Building a Full-Range BMR (TEBM46C20N-4B) Enclosure

[panson_hk]

I purchased a pair of TEBM46C20N-4B BMR full-range drivers from PE long ago and put them aside. I finally got time to take action putting them in a box. I found sutiable box online. This is a plain box with a port as shown below. The net internal volume is around 1 L.

I measured each driver's free-air and delta mass (1 g) impedance for deriving TS parameters. I used them in EnclosureShop of LEAP simulation software to see how the box alignment for the existing port. TSL model of ES was used. The second graph shows SPL of 1 W and 20 W. No filling in the box was assumed. The alignment as shown is not perfect, but not too bad. The peak disappeared for rated input power. I will check the result against measurement.

 

[panson_hk]

I used a 60 mm holesaw to open mounting hole. The edge of the hole is chamfered at bit for good air flow. Foam gasket was placed surrounding the chassis to avoid air leak. The box was finished as shown.

 

[vacuphile]

Hi Panson,

I think you used an interesting driver and your case looks great. Can you please share with us how they sound?

 

[borispm]

Hi Panson,

Apparently there's not too much bass in these guys, think it's worth the effort to do a bass reflex or should I just add a woofer?

 

[panson_hk]

Hi Panson,

I think you used an interesting driver and your case looks great. Can you please share with us how they sound?

Mid-high is okay. Not happy with lacking of bass making overall sound unbalanced.

 

[panson_hk]

Hi Panson,

Apparently there's not too much bass in these guys, think it's worth the effort to do a bass reflex or should I just add a woofer?

I added a passive radiator to the box shown in post #1. The passive was optimized for another project. The tuning is too low for the box.

Image below shows simulated (solid) and measured near-field (dash) SPL.

 

[borispm]

I added a passive radiator to the box shown in post #1. The passive was optimized for another project. The tuning is too low for the box.

Image below shows simulated (solid) and measured near-field (dash) SPL.

I'm thinking bout trying either the TEBM46C20-4 or the newer TEBM35C10-4 with a woofer/bass module for a wide dispersion setup. Think I can get away with the anaemic bass by Xing at 200Hz?

 

[panson_hk]

I'm thinking bout trying either the TEBM46C20-4 or the newer TEBM35C10-4 with a woofer/bass module for a wide dispersion setup. Think I can get away with the anaemic bass by Xing at 200Hz?

Yes, good idea.

I am using Tymphany low-profile woofer to take care bass. http://www.diyaudio.com/forums/mult...tem-based-peerless-gbs-series-woofer-bmr.html

 

[borispm]

Yes, good idea.

I am using Tymphany low-profile woofer to take care bass. http://www.diyaudio.com/forums/mult...tem-based-peerless-gbs-series-woofer-bmr.html

Wow mate you're really dedicated! I have thought about the GBS as well but realise it may be an overkill... Thinking about utilising my spare TC9FD, cross at 300-400Hz, bring them down to ~100Hz, either use my miniDSP or add a subwoofer.