- 积分
- 19692
- 在线时间
- 17781 小时
- 最后登录
- 2025-4-25
- 阅读权限
- 150
- 精华
- 17
 
- UID
- 2492
- 帖子
- 18343
- 精华
- 17
- 经验
- 19692 点
- 金钱
- 12949 ¥
- 注册时间
- 2004-12-23
|
引用一段:
“Most products claims to have "ultimate quality" as it's goal. If you listen to the companies, they are all the best.
Engineering is about compromises and tradeoffs. You can't get the best of the best of everything.
When you use a larger magnet you reduce airflow and typically reduce bass (Qts). Using a larger voice coil (eg. 3" ala Dynaudio style) gives higher power handling but ...[fill in the blanks]
Skaaning's AT drivers apparently use "some of the best motors in the business" (LDSG). They also use polypropylene cones. The aim of this is, IMHO, to ensure a smooth rolloff outside the passband, and thus faciliating easy crossover work. This is particularly welcome by DIYers who don't have measurement equipment and must rely on textbook-formula crossovers.
Some manufacturers use metal or other stiff composite cones for a more pistonic movement in an attempt to lower linear (~energy storage) and non-linear (~harmonic) distortion. The downside with all stiff cones is that they tend to resonate at some particular band of frequencies. Hence the speaker is going to sound horrible if you use shallow slope crossovers without traps (notch filters) for the ringing.
Better drivers have these cone breakups a little further out of their passband, but you still have to deal with it by a properly designed crossover. Throw away all those textbook crossover formulas and you better invest in some measuring equipment and software. Otherwise you'll never get it right.
I don't agree with Per Skaaning's argument regarding evaluation of a driver without a crossover. That's fine, if that driver is going to be used without a crossover. eg. full range driver, but when the system will use a crossover you need to evaluate the entire system. A crossover is not a just a filter. It tailors the frequency response and overall voicing.
IMHO the two greatest advantages of using AT drivers is that
1) you can place custom orders, even when ordering single units.
2) you can achieve good results even without a proper XO design, simply because the driver have a very flat and smooth broadband frequency response AND rolls off smoothly.
Anyway i'm going to stop now. Don't want to upset any AT users...” |
|