The focused verticle directivity is no longer spec as that is left to the manufactor to have some freedom in their design philosophy. :whistling:
Posts by thewire
1 - 4 of 22 Posts
It's 105dB with Select, Select2, Ultra, Ultra2, and so on until they ever decide to change it. It is dependent on which size room it is meant to go into how loud the speaker will go. All THX certified subwoofers go to 115dB and feature less than 2% distortion. I have four in a 2300 cubic foot room. The idea is to have 20dB headroom and since I run mine without the plate amps they came with there is no limiters. This eats my 16dB or so headroom right off at the subs so I keep it about the same level they would otherwise be as a single sub.
Select and Select2 speakers can be 100Hz crossover and can feature monopole surrounds in Select. The front speakers do not have to be the same speaker also. Ultra 2 has 2 monopole rear surrounds next to one another in a THX setup. A THX setup has four surrounds, and these can also be on the side walls. Typical listening level is -10 with 105dB peaks distortion free and the room must meet THX requirements as well. Everything else is recommended to be THX certified in a THX setup also. THX even recommends THX certified wire and cables. Typical cost for a THX certified home theaters are from 40K to 200K. There is a proccess to setup or design the room and postion speakers and the screen also but you probobly knew that already.
Select and Select2 speakers can be 100Hz crossover and can feature monopole surrounds in Select. The front speakers do not have to be the same speaker also. Ultra 2 has 2 monopole rear surrounds next to one another in a THX setup. A THX setup has four surrounds, and these can also be on the side walls. Typical listening level is -10 with 105dB peaks distortion free and the room must meet THX requirements as well. Everything else is recommended to be THX certified in a THX setup also. THX even recommends THX certified wire and cables. Typical cost for a THX certified home theaters are from 40K to 200K. There is a proccess to setup or design the room and postion speakers and the screen also but you probobly knew that already.
I beleave that the vertical dispertion characteristics were loosened about the time Snell started releasing Ultra2, but I will see if I can find exactly when.My bad. Well there's always the KL-650 that goes with those subs...600W into 97dB is about 124dB-ish?
It's my understanding the Klipsch was heavily involved with the writing of the THX spec - and collapsing verticals was a favorite trick of Paul Klipsch. Roy Delgado has since moved towards constant directivity in both the horizonal and vertical. I can't help but wonder if that wasn't around the time when the THX spec "loosened up"?
I believe it was Roy who mentioned that the major criteria was low distortion, controlled polars, with low levels of power compression...something Klipsch has been doing for years and is why they stick to horns. The downside with DIY is that these specs are rarely if ever published.
Can you tell I'm a Klipsch fan?
I was not able to find it with the THX website, but the Atlantic Technology 8200 THX Ultra2 Speaker System in October, 2003 had relaxed the vertical focused verticle directivity. This was the same year that Snell released some Ultra2 so it might be safe to say 2003.
1 - 4 of 22 Posts
