you simulate in Hornresp?
I found, when i take freespace instead of halfspace, the graph looks normal'ish.
Your right about the 220cm2, my apologies.
I found, when i take freespace instead of halfspace, the graph looks normal'ish.
Your right about the 220cm2, my apologies.