Ben兄：Thank you. I will definitely explore and compare, so far I’m having so much fun with all these options.

#277

As long as you like what you hear. Probably, the accuphase added a taste that you like. This is not unusual as their gears always have a prominent signature.

There’s no problem, for the 4343s, in running the crossover twice into the three mids and highs drivers and another channel to the bass, and somehow, this sounds a lot better than driving them with a bi-amp setup. The only reason that I can think of is the quality of Accuphase DF-35 external crossover surpasses the original JBL ones. I don’t know if I’m right though.

#273

I understood your point.

Yet, 4343 is actually 4 way. Thus, the way the speaker terminal structured was to break the 4 way crossover into "top-3-way" + "1 way bass" for supposedly better control of the bass if one bi-amp.

Thus, If you uses a active crossover to drive the "1 way bass", "top-3-way" and additional supertweeter, you are still using the crossover inside the speaker for the crucial top 3 ways.

True active crossover should have each driver connect to an amp directly to eliminate the crossover in between for maximum clarity and control. This is also why I think connecting extra active crossover this way to 4343 may not be worthwhile and may cause problem if the cut off slope between crossovers do not match. Plus, by doing so, one extra gear is also added along the signal chain.

Usually, people uses active crossover for their diy/self-matching drivers. 4343 is a great and complete speaker by itself for music listening. I can see why a supertweeter can be added but I would just do it in the simpliest way.

最後修改時間: 2021-11-03 01:03:19

That’s my understanding, thank you sir.

JBL 4343 is built to handle bi-amp via external crossover. Accuphase DF-35 can certainly add a super tweeter to it.

[271] 也許我未能完全理解你所講的，尤其是對前級的要求。我用的電子數碼分音最多可以有四路，每路獨立調教分頻點、左右音量、slope、相位和delay等，我的理解是應該可行的。

#270 理論上我是明白的，但心理上成日迎住可以把對超高音再推好啲。

記得小時候我的叔叔是超級發燒友，佢唔知響邊間戲院執笠班返嚟兩舊好似半個防空洞咁大軍用灰色的超高音。然後佢跟我講：「世姪，佢發出嘅聲音你係聽唔到的，但係佢會為你創造音樂裏嘅空間。就在這模擬的空間中，佢帶你超越時空與播放出來的音樂現場及已不在世的演奏者共存一陣子。」這番說話我幾十年後才開始領悟到他的意思，真係好想坐時光機帶着今天的耳仔再去聽他往日的系統。現在我只好懷着他的一點發燒精神去探索探索。

#270

我同意有獨立後級招呼超高原則上是最好。但實際接駁有一定難度。

主要是如可抽出 15k的音頻出來供指定後級。現在的4343接法是用了自己的分音器。加上電分只是做實驗但結果是過了兩次分音。當然可由前級輸出分兩邊行，原後級推4343, 另一邊入電分只出超高駁另一後級推超高，但前級的負荷會大了，也增加了唔同 impedance 的變數。

一般成年人好少聽到15KHz 以上聲音。相信一首音樂入面，15KHz 內容少過1%。再加上超高音單元一定非常之輕快，如果唔係一秒鐘跳唔好到15000次，所以好少能量 可以推得掂。

買多隻amp 推超高音，amp 會get lazy。

I love them too. I guess I’m just playing, experimenting, it’s so much fun! My feeling is, like you said, I’ll go back to driving them with one amp and maybe attach a super tweeter. Thank you for your advice, brother!

I like 4343 much. It's a capable speaker. If I were you, I would just drive it one way using one amp.

If I wanna add supertweeter, I would just use a cap and a L-pad to connect to the same amp.

At the moment, 4343 bass one way, mids and highs another one way, so two-ways altogether right now with super tweeters simply attached to the mids and highs. I’m thinking of adding another amp, using the third way to drive the super tweeters, and I’m wondering what amp would be suitable, if this is the right direction.

4343 go active and add supertweeter? Total 5 amps used?

Or 4343 one amp, supertweeter one amp? Using 2 way crossover?

(I am sure there are people driving supertweeter active but I don't see the need for my own system. I rather use a cap and LPad to drive it and spare crossover processing if I am to add supertweeter.)

最後修改時間: 2021-11-02 18:51:45

JBL4343 into 2 ways. So, in general, nobody drives their super tweeters active?

#263
WNW 兄：
Adding a 18k supertweeter active seems unusual.

May I know how many ways is your system? Perhaps the drivers used?

最後修改時間: 2021-11-02 18:19:10

HaHa兄，I’m using the R9 as an additional super tweeter, crossover point at 18kHz slightly overlapping the frequency of the existing tweeter. And, like Ben兄 said, this works fine and seems to be the usual practice.

However, I have two reasons to consider driving the R9 with a separate amplifier.

Firstly, I do have a spare channel on my DF-35 external crossover and it should handle the extra amp without problem. Although the R9 super tweeter is listed to have 97.5dB sensitivity, it is more like 91-2dB in real life, so having an separate amp would, in theory, drive it better and takes the strain off the existing amp.

Secondly, I talked to a veteran C-Hing who used to drive his super tweeters separately with a DIY solid state amp and, apparently, had excellent results, namely a massive increase in “air”. So I’m very intrigued to try, but don’t know if any amp out there which is particularly good at the high range of frequencies. In the same way, I’m always looking out for amplifiers that have a good presentation of the deep deep low end, something like the Goldmund Mimesis 29.4M, which I cannot really afford... yet.

I’m relatively new to the crossover game, do let me know if I’m thinking on the right track.

#258

i suppose the PT-R9 .... it may not be used for adding to a speaker with tweeter if for using at 5K range...

pt-r9 seem more suitable for someone build a width bandwidth speaker to use as a tweeter from 5k range..

how u use it ?

if anyone using that 5k to 120K tweeter, should think of implement it as a tweeter , not the implementation as those super tweeter from upper 16k to 200k things


think this way..a 3 ways speaker with PT-R9 as a tweeter from 5k..to 120K... or a 4 ways speaker with another super tweeter fro 13K to 120K

those are 2 different things

using a Pt-r9 with a speaker with existing tweeter and start from 5k range........seem difficult



haha

最後修改時間: 2021-11-02 11:48:49

＃258
我覺得原則上需夾其他路的效率增益，但其實我們聽唔到超高的細節，所以量對便可。

不過很少人超高獨立用電分。因可能加大了電分的工作量，得少於失。

明白。一般來講，係咪唔適合用膽機推超高音？因為膽機出唔到咁高？我主要想攞多啲空氣感。