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Old 21st October 2014, 08:53 AM   #1
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Default User driver with a QTS > 1

Is it useful or rational to build a driver with a QTS between 0.9 and 1.1 in a Box with ports (could be a TL or TQWT)?

If the simulation with tools, such as the transmission line modelling tool, shows a reasonable frequency response, could it work or is this complete ********?
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Old 21st October 2014, 09:24 AM   #2
S4m is offline S4m  Germany
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Using the TSP like the fs-qts-ratio of a driver can only be seen as a first approximation.
The following simulation doesn't tell you anything about the sound quality of the resulting box. If you have the opportunity design/simulate different chamber-types for your speaker and and choose for yourself if you prefer BR, TL, CB or OB.
A TL can be easily realized after the following calculation:
Transmissinonslinie- Berechnung "Intertechnik-Line" | Lautsprecherbau
For simulation of Chambers I use LASIP. It works very well IMHO!
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Old 21st October 2014, 09:47 AM   #3
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Quote:
The following simulation doesn't tell you anything about the sound quality of the resulting box.
Sure, but the biggest problem of drivers with a qts > 1 is the overdone bass, isn't it?

Quote:
If you have the opportunity design/simulate different chamber-types for your speaker and and choose for yourself if you prefer BR, TL, CB or OB.
I really like transmission lines. But i hate OB ^^.

Quote:
For simulation of Chambers I use LASIP. It works very well IMHO!
I think the transmission modelling tool from leonard audio is as good as lasip.

So is it possible to get a good speaker out of a transmission line with a driver which has a qts > 1?
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Old 21st October 2014, 11:03 AM   #4
Sonce is offline Sonce  Macedonia
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Originally Posted by theKenDo View Post
So is it possible to get a good speaker out of a transmission line with a driver which has a qts > 1?
Besides OB, the TL is the only way to get a quality bass from a high Qts loudspeaker. So yes, go for it!
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Old 21st October 2014, 11:08 AM   #5
S4m is offline S4m  Germany
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+1 Sonce
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Old 21st October 2014, 11:19 AM   #6
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If the driver has a high Qms (close to 10), so most of the Qts is determined by Qes, a BR might work. You will wind up with a large cabinet and a low tuning and it is not certain it will work, but it is worth a try.

For example, both these drivers work very well in a BR, in spite of high Qts (although not quite one, both drivers fall completely out of the recommended bandwith for BR, the reason is the ratio of Qes over Qms).

https://www.parts-express.com/auraso...8-ohm--296-258

https://www.parts-express.com/dayton...8-ohm--290-214
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