proac 2.5 clone problem

小弟買咗對囯產 proac 2.5 clone speakers.  發覺都有以下特點：“。。。。易推, 粗聲, 底音失控, 高中底出來無連貫性...”

請教各位高手應如何處理

多謝

I have experience to listen  REAL and Clone 2.5 at same config same environment.

Let share some idea for you.

Real 2.5 Tweeter not equal to Fake one.
Woofer is same.

You may need:
1. Download and study the cross over network of REAL 2.5
2. Plotting your frequency response (without crossover network of Tweeter and Woofer), using the RMAA software.
3. Modify the crossover.
4. For the wooden cabinet, you need to put some coat inside.

KK.

I have experience to listen  REAL and Clone 2.5 at same config same environment.

Let share some idea for you.

Real 2.5 Tweeter not equal to Fake one.
Woofer is same.

You may need:
1. Download and study the cross over network of REAL 2.5
2. Plotting your frequency response (without crossover network of Tweeter and Woofer), using the RMAA software.
3. Modify the crossover.
4. For the wooden cabinet, you need to put some coat inside.

KK.

KK Thanks a lot for the reply.

How can I tell the tweeter and woofer are real or not.  They have the SCAN-SPEAK labels.  The model number of the tweeter is D2010/851300; and woofer is 18W/8535-00.

I believe the crossover network is "Troels Gravesen 设计的第6 版本".

C hing, the best I can do for now is to change the caps to SOLEN caps; and add the sound-absorbing sponge inside.

The rest I don't know how to handle.  Please advise.

Thanks a lot,
Raymond

For me, I will not use Solen Cap.

Hi KK,

You are 7-star captain.  I'm just a newbie.  Still a long way to go.

BTW, where can I get the RMAA software?

raylam,

http://www.hififever.com/discuz/ ... &extra=page%3D1

We will planning the course (3 hour) for using RMAA measuring on Preamp, & Loudspeaker + Home measuring.

KK

回復 7# kk_ho


KK Sir,

 我有興趣參加

夠十個, 即開

2 個價錢, 一個連埋 USB ext sound. 一個價不連 USB Ext sound.

Topic:
1. Setup
2. Measurement for Pre-amp
3. Measurement for Loud speaker frequency response
4. Measurement for Room acoustic.

KK.HO

KK sir,

I have done the sound-absorbing sponge, using the 1吋雞旦綿。

replaced with the solen caps, and change the lead wires.

I still found that the bass (I think around 50 to 150 hz) is still too heavy.  What would you recommend to change the CO network to reduce the bass.  The CO network is version 6.0.

Thanks a lot.
Raymond

Raylam,

Please post your crossover network here. And I don't suggest to use 雞旦綿

Hi KK sir,

Here is the diagram:

http://www.flickr.com/photos/43769545@N02/4586540080/

Thank you.
Raymond

Raylam,

Nothing special on the picture, seem normal.

BTW, do you have CAR, may be I can take my 2.5 (clone) for you to AB comparision?

KK.Ho

Oh, KK sir,

Thank you so much for your kind support.  I don't have a car.  I think I can do trial and error to "minimize" the problem for now.  I think one of the reasons is that the tube for the reflex is too long.  I sounds like it is some kind of resonance in the reflex tube.   I had put a 雞旦綿 tube into the reflex tube.  I also changed the quad EL34 from EH to Gold Lion.  Now the bass has decreased to a reasonable level (although a little bit heavier, but the listening is more comfortable than before).  

I will run it for a while for now.  The next step is to modify the CO to 6.2  version which is, theoretically, to pull down the bump (at 750 Hz).  See how it goes.

Thank you so much.

What is the price for the measurement course?

thanks,
Raymond