Vifa PW17J in a TL enclosure

ashok · 19th February 2003, 02:04 AM

Has anyone used a Vifa PW17J in a transmission line enclosure. I have the shielded version and was planning on making a TL and using a PT2 planar tweeter.
I have bought Dacron ( called Racron over here ) fiber used in pillows. It looks like a suitable material. The only other absorbent that I can get here is silk cotton and fiber glass wool.

Any suggestions will be very helpful.
Thanks.

timc · 19th February 2003, 02:20 AM

Hi Ashok,

I have built a pair of TLs using the a single VIFA P17WJ-00-08 and D26TG-35-06 Tweeter. I have been using them for over a year now and am happy with them.
I am just now veneering them (like right now!).

I used Dacron also. It comes both loose and in a batting.
I found the batting much easier to work with.

Regards,
Tim

ashok · 19th February 2003, 02:40 AM

Hi Tim,
The cabinets look great. I wish I could get that shade of veneer here.
I plan to place the P17WJ right on top and fix the planar tweeter outside the box. I remember that years ago , I tried using dome tweeters outside the box and they sounded much better. More airy ! So in view of that I will fix this one on top.
Could you post some cabinet dimensions with details of the baffle.
I currently have another pair of P17WJ's in a vented box (20L).
The bass is quite good. Does the TL you built go low enough that you do not need a sub - at normal listening levels ?
I would like to see the crossover details.
Thanks.

timc · 19th February 2003, 02:53 AM

Yes, I am very happy with the way the veneer turned out (my first time)!
I do not have any measuring equipment, but I am very happy with the bass and overall sound. It does not have HEAPS of bass, but quite enough to suit my taste.

The outside dimensions are 1000H x 200W x 300D, 18mm MDF used for the outer walls and 12mm MDF used for the inner baffles/bracing. The line is set for about 40Hz with the driver offset 1/5 from the start of the line.

Attached is a pic inside the line while under construction.

Regards,
Tim

timc · 19th February 2003, 02:58 AM

Take2 for the pic...

timc · 19th February 2003, 03:06 AM

Sorry I missed your question about the crossover.
I used the Rod Elliott Passive crossover article (http://sound.westhost.com/lr-passive.htm) and chose a crossover freq=3000Hz.
This is only temporary though (mounted externaly) as I intend to bi-amp.

Regards,
Tim.

ashok · 19th February 2003, 03:57 AM

Hi Tim,
Did you use MDF for those neat looking rounded corners?
I can see that there are several slits in it to help in bending the sheet. Did you use PVA based glue. I see some pale coloured material at the joints.
Thanks.

timc · 19th February 2003, 05:44 AM

Hi Ashok,

The rounded corners are MDF. It is called 'Kerfing', I read it in the Triton Work Bench manual and just had to try it! Basicaly you just make cuts at about 10mm intervals almost the full depth of the material and then it should bend ok for fairly gradual radius.

I did use PVA glue. The lighter colour material you see is 'Expander Foam' that I used to fill the spaces behind all the curves.

Regards,
Tim

ashok · 19th February 2003, 05:55 AM

Hi Tim,
Thanks for the clarification.
I was interested in bass extension rather than 'heaps' of bass.
The TL is supposed to go down lower than any other enclosure for a particular driver. I hope I have got that right.
I will make out some plans and post it. I'd like to get some opinions before I actually build it. I was planning on using cardboard to make those round corners and filling the hollow with sand and epoxy mix. I was also wondering if the standard Thermocole ( expanded cellular white plastic) could be used. It cannot be an absorbent at low frequencies.
Cheers.

Andypairo · 19th February 2003, 06:56 AM

I an also interested in building a TL with P17Wj (actually with 2 of them..), but I never played with transmission lines before...

What did you use to calculate dimensions, line length, etc?

Cheers

Andrea

19th February 2003, 02:04 AM	#1
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Vifa PW17J in a TL enclosure Has anyone used a Vifa PW17J in a transmission line enclosure. I have the shielded version and was planning on making a TL and using a PT2 planar tweeter. I have bought Dacron ( called Racron over here ) fiber used in pillows. It looks like a suitable material. The only other absorbent that I can get here is silk cotton and fiber glass wool. Any suggestions will be very helpful. Thanks. __________________ AM

19th February 2003, 02:40 AM	#3
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Wow! Looks neat. Hi Tim, The cabinets look great. I wish I could get that shade of veneer here. I plan to place the P17WJ right on top and fix the planar tweeter outside the box. I remember that years ago , I tried using dome tweeters outside the box and they sounded much better. More airy ! So in view of that I will fix this one on top. Could you post some cabinet dimensions with details of the baffle. I currently have another pair of P17WJ's in a vented box (20L). The bass is quite good. Does the TL you built go low enough that you do not need a sub - at normal listening levels ? I would like to see the crossover details. Thanks. __________________ AM

19th February 2003, 03:57 AM	#7
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Box corners Hi Tim, Did you use MDF for those neat looking rounded corners? I can see that there are several slits in it to help in bending the sheet. Did you use PVA based glue. I see some pale coloured material at the joints. Thanks. __________________ AM

19th February 2003, 05:55 AM	#9
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	The bass response Hi Tim, Thanks for the clarification. I was interested in bass extension rather than 'heaps' of bass. The TL is supposed to go down lower than any other enclosure for a particular driver. I hope I have got that right. I will make out some plans and post it. I'd like to get some opinions before I actually build it. I was planning on using cardboard to make those round corners and filling the hollow with sand and epoxy mix. I was also wondering if the standard Thermocole ( expanded cellular white plastic) could be used. It cannot be an absorbent at low frequencies. Cheers. __________________ AM

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19th February 2003, 02:53 AM	#4
timc diyAudio Member Join Date: Aug 2001 Location: Melbourne/Australia	Yes, I am very happy with the way the veneer turned out (my first time)! I do not have any measuring equipment, but I am very happy with the bass and overall sound. It does not have HEAPS of bass, but quite enough to suit my taste. The outside dimensions are 1000H x 200W x 300D, 18mm MDF used for the outer walls and 12mm MDF used for the inner baffles/bracing. The line is set for about 40Hz with the driver offset 1/5 from the start of the line. Attached is a pic inside the line while under construction. Regards, Tim

19th February 2003, 03:06 AM	#6
timc diyAudio Member Join Date: Aug 2001 Location: Melbourne/Australia	Sorry I missed your question about the crossover. I used the Rod Elliott Passive crossover article (http://sound.westhost.com/lr-passive.htm) and chose a crossover freq=3000Hz. This is only temporary though (mounted externaly) as I intend to bi-amp. Regards, Tim.

19th February 2003, 05:44 AM	#8
timc diyAudio Member Join Date: Aug 2001 Location: Melbourne/Australia	Hi Ashok, The rounded corners are MDF. It is called 'Kerfing', I read it in the Triton Work Bench manual and just had to try it! Basicaly you just make cuts at about 10mm intervals almost the full depth of the material and then it should bend ok for fairly gradual radius. I did use PVA glue. The lighter colour material you see is 'Expander Foam' that I used to fill the spaces behind all the curves. Regards, Tim

19th February 2003, 06:56 AM	#10
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	I an also interested in building a TL with P17Wj (actually with 2 of them..), but I never played with transmission lines before... What did you use to calculate dimensions, line length, etc? Cheers Andrea

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