TPAM10HT (see also the TPAM10HTL) 
Monday, September 5, 2011, 21:13
Posted by Anders
Upon request i have now designed my first true sub intended for home theater use, or as a complement to stereo speakers typically reaching down to approx 50Hz.

If this design and application is something you are looking for I strongly recommend that you take a look at the TPAM10HTL, which was developed shortly after the TPAM10HT, it offer significant benefits apart from not reaching the 20Hz marker.

As usual I got a lot of help from my friend Johannes Rodin who also helped me out on the THAM series designs.

The TPAM10HT design principle, lovingly referred to as "tapped pipe" allows for relatively compact outer dimensions while still reaching it's goal of simulated in room 20Hz reproduction.

TPAM10HT contains a lot of compromises in order to reach it's performance with approx 80 liters of system volume, one of which is the driver depth (max 120mm), the other is the sound pressure level, even if i believe it should be sufficient for most users.

The TPAM10HT has been simulated in all positions and with two drivers i found to be of interest, but there might be more suitable drivers out there.

Please note that I can't answer questions regarding the suitability of these other drivers, no disrespect intended but I simply do not have the time, instead please use hornesp. and the data provided here to find your best candidate.

This is the TPAM10HT :









The cutout geometry shown in the drawings above is tailored for this driver :

Product Line: Peerless Gold
Model Number: XLS-P835028

Be aware of this if you choose to go for another driver.

TPAM10HT system volume and principle :


Simulation results for the Peerless XLS-P835028 at 1W & 1m :

XLS-P835028 When positioned in a corner:


XLS-P835028 When positioned along a wall:


XLS-P835028 When positioned freely on the floor:


XLS-P835028 Electrical impedance:


XLS-P835028 Cone excursion:


XLS-P835028 Group delay:


XLS-P835028 Impulse response:



I also found the B&C 10NW64 to be a candidate, below you will
find the simulation results for the B&C 10NW64 at 1W & 1m :


B&C 10NW64 When positioned in a corner:


B&C 10NW64 When positioned along a wall:


B&C 10NW64 When positioned freely on the floor:


B&C 10NW64 Electrical impedance:


B&C 10NW64 Cone excursion:


B&C 10NW64 Group delay:


B&C 10NW64 Impulse response:


These are my recommendations for now, they will both fit in the TPAM10HT but please note that the cut out geometry specified in the drawings are tailored for the Peerless XLS-P835028, so some adjustments might be necessary if you go for the B&C 10NW64.

If the driver of your choice (outside of those above) can't be fitted within the 120mm depth restriction the box may be widened, but doing this will void any of the results above and I would strongly recommend a simulation prior to build.

This design has not been built and tested in real world conditions yet, results will be posted when this has been done.

Finally some build pictures :


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