Simulating the Eminence Alpha 15a and Delta 15a drivers in an OB shows quite a bit of difference in the low end below 70Hz . The Delta is much more efficient but has a very drooping low end which might need some bass eq. The Alpha on the other hand goes down much lower but is less efficient. That's expected with the Qts of the Alpha being 1.26 and the Qts of the Delta being 0.53 .
I guess the Delta can be EQ'd to be similar to the Alpha's response.
The million dollar question is will the Delta sound better in this case ? Specifically will the "Qts" difference be audible ? A high Q will cause ringing on stepped signals . Will this be audible as floppier bass on the Alpha ? I know the argument will arise about the 'HF' harmonics of the bass will be 'crossed over'. But what about a single cycle of say 40Hz ?
I have read differing opinions on this issue. Some said the Alpha's bass is not 'tight' as compared to that of the Delta in an OB application.
Anyone tried the two drivers in identical OB's ?
I guess the Delta can be EQ'd to be similar to the Alpha's response.
The million dollar question is will the Delta sound better in this case ? Specifically will the "Qts" difference be audible ? A high Q will cause ringing on stepped signals . Will this be audible as floppier bass on the Alpha ? I know the argument will arise about the 'HF' harmonics of the bass will be 'crossed over'. But what about a single cycle of say 40Hz ?
I have read differing opinions on this issue. Some said the Alpha's bass is not 'tight' as compared to that of the Delta in an OB application.
Anyone tried the two drivers in identical OB's ?
You are right , there are a lot of factors involved in this.
The BL factor in the Delta 15A is much higher and so inherently it should damp much better. How the amp handles that is a different matter. We shall assume that all external factors apart from the driver and baffles are ideal !
Now any listening observations ?
Given a choice between an Alpha 15A and a Delta 15A , which would be a better driver to pick ? Active EQ'ing not being an issue at all. Just over all bass quality.
The BL factor in the Delta 15A is much higher and so inherently it should damp much better. How the amp handles that is a different matter. We shall assume that all external factors apart from the driver and baffles are ideal !
Now any listening observations ?
Given a choice between an Alpha 15A and a Delta 15A , which would be a better driver to pick ? Active EQ'ing not being an issue at all. Just over all bass quality.
Noone tried the ToneTubby 12" Alnico yet ?
http://www.tonetubby.com/specs12a16.htm
Its in 8ohm too, if you only want one
Btw...there is a DELTA 15 LF with higher Qts
But actually I dont think the Qts is most important, I am more concerned about the relative high Fs on these drivers, which may be necessary due to the weak motor design...it might help a bit with multiple drivers
Strassacker has a KAPPA-18 with "low" Fs listed ... I havent seen it elsewhere
http://www.tonetubby.com/specs12a16.htm
Its in 8ohm too, if you only want one
Btw...there is a DELTA 15 LF with higher Qts
But actually I dont think the Qts is most important, I am more concerned about the relative high Fs on these drivers, which may be necessary due to the weak motor design...it might help a bit with multiple drivers
Strassacker has a KAPPA-18 with "low" Fs listed ... I havent seen it elsewhere
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