Hello All,
I am ready to order a driver that will run between an AE TD18 and a Beyma TPL-150/H. I have decided that a single 12 (or a 10” if I came across an amazing one that was in the ~100dB sensitivity range that can excel in my design frequency range up to, say, 1,600 – 2,000 Hz meets my goals with the fewest compromises.
I was ready to go with the Beyma 12P80ND/V2, which is well regarded mid-bass/mid driver, however its Qts of 0.15, Fs = 45 Hz, results in an F3 in a sealed box of 212Hz at a Qtc of 0.7. I am concerned that the system may sound better with a crossover frequency well below this.
In a recent thread, LineSource quoted Dr. Geddes:
“The mains should be designed for the best possible direct field with as flat a power response as possible. Equalization of the mains could only make them worse.”
A different alignment could go lower, but I would be concerned about transient response, size and complexity.
So, if I want the option to cross in the 100 – 120Hz range, are my better options more in the realm of the Faital Pro 12PR300? F3 at a Qtc of 0.7 is ~ 100Hz. If so, is the Faital Pro the best (or only) option for this role?
TIA
I am ready to order a driver that will run between an AE TD18 and a Beyma TPL-150/H. I have decided that a single 12 (or a 10” if I came across an amazing one that was in the ~100dB sensitivity range that can excel in my design frequency range up to, say, 1,600 – 2,000 Hz meets my goals with the fewest compromises.
I was ready to go with the Beyma 12P80ND/V2, which is well regarded mid-bass/mid driver, however its Qts of 0.15, Fs = 45 Hz, results in an F3 in a sealed box of 212Hz at a Qtc of 0.7. I am concerned that the system may sound better with a crossover frequency well below this.
In a recent thread, LineSource quoted Dr. Geddes:
“The mains should be designed for the best possible direct field with as flat a power response as possible. Equalization of the mains could only make them worse.”
A different alignment could go lower, but I would be concerned about transient response, size and complexity.
So, if I want the option to cross in the 100 – 120Hz range, are my better options more in the realm of the Faital Pro 12PR300? F3 at a Qtc of 0.7 is ~ 100Hz. If so, is the Faital Pro the best (or only) option for this role?
TIA
I am concerned about the transient response of a ported speaker in this (or any) frequency range. What are the specs of the cabinet and port were you thinking about?
Why does this matter if you are multi amping?
For what it is worth, this calculator says that the Beyma is more efficient (98.6 vs. 96.1)
If you wanted more sensitivity, you could order the 4ohm version of the FAITAL PRO 12PR300
EDIT - this calculator here
mh-audio.nl - Home
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Higher efficiency speakers offer more flexibility with regard to amplifier choice.
The Beyma's outpuin a sealed box,t at 120 Hz, for example, would be well below this sensitivity value.
I am interested in efficiency - I used a sensitivity spec because the efficiency spec is not familiar to most, I would guess.
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I see.
OK, so you're seeking:
- 12"
- flat 120-1600Hz
- moderate Qts for sealed box
...but I think that limits you to an efficiency of about 95dB rather than 100dB.
Maybe this will help?
Resources - Woofer Selection Guide
Grab that list of all their woofers, paste the table into a spreadsheet, then sort the sheet by driver size, efficiency and Qts.
e.g. this one looks like a possibility:
Amazon.com: SELENIUM 12MG1400 Mid Bass Woofer: Car Electronics
...but the efficiency calculates to 'only' 95dB.
The Faital 12PR330 also looks right and has about the same efficiency.
Putting the Beyma 12P80Ndv2 into a medium sealed volume(0.3-0.4cuft) with an active bass transform, like the Linkwitz Transform, would allow you to set the final -F3 down to 100-120Hz if you desire. The 12P80Nd spec's Xmax=7.5mm and AES power = 700 watts, so as long as you stay well above the Fs=45Hz, you should get a smooth boost.
For the "under 200Hz" effects.... you will also need to consider baffle step compensation options plus room placement compensation for in-room vs. against-wall placement. This will demand a more complex crossover. If you desire the highest efficiency midrange, the woofer typically supplies a shaped boost in the 100-200Hz to smooth the baffle step. Otherwise both the mid and tweet need to be attenuated above the cabinet baffle step frequency.
If you want to use a simple crossover DSP shape(LR2/BW3) at 100-120Hz, both the Faital 12PR300(300W) and 12FH520(600W) get good reviews in EconoWaves.
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