Vifa TC9FD18-08 best bang for the buck - diyAudio
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Old 26th January 2015, 08:34 AM   #1
pnix is offline pnix  United States
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Default Vifa TC9FD18-08 best bang for the buck

Hi,

Measurements shown here and elsewhere suggest that the Vifa TC9FD18-08 currently seems to be the best bang for the buck. Far better performance than drivers that cost a lot more.
Transducer Detail | Tymphany

Like any small driver it starts to distort at low frequencies and is limited in output though.

In what type of enclosure would the driver work best if paired with a subwoofer? The goal would be to achieve low frequency extension to about 80Hz. What SPL can be expected?

Is this even a viable option or would a FAST configuration be a better fit?
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Old 26th January 2015, 10:30 AM   #2
Mayuri is offline Mayuri  Finland
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I think you can pull off LF of 80Hz from this, but I recommend you cross it higher. Maybe aperiodic enclosure or short TL would work?

Personally, I'm going for around 350Hz XO in my project: FAST with TL?
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Old 26th January 2015, 11:12 AM   #3
sayrum is offline sayrum  Germany
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Hey
Here you get about F3: 60Hz from the Vifa TC9FD18-08 and no BSC needed.
But the cabinet is flat on the wall (44x65x6.6cm).

Regards
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Old 26th January 2015, 11:34 AM   #4
xrk971 is offline xrk971  United States
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What SPL levels do you need and how much harnonic distortion are you willing to have? I have built about 12 different alignments with the TC9FD (including the above two suggested by Mayuri and Sayrum). It was in fact, the one suggested by Sayrum that introduced me to the TC9FD. If you want "hifi" levels of HD (under 0.5%) you have to cross over above 250Hz to maybe 350Hz. If you can tolerate a few % THD and stay below 80dB for background music you can have it using a DCR - this has the flattest response and reaches 55Hz f3. For best overall musical enjoyment and ability to fill a room with music, the 0.4x Karlsonator is the winner (70Hz f3) You just have to look at how many happy builds there have been on that thread. I have not tried it in the XKi alignment yet but that may prove to be low HD down to 80Hz easily but with some coloration in mid bass.
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Old 26th January 2015, 04:19 PM   #5
pnix is offline pnix  United States
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Thanks guys!

Do we have enough data points that would allow us to do a listing like this?

Code:
Enclosure type / HP type       THD <1%        THD <5%        THD <10%

Closed 24dB@80Hz               85dB           88dB           91dB
...                            ...            ...            ...
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Old 26th January 2015, 05:55 PM   #6
xrk971 is offline xrk971  United States
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I did not measure THD at different SPL levels so may have one set of points. Also, not always at 1m or 2.83v. Also really not the best way to specify it as a single number - I like to see 2nd thru 5th harmonics and in a graph to know where it is bad. Sometimes high THD at very low bass of 50Hz is not bad if fairly clean at 100Hz. Single THD value not super useful unless system is so good you can specify less than 0.5% THD everywhere from 50Hz to 10kHz.
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Old 26th January 2015, 06:56 PM   #7
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Quote:
Originally Posted by pnix View Post
In what type of enclosure would the driver work best if paired with a subwoofer? The goal would be to achieve low frequency extension to about 80Hz. What SPL can be expected?
Just yesterday i dug out my set of 4 of these and went about looking at putting these in a box.

The high Q pushed me to a minimum 5 litre sealed box. Basically you want to put it into as big a box as possible. Sealed or aperiodic.

As box size goes up response won't change much from the sealed 5.5 litre we will put these in for testing. F3 about 105, F6 90, F10 low 70s. Using PE posted numbers (Madisounds make for a worse case)

In a FAST this should really have a higher XO. I'd suggest above 250 Hz.

XRK probably has the most experience with these.

dave
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Old 26th January 2015, 07:03 PM   #8
xrk971 is offline xrk971  United States
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I was able to get away with 1 liter in the Dagger short TL and XO at 400 Hz.
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Old 26th January 2015, 07:06 PM   #9
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by planet10 View Post
Just yesterday i dug out my set of 4 of these and went about looking at putting these in a box.

The high Q pushed me to a minimum 5 litre sealed box. Basically you wanttoput it into as big a box as possible. Sealed or aperiodic.

As box size goes up response won't change much from the sealed 5.5 litre we will put these in for testing. F3 about 105, F6 90, F10 low 70s. Using PE posted numbers (Madisounds make for a worse case)

In a FAST this should really have a higher XO. I'd suggest above 250 Hz.

XRK probably has the most experience with these.

dave
How do you like the sound?
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Old 26th January 2015, 07:41 PM   #10
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We haven't listened to them yet, just finally started towards evaluating them

dave
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