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newbie looking for advice.

 
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harry h
Junior Contributor 20+


Joined: 15 Oct 2004
Posts: 24
Location: Kapiti coast. New Zealand

PostPosted: Fri Oct 15, 2004 9:19 am    Post subject: newbie looking for advice. Reply with quote

Hello all. My name is Harry, and I live in New Zealand,and I have just discovered this wonderfull site and was hoping some of you may be able to help me with a couple of queries. I am in the process of building a pair of T Line speakers for one of my sons using a B139,B110,T27 and DN12 combination.

Just for a bit of background information, I have built a couple of pairs of Bailey T lines in the past ( 25 years ago) but the current project is of my own design staying within the parameters found on the transmission line speakers website, and I have just completed another set of t lines also of my own design for my other son using drivers from a pair of Audio Monitor 9s with very satisfactory results.

Now for the queries. Firstly, I would like to mount the drivers in the baffle in such a way that the voice coils are aligned front to back so to speak, I think they call this time allignment,but I may be misinformed. What I need to know is do the same rules apply for the B139 being a flat diaphragm as for a conventional cone driver.

The second question is , is there an easy upgrade to the DN 12 regarding the hump in the frequency response around the 1 to 4 khz as I find this tends to harden vocals and guitar to some degree, or do I have to import a relacement crossover from the likes of Falcon whichI found elsewhere on this site.

I am hoping some of you may be able to point me in the right direction .

B T W great site, I have picked up a wealth of info already, keep up the great work.

cheers H H
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ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Fri Oct 15, 2004 3:08 pm    Post subject: Reply with quote

First question

Yes - ~65mm, ~52mm & ~10mm for a time aligned B139B, B110, T27 combination.
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harry h
Junior Contributor 20+


Joined: 15 Oct 2004
Posts: 24
Location: Kapiti coast. New Zealand

PostPosted: Fri Oct 15, 2004 6:49 pm    Post subject: Reply with quote

ColinR wrote:
First question

Yes - ~65mm, ~52mm & ~10mm for a time aligned B139B, B110, T27 combination.


Excellent, thankyou Colin
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ian t
Junior Contributor 10+


Joined: 16 Jul 2004
Posts: 15
Location: Australia

PostPosted: Sun Oct 17, 2004 7:42 am    Post subject: Re: newbie looking for advice. Reply with quote

The second question is , is there an easy upgrade to the DN 12 regarding the hump in the frequency response around the 1 to 4 khz as I find this tends to harden vocals and guitar to some degree, or do I have to import a relacement crossover from the likes of Falcon whichI found elsewhere on this site.

It's worth trying a simple zobel network a la KEF CS7/CS9 crossover(eg.10uf cap & 10ohm 10w resistor in series) This network wired in parallel with the B110 will smooth the upper midrange response quite noticeably.
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harry h
Junior Contributor 20+


Joined: 15 Oct 2004
Posts: 24
Location: Kapiti coast. New Zealand

PostPosted: Sun Oct 17, 2004 8:15 am    Post subject: Reply with quote

Thanks Ian, I will certainly give that a try.

Cheers

Harry
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harry h
Junior Contributor 20+


Joined: 15 Oct 2004
Posts: 24
Location: Kapiti coast. New Zealand

PostPosted: Tue Nov 09, 2004 9:24 am    Post subject: All finished Reply with quote

Well, they are all done bar painting and I am most happy with the results.
Thanks verry much to Colin R and Ian T for your input, your advice and answers were taken seriously and put to use.
A picture and more detailed description are available under personal treasures on Terrys site.
Once again, thanks for all your help
Cheers
Harry
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