My speakers Altec 604E. These speakers have high frequency extension just up to 12KHz.
I did experiments with back of ceiling firing tweeters. I used Morel MDT30 tweeters with 1st order filter. The effect of back of ceiling firing was like a saliva of singers where scattered around the room.
Then I used Morel MDT30 in forward firing way. I adjusted the phase by moving tweeters back and forward. Even 1mm makes a difference because at 10KHz the wave length is 340mm.
After that, I used Dick Sequerra Pyramid T9 ribbon super twitters.
A couple years ago, I started use a better parts in crossover and Duelund hook up wires. As result, I can use speakers without supertweeters at all with still good tonal balance.
Now I started using T90a. T90a suted much better to Altecs 604E. They give a huge positive effect. I use auto-transformer (-7.5dB tap). This solution is most SET amp friendly. The extra load of addition supertweeters loaded thought the auto-transformer is very mild.
Regards,
Alex.
I did experiments with back of ceiling firing tweeters. I used Morel MDT30 tweeters with 1st order filter. The effect of back of ceiling firing was like a saliva of singers where scattered around the room.
Then I used Morel MDT30 in forward firing way. I adjusted the phase by moving tweeters back and forward. Even 1mm makes a difference because at 10KHz the wave length is 340mm.
After that, I used Dick Sequerra Pyramid T9 ribbon super twitters.
A couple years ago, I started use a better parts in crossover and Duelund hook up wires. As result, I can use speakers without supertweeters at all with still good tonal balance.
Now I started using T90a. T90a suted much better to Altecs 604E. They give a huge positive effect. I use auto-transformer (-7.5dB tap). This solution is most SET amp friendly. The extra load of addition supertweeters loaded thought the auto-transformer is very mild.
Regards,
Alex.