Yes that makes sense. I think his assumption was that the cone would be loaded in an asymmetrical way. I could be misremembering or conflating what he actually said as the convo was a while ago. This particular speaker designer has presented to peers on power ratings before and I seem to recall something like that about certain horn loading configurations.
I have two THAM 15 mk2 with B&C 15TBX100 drivers (8 ohm). At which power will they reach their Xmax? Each driver has a 2000 W amp (bridged Yamaha P7000S); do I need to worry about destroying the driver?
What you need is a highpass filter to limit excursion- What sort of crossover will you be using? A quick check suggests 8th order at 33hz or so should work.
I have a Yamaha SP2060 DSP. I currently have highpass-filter at 40 hz (24 dB/oct BW). I have a 48 dB/oct crossover (LR) at 110 hz. In the attached image you can se the frequency response just a feet in front of the sub.
I would say 35Hz hi pass 24db would give a bit more excursion, which can keep the driver cooler and allow a bit more bandwidth. The Yamaha processor seems only have one limiter per channel . I would of thought that a longer attack & release characteristic would provide adequate themal protection for the driver as long as clipping was avoided. Top range speaker processors have Peak (max power or clipping limit) - Thermal (longer atack & release characteristic), and excursion limiters operating only at lower frequencies.
In this case I think that voice coil overheating would be the primary failure mode!
In this case I think that voice coil overheating would be the primary failure mode!
Displacment seems a bit high at full power but is not allowing for any compression or other losses - Xmax is exceeded but I am not sure what Xmech is with your driver & only at this level with transient peaks if hard limiting or clipping is avoided. - The lower Hi-pass allows a more balanced excursion above & below the minimum.
Hello again! Seems to be lot’s of experts here 🙂. I have another question. As I mentioned previous I use one Yamaha P7000S, bridged at 8 ohms per channel (2000w). I have read many posts at other forums not recommending using the P7000S for subs. I am not sure why… Would (for example) a single LAB 4000 be a better option even though it will only give 1300W per channel (specs)?
I would love to make a tham15 but tuned to 32-35hz if I can does anyone have any plans for a lower tuned tham15 probably going to be using a sundown audio SA v2 15 or a E v3 15 but im
More towards the SA only because I own a E v3 12 in a 6th order parallel band pass it does grate for inside the house on 750w but looking for something outside for movie nights and to take it to party’s and stuff would anyone have any screen shots of a tham15 but tuned lower 32-35hz cheers Ricky
More towards the SA only because I own a E v3 12 in a 6th order parallel band pass it does grate for inside the house on 750w but looking for something outside for movie nights and to take it to party’s and stuff would anyone have any screen shots of a tham15 but tuned lower 32-35hz cheers Ricky
The plan is available in the link below. There is a tutorial section in the website explaining how to use the model. to tune it lower them original design you just need to increase horn length, to do that you can increase baffle size and it will impact other dimensions automatically..
https://freeloudspeakerplan.rf.gd/pages/th-tham.htm
Hi Loardsansui thank you for the link but however I’m quite useless when it comes to computer programs and never really made a design before and was wondering if anyone had a preset plan that’s already available as it would be easy just to print a cut out sheet and make it
It only requires double clicks, edit number and press enter, so, anyone can do it if interested. No technical knowledge is required.
There is a potential, the FS is low and BL is high, Qts sens high, need to simulate to confirm, if needed you can also adjust the area to better fit the model to your driver, for instance, if drive cone is weak (paper) it may worth reducing compression ratio, etc. You can start simulation as it is and slowly people help you improving.
I keep on getting wired numbers on CMS and do I need to touch vrc fr vtc lrc tal atc I don’t know where to put dismeter of subwoofer