10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

[buzzforb]

Here are the photos of the raw goods as well as the proposed box and baffle design. Will begin the measurement process after making the boxes in next few days. I will test with flat baffle and final baffle will be saved for finished product. It will be interesting to see what effect the baffle has considering the use of the waveguide. I will also inlcude a link to Dave's testing of another N26C on his waveguide.

https://plus.google.com/photos/101632266659473725850/albums/5830527846096875617?banner=pwa

[davepellegrene]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

Here are the photos of the raw goods as well as the proposed box and baffle design. Will begin the measurement process after making the boxes in next few days. I will test with flat baffle and final baffle will be saved for finished product. It will be interesting to see what effect the baffle has considering the use of the waveguide. I will also inlcude a link to Dave's testing of another N26C on his waveguide.

https://plus.google.com/photos/101632266659473725850/albums/5830527846096875617?banner=pwa

[ATTACH=CONFIG]43088[/ATTACH][ATTACH=CONFIG]43089[/ATTACH]

Looks like the beginning of a great project.

Dave

[lorenmjones]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

If the manufacturer's FR on that woofer is accurate, that is a really nice unit. That should be a very nice system. What kind of extension are you expecting from your MLTL?

[Pete Schumacher]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

Looks like the beginning of a great project.

Dave

No kidding.

In your opinion Dave, what's the lowest you'd cross that tweeter/guide combo?

[Greggo]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

+1 on the above question...

and to Buzzforb,

Would love to hear more about what drew you to those two drivers, if you have any crossover target in mind, and how that fits into your own criteria for speaker design, and any thoughts on 8 vs 10 vs 12 woofers in a design like this. Also love to hear some more about the waveguide you went with and your take on the pros/cons vs other options. I guess what it boils down to is that I am encouraging you not to hold back here and tell us more about your goals and objectives that led up to this pairing.

Very interested in this project and glad you started a thread on it.

[davepellegrene]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

No kidding.

In your opinion Dave, what's the lowest you'd cross that tweeter/guide combo?

That guide gives boost down to around 1.6 kHz. I'm not sure what is different about the X version then the A version but I could run distortion on the N26C A and give you a pretty good idea. Unless buzz can run them himself and post with the x version.

I'm wondering if a larger guide say 10" would boost down around 1 kHz and pair up real nice with the 10G40. Specs. Sure do look good.

Dave

[Pete Schumacher]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

That guide gives boost down to around 1.6 kHz. I'm not sure what is different about the X version then the A version but I could run distortion on the N26C A and give you a pretty good idea. Unless buzz can run them himself and post with the x version.

I'm wondering if a larger guide say 10" would boost down around 1 kHz and pair up real nice with the 10G40. Specs. Sure do look good.

Dave

If you look at the posted response of the N26C/G, it cuts off on its own at 1500Hz. Basically what you're saying is that you see the guide doing its job all the way to the tweeter cutoff. I don't think a larger guide will gain you much other than a different pattern response. It won't go any lower than its natural roll off.

That guide/tweeter would probably support a 1200Hz LR4 target, and according to the published data on the woofer, it could do the same. I'd like to see the project completed. It's got real chest pounding potential, if the tweeter can keep up.

[davepellegrene]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

If you look at the posted response of the N26C/G, it cuts off on its own at 1500Hz. Basically what you're saying is that you see the guide doing its job all the way to the tweeter cutoff. I don't think a larger guide will gain you much other than a different pattern response. It won't go any lower than its natural roll off.

That guide/tweeter would probably support a 1200Hz LR4 target, and according to the published data on the woofer, it could do the same. I'd like to see the project completed. It's got real chest pounding potential, if the tweeter can keep up.

Looking at my flat baffle polar I figured it could get to 1.0 kHz


Dave

[davepellegrene]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

Here is the on axis response from Transducer Labs site on the A/G version
It looks like the natural roll off is 1.0 kHz

http://www.transducerlab.com/media/3...13ffffa126.pdf

Dave

[Pete Schumacher]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

Here is the on axis response from Transducer Labs site on the A/G version
It looks like the natural roll off is 1.0 kHz

http://www.transducerlab.com/media/304c64dfcbf26a23ffff8013ffffa126.pdf

Dave

That's the N26CR.

The C/G is here.

http://www.transducerlab.com/media/eab5a0aa8566f0cffff804effffa126.pdf

[davepellegrene]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

That's the N26CR.

The C/G is here.

http://www.transducerlab.com/media/e...4effffa126.pdf

Good catch!
My polar looks closer to the N26CR.
So I did a little research and here is the difference.
Taken from the website;
This is a limited edition version of the popular ceramic dome tweeter. This version has a different type of epoxy holding the dome assembly which gives the tweeter a 10% lower fs and a slightly lower SPL. There are 70 units available at this special price.


Dave

[buzzforb]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

]IT builds confidence to see the big dogs wandering around. Idea is largely the result of Pete's 8BG51 thread and my desire to build my brother a monitor/bookshelf that would go toe to toe with the likes of the JBL LS series and other high end monitors. He has a relatively small room so it is my hope that this woofer in a well executed TL cabinet will give us all the bass we want. The 10g40 has a pretty good reputation as a snappy woofer and that is what I am hoping for. Quick and punchy. THe TL labs N26C is probably what I am most excited about. Clean, well made tweeter with well regarded reputation and motor/design to back it up. All measurements seem to point to excellent performance and that is what I am expecting. The model I purchased gives up about 1dB of sensitivity for lower Fs. I got it because it was available. 1.2K x-over for the 10g40 should be no problem from what info I have. I am new to this level of design, so any help is appreciated. Got all the gear, but have to get everything setup. DSP will be used to rough xover points. I will be picking up Bagby's PCD and running with it to the best of my ablilties. I will post pics of test boxes by weekend if all goes as planned. Hopefully measurements follow soon after. Tweeters are very well matched so lets hope the woofers show a similar likeness. You fellows suggest running the woofers in with a test tone to break them in a bit for taking final TS parameters. IF they ar remotely close, should work fine in the box as it is pretty flexible. Questions to come.

[buzzforb]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

Any opinions on rear vs bottom port considering the tuning of this particular box. The speakers will be away from the wall about 3-4 feet, so rear port should not be a problem, but a bottom port might offer some tuning options if you make speaker spikes that allow LF tuning with speaker stand top.

[buzzforb]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

Little update. Got the boxes put together for the woofers. Didnt get to the tweeter holes. Sounds good with a roughed out DSP crossover. Crossing at 1500. Beyma has absolutlely no problem going that high. Waiting on a UMIK-1 mic, as I wanted to try it over the Berhringer, especially considering the USB connectivity. Will try to get measurements next weekend. Bass is definitely not an issue and the tweeters are clean and crisp. Cant tell too much at this point, but hopefully it will progress quickly.

[Pete Schumacher]

Re: 10G40 MLTL, Transducer Labs N26Cx-A/ Pellegrene waveguide

Little update. Got the boxes put together for the woofers. Didnt get to the tweeter holes. Sounds good with a roughed out DSP crossover. Crossing at 1500. Beyma has absolutlely no problem going that high. Waiting on a UMIK-1 mic, as I wanted to try it over the Berhringer, especially considering the USB connectivity. Will try to get measurements next weekend. Bass is definitely not an issue and the tweeters are clean and crisp. Cant tell too much at this point, but hopefully it will progress quickly.

Are you making a baffle to go over the enclosure and cover that woofer flange or is the baffle to be cut away along those facet lines?