TPL150 DIY

[studiotech]

Thanks for all of the great information you guys! I have my next project. Good thing we made the back removable. I have easy access to pull the rear chamber off while leaving everything pretty from the front.

[ramallo]

Originally Posted by studiotech

Thanks for all of the great information you guys! I have my next project. Good thing we made the back removable. I have easy access to pull the rear chamber off while leaving everything pretty from the front.

Wow!, nice studio speakers.

[studiotech]

Originally Posted by ramallo

Wow!, nice studio speakers.

Thank you. I added another for ya! I made a thread for these when we first created them a few years ago, but myself and the engineer at the studio have always felt that there was something going on around 1.5-2KHz that stood out compared to the rest of the range. We even did a little dip in the response there like an old school BBC thing but it still bothered me. We are crossing at 1.85KHz and steep 48dB/oct. I never understood how anyone could use them down to 1KHz like so many people mention. Do they not hear the straining sound? The slight harshness to vocals?

Greg

[ramallo]

On my loudspeakers I crossed them 2,2kHz (tweeter high pass) (passive 2º order). I'm using this speakers for mastering and mixing. I'm very happy with them.

This is the freq resp and distortion

[studiotech]

Originally Posted by ramallo

On my loudspeakers I crossed them 2,2kHz (tweeter high pass) (passive 2º order). I'm using this speakers for mastering and mixing. I'm very happy with them.

Ok, so you crossing higher. What size woofer is that?

Greg

[ramallo]

Originally Posted by studiotech

Ok, so you crossing higher. What size woofer is that?

Greg

Is a 12" from JBL (One of the woofers with less distortion of the market)

[studiotech]

Pictures? I'm greedy. I wanna see more....

[ramallo]

Originally Posted by studiotech

Pictures? I'm greedy. I wanna see more....

Here

[studiotech]

Very nice. Thank you.

You might want to consider some better internal material than the "acoustical" foam. You made a nice heavy box AND used the rubber damping for vibration, but what about the soundwaves inside the cabinet? Either 2" rigid fiberglass or even better, some type of product like Bonded Logic. We use this in all speakers and all around the studio for absorption. Works great and no itchy stuff like the rigid fiberglass.

Bonded Logic - Construction Products - UltraTouch Denim Insulation

It absorbs far more of the back wave of the woofer than the foam, generally resulting in a more clear midrange. Especially since you are taking it all the way up to 2.2KHz passive at 12dB. That means there is still significant output up to and above 5KHz coming from the JBL.

Not too scientific, but if you talk into your cabinet through the woofer hole the way it is and then swap the other cabinet for the better material, I think you will notice the new version is much more dead inside.

[studiotech]

Lgrau, any more picts of the whole system? Thanks.

Greg