Mcargill: The Focus doesn't use anything close to a true D'Appolito design. D'Appolito's follow a specific pattern in terms of driver sizes, spacing between drivers, crossover slopes, etc...
Having said that, i do agree that mic placement could change things pretty drastically, especially with this design. This has to do with the fact that the drivers are mounted not only vertically staggered but also horizontally too. This will produce a pretty strange and random radiation pattern that will be plagued by peaks and dips due to comb filtering. Using this type of design, the ability to localize specific imagery is also reduced.
Comb filtering takes place when you have more than one driver covering the same frequency range and they are spaced apart from each other. While bringing the drivers closer together may reduce comb filtering to a certain extent, all it really does is raise the frequency at where it will take place.
John Atkinson commented that best results would be obtained if one were sitting with their ears slightly above tweeter level. Given that the tweeters on the 20/20 are situated 45" above ground level, this may be pretty hard to achieve for most people of average height sitting on a typical chair or couch. Sean
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Having said that, i do agree that mic placement could change things pretty drastically, especially with this design. This has to do with the fact that the drivers are mounted not only vertically staggered but also horizontally too. This will produce a pretty strange and random radiation pattern that will be plagued by peaks and dips due to comb filtering. Using this type of design, the ability to localize specific imagery is also reduced.
Comb filtering takes place when you have more than one driver covering the same frequency range and they are spaced apart from each other. While bringing the drivers closer together may reduce comb filtering to a certain extent, all it really does is raise the frequency at where it will take place.
John Atkinson commented that best results would be obtained if one were sitting with their ears slightly above tweeter level. Given that the tweeters on the 20/20 are situated 45" above ground level, this may be pretty hard to achieve for most people of average height sitting on a typical chair or couch. Sean
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