High excursion aluminium diaphragm woofer with inverted surround.

[Windforce85]

Thanks for information! Could you show us just one image? 🙂

Massive single resonance at 3,5 kHz.

Sounds good to me - indicates yet stiff (in regards to officially published data) moving subsystem which behaves like a piston in broad operational range.

Max useable frequence is 300 Hz.

Why 300Hz?

Good subwoofer driver.

Fuly agreed! If properly treated it could esily serve as a midwoofer.

 

[Zvu]

I'm guessing because of the rising distortion. It does look like it has regular pole piece with no copper in it. That works fine up to 300/400Hz but further up i'm not sure. Also, 4 layer coils tend to have quite high Le and Mms, that also doesn't help for transients in mids.

Line array of 6 or 8 per side would be something i'd try if i was in the mood to demolish my system and start all over again 🙂

 

[Windforce85]

I'm guessing because of the rising distortion. It does look like it has regular pole piece with no copper in it. It works ok up to 300/400Hz but further up i'm not sure. Also, 4 layer coils tend to have quite high Le and Mms, that doesn't help also.

OK. I will check how they behave as they will arrive in a couple of days.

 

[heinz1964]

As ZVU points out, the high mass and Le makes the frequency response drop after 100 Hz and the distortion is around 1% or more from the lower midrange

 

[Adam Bernau]

Thanks! The closest competitor was TLBL's option of Reckhorn D-165 which also was pleasingly cheap, has good midrange extension and is available in Europe, I will seriously consider it in smaller designs.

It seems that SW26DAC76-3-DV wins by a far margin, first attachment shows sims for three 7" woofers - red is Reckhorn, green is Anarchy, Blue is Tymphany SBS160F35AL. Reckhorn can provide the same bass efficiency in considerably smaller enclosure (6 dm3 vs 10 dm3) than Tymphany and Anarchy woofers. It is visible on first graph where dB per Watt dotted lines are placed closest to each other in the bass range. Unfortunately it will run out of steam becouse 80W per driver RMS power rating is exceeded. In turn, Anarchy will not be able to fully stretch its wings in this cabinet size and when pushed, it will also jump over the rated RMS power (higher drive levels are not shown, they are brought to the same SPL level). Series vs parallel connection of woofers pairs is irrelevant from power consideration, only from driving voltage.

#2 simulation shows blue and green channels swapped for single SW26DAC76-3-DV woofer. This insane driver will start the game already at 6 dm3 (!) providing even better power efficiency than a pair of Reckhorns in the same cabinet space and also the same SPL at lower cone travel (but its red graph is covered by green on the first diagram). Changing cabinet size to 10 dm3 ends with +6dB SPL gain at the power usage of pair of Reckhorns and utiliziation of full cone excursion under moderate drive voltage.


SB woofer wins heavily also in category displacement per driver's weight and is a bit worse in displacement per dollar as Reckhorn.

Can i ask you, what software are you using for this simulations? Looks quite qood. Thanks!