I'm building a pair of speakers for my computer room. Design criteria are that they need to be compact (to be stand mounted), extend below 100Hz, and have a perception of high quality and high SQ. The goal is essentially a "micro monitor," to which the Dayton ND series fits the bill well.
I chose the ND91 because it works well in the tiniest of boxes and still has decent high end. The PE 0.04cuft knock-down cabinets are a decent volume that work well for the driver. I paired this with the 1"x4" round port, which was a sacrifice of convenience. Ideally the cabinet would be a little larger to be able to accommodate a slightly lower tune, but oh well it still accomplishes the project goals of LF below 100Hz. The flat packs along with a 1"x4" port put the tune near 100Hz, which modeling shows to have a peak around 100Hz. If I went sealed, the -3dB point would be up in the 120-150Hz range and I am afraid that wouldn't be adequate for a good, low, crossover to my computer sub (JL 8W7 in 1cuft sealed). I'm hoping for a 80 or 90Hz crossover point.
I quickly ran through Response Modeler and PCD to see what the response would look like using traced manufacturer data. I sized a simple LCR contour filter that decently flattens the response while factoring in the baffle, making it a proper single driver full range speaker, but I plan to forego this and just use 12-band EQ on my computer along with measurements to do the final tweaking.
Here are my measured T/S for the ND91-8 using DATS:
Re 7.47 Ohms
Fs 94.88 Hz
Qes 0.533
Qms 5.304
Qts 0.484
Le@1k 1.304 mH
Mms 4.617 g
Vas 0.028 cuft
I chose the ND91 because it works well in the tiniest of boxes and still has decent high end. The PE 0.04cuft knock-down cabinets are a decent volume that work well for the driver. I paired this with the 1"x4" round port, which was a sacrifice of convenience. Ideally the cabinet would be a little larger to be able to accommodate a slightly lower tune, but oh well it still accomplishes the project goals of LF below 100Hz. The flat packs along with a 1"x4" port put the tune near 100Hz, which modeling shows to have a peak around 100Hz. If I went sealed, the -3dB point would be up in the 120-150Hz range and I am afraid that wouldn't be adequate for a good, low, crossover to my computer sub (JL 8W7 in 1cuft sealed). I'm hoping for a 80 or 90Hz crossover point.
I quickly ran through Response Modeler and PCD to see what the response would look like using traced manufacturer data. I sized a simple LCR contour filter that decently flattens the response while factoring in the baffle, making it a proper single driver full range speaker, but I plan to forego this and just use 12-band EQ on my computer along with measurements to do the final tweaking.
Here are my measured T/S for the ND91-8 using DATS:
Re 7.47 Ohms
Fs 94.88 Hz
Qes 0.533
Qms 5.304
Qts 0.484
Le@1k 1.304 mH
Mms 4.617 g
Vas 0.028 cuft