Purifi PTT6.5X08-NAA-08 + Mundorf AMT U110W1.1

[Audiodesignguide.com]

I would like to share with you the my good experience with these drivers able to give extreme performances better than Ceramic drivers.

The distortion is considerably less than that present on my ceramic drivers and I'm not talking about something just measurable but a substantial improvement in listening.

The Purifi mid-woofer integrates perfectly with the AMT tweeter returning a fast and detailed mid-range with plenty of separation between the instruments.

I will share the complete project with a H-frame dipole subwoofer created with a normal pro 18" and active filter.

 

[Audiodesignguide.com]

Here the finished system.

 

[Audiodesignguide.com]

The PTT6.5X08-NAA-08 have an incredible low frequency dynamics and extension for a 6.5" that normally can only be achieved with an 8" so if used in a bass reflex configuration we can create a true full-range with a frequency range 50Hz - 20KHz without the subwoofer.

 

[kaameelis]

What are other conditions of ceramic vs. Pufifi measuremnts, how far from speakers was mic, is level actual level at measuring point or normalized?

 

[jccart]

which 18inch driver is that in the h frame how do you rate the sound from that one ?

 

[Audiodesignguide.com]

What are other conditions of ceramic vs. Pufifi measuremnts, how far from speakers was mic, is level actual level at measuring point or normalized?

about 1m

same output level and same position for both system

 

[Audiodesignguide.com]

which 18inch driver is that in the h frame how do you rate the sound from that one ?

I have used an old K.C.S. 18" S-1846 woofer with active filter to compensate the dipole

 

[Audiodesignguide.com]

Here the filter output and final result

 

[Audiodesignguide.com]

hole at 200Hz caused by my environment

 

[jccart]

how are those filters implemented. I'm slowly collecting parts to do this type of thing I e got loads of speakers a umik1 and now finally motu interface I just can't get my head round the software . what do you use please?

 

[Audiodesignguide.com]

The filters are the result of many and many measurements and listening with various chokes and various capacitors, I no longer waste time with simulations

I use Minidsp mic umik1 with Arta or REW and DATS for impedance

 

[jccart]

sorry I meant the filter on the sub . I thought you said it was actively implemented.

 

[Audiodesignguide.com]

I have simulated this filter with LTspice

 

[jccart]

so you made your own active crossover that's interesting wouldnt even know where to start

 

[Audiodesignguide.com]

n.	C1 (nF)	C2 = 2xC1	R1 and R2	C1 (F)	C2 (F)	F (Hz)
1​	150​	300​	3570​	0,000000150​	0,0000003​	210,0​
2​	150​	300​	4120​	0,000000150​	0,0000003​	182,0​
3​	150​	300​	4700​	0,000000150​	0,0000003​	159,5​
4​	150​	300​	5490​	0,000000150​	0,0000003​	136,6​
5​	150​	300​	6200​	0,000000150​	0,0000003​	120,9​
6​	150​	300​	7150​	0,000000150​	0,0000003​	104,9​
7​	150​	300​	8250​	0,000000150​	0,0000003​	90,9​
8​	150​	300​	9530​	0,000000150​	0,0000003​	78,7​

R1 1Kohm 1/4W 1%
R2 100Kohm 1/4W 1%
R3,R11,R19,R27 3570ohm 1/4W 1%
R4,R12,R20,R28 4120ohm 1/4W 1%
R5,R13,R21,R29 4700ohm 1/4W 1%
R6,R14,R22,R30 5490ohm 1/4W 1%
R7,R15,R23,R31 6200ohm 1/4W 1%
R8,R16,R24,R32 7150ohm 1/4W 1%
R9,R17,R25,R33 8250ohm 1/4W 1%
R10,R18,R26,R34 9530ohm 1/4W 1%
R40,R41 270ohm 1/4W 1%
R38,R39 3000ohm 1/4W 1%
R36 56Kohm 1/4W 1%
R35 3Kohm 1/4W 1%
R37 0ohm

C1,C2,C3.C4,C11,C12 0.15uF WIMA MKP
C5,C8 0.22uF WIMA MKP
C6,C7 470uF 35V
C9,C10 100uF 25V

IC1,IC2 NE5532
U$1 LM317
U$2 LM337

B1 diode bridge 1A

SW1,SW2,SW3,SW4 dip switch 8 way


Gerber and Eagle CAD files are available.

 

[jccart]

so cool !!! so it's not an active crossover as such you filter the signal to remove any frequency you choose by selecting a combination of different dip switches
you designed it and had a pcb made I'm guessing ?

 

[Audiodesignguide.com]

 

[jccart]

I can't open the last 3 what is the first image the crossover and amplifier setup you made ?

 

[Audiodesignguide.com]

you need Eagle cad to open these files but you can generate the pcb with the zip file.

 

[jccart]

could you give me a brief rundown of the project is it an inline filter or a crossover like 1in 3 out