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MINGSU wrote:

The SG146LD4 driver can play down to 20Hz but we choose to crossover the horn at 70Hz only due to the space limitation of my listening room.

Ming, here is the whole point. If the driver meant to be play20Hz then it has most likely resonance frequency somewhere near or sub 20Hz. This type of the driver will have VERY difficult time, if it any possible to deal with throat reactance of the 70Hz horn. You would need to use there a driver with 40Hz -60Hz of primary resonance. If you do so then will be able to use the full mouth of your horn and do not cut it off 10Hz ABOVE the horn rate.

MINGSU wrote:

I don't know if the SG146LD4 should be classified as cone-driver or other type of driver so I have attached some picture of the driver with my posting.

Actually it is very interesting driver and it looks different then I tonight. I never had GOTO driver in my room so it is difficult to be to say but it looks like 4” exit and titanium cone. They mostly likely vented it for 20Hz in the space across magnet, using the Audio-Technica venting methods (with felted ports). You might find out how they did it and you might alter the back chamber for have higher resonance frequency. Who knows – it has very light cone and you might be able to increased the driver’s resonance frequency 3 times from where it is now – then you will be able to load your horn with full mouth… and you will have “different type” of midbass…

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