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real efficiency tham 15 martinsson
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Old 9th July 2018, 09:12 AM   #1
angelodj is offline angelodj
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Default real efficiency tham 15 martinsson

On the net there are these graphs related to tham 15 loaded with 15tbx100, but which of the subjects is correct?

There is a big difference in decibels ...

I would like to compare them with the emissions of "turbosound 118" and other basses to make the bass more performing for my use.

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Old 9th July 2018, 09:51 AM   #2
Xoc1 is offline Xoc1  United Kingdom
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You have presented some graphs and you want to know if they are correct.
So firstly what is the input data for the Hornresp sims?
Is the input data correct to the layout of the speaker and how well has the path been simplified to suit the limited amount of sections in Hornresp? Hint here is to check the reported volume in Hornresp and see how closely the internal volume of the cabinet layout compares.
Obviously check the driver parameters, voltage and speaker placement - 2pi is commonly used for comparison.
What data have you for the Turbosound 118? - this is not a complete description of any Turbosound cabinet I know - It will use a custom driver and a cabinet layout that will not be freely available, so how are you going to compare it?
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Old 9th July 2018, 09:53 AM   #3
chris661 is offline chris661  United Kingdom
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You're comparing 1pi simulations vs 2pi.

One is on the floor and against a wall, the other is just on the floor.

Chris
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Old 9th July 2018, 10:05 AM   #4
angelodj is offline angelodj
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thanks Chris!
xoc, the graphics I took them from the blog of martinnson, the tham 12 seemed much more efficient! maybe they will be 2Pi simulations?
Report to the simulation of turbosound 118, will 1Pi or 2Pi?
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Old 9th July 2018, 11:43 AM   #5
angelodj is offline angelodj
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in the meantime I had fun comparing a tham with coral 812 with a 15. same amp, (keap car cone ), the tham has more energy!
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Old 9th July 2018, 11:43 AM   #6
angelodj is offline angelodj
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Old 9th July 2018, 12:05 PM   #7
angelodj is offline angelodj
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this is my simulation with the coral woofer, 2xPi
really not bad!
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Old 9th July 2018, 12:19 PM   #8
Xoc1 is offline Xoc1  United Kingdom
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The Turbosound Bandpass horn - that you show in your picture would be about right at 105db/W - But needs to be simulated in multiples to get the low end extension correct.
The Tham box would be about 100db/W - Its advantage is based on its small size rather than its efficiency. Multiples of the tapped horn will not show the gains in low end performance that the bandpass horns will when used in groups.
The reflex cabinet will probably be 96db/W or less, so that's why the Tham has more energy. if you are concerned about efficiency of the speaker system I would look at a bigger design of tapped horn than the Tham series.
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Old 9th July 2018, 12:32 PM   #9
angelodj is offline angelodj
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which tapped horn do you recommend that be as efficient, as compact as possible?
jbell ss15? or 18" version (Xoc1 ) tham18?

will have more efficiency in the 40-80hz band 6tham15 or 4 tham 18?

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Old 9th July 2018, 01:56 PM   #10
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