Hello all,
So I managed to grab a pair of Vifa TC9FD18 and I had a go at the Vifantastich design (1.2m constant section TL), and I measured the response 1m away in-axis (below) (resting on the floor of a semi-anechoic chamber).
I also attempted to model it in Hornresp. I got very different results from the reference hornresp sim (on the German site linked above), which I suppose comes from different T/S parameters, which puzzles me a bit (I got mine from loudspeakerdatabase). Which are good ? Did anyone else try to model it ?
About the sound, they lack bass. Could that be because of excess stuffing (I filled the part between the driver and closed end with PE fibers) ?
Also, is the 5dB loss from 160Hz to 60Hz normal ?
So I managed to grab a pair of Vifa TC9FD18 and I had a go at the Vifantastich design (1.2m constant section TL), and I measured the response 1m away in-axis (below) (resting on the floor of a semi-anechoic chamber).
I also attempted to model it in Hornresp. I got very different results from the reference hornresp sim (on the German site linked above), which I suppose comes from different T/S parameters, which puzzles me a bit (I got mine from loudspeakerdatabase). Which are good ? Did anyone else try to model it ?
About the sound, they lack bass. Could that be because of excess stuffing (I filled the part between the driver and closed end with PE fibers) ?
Also, is the 5dB loss from 160Hz to 60Hz normal ?
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WIth the Q of the TC9 is not well suited to any box except a big sealed box or something that approaches that. I would not worry about the sim, i would just build a simplier box (about 5 litres sealed does OK.
I know the TC8 get slots of use because it is cheap. But it is a cheap driver (i had to really work to give my 4 away).
dave
I know the TC8 get slots of use because it is cheap. But it is a cheap driver (i had to really work to give my 4 away).
dave
I had to add a constricted vent to turn it into a MLTL. The bass was much improved. Use only light stuffing from closed end to 180 deg turn. It’s a wall mount so should not need baffle step compensation.
Flat Wall Mount Stereo MLTL using TC9FD's (2)
But in general, you are not going to get much bass just given how small the driver is.
Flat Wall Mount Stereo MLTL using TC9FD's (2)
But in general, you are not going to get much bass just given how small the driver is.
Yep, with its high Qts, the TC9 is not the best candidate for a TL.
Even though I knew it, i did try it, just to confirm. 🙂
The TC9 will be much better with a woofer helper taking care of the bottom end.
If you want to stay in TL territory, look for drivers with a Qts around 0.5. They usually work better.
Even though I knew it, i did try it, just to confirm. 🙂
The TC9 will be much better with a woofer helper taking care of the bottom end.
If you want to stay in TL territory, look for drivers with a Qts around 0.5. They usually work better.
The design needs to be modelled as an offset driver system (OD not Nd). Add absorbent filling material using the Loudspeaker Wizard.
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Not true. Drivers with Qts higher than 0,7 can benefit alot from TL beacuse system resonance can be tuned below Fs giving extended low response. Also, with proper stuffing you can keep system Q low enough to avoid boomy bass compared to same driver in closed or vented box.
But, with such small driver you cant expect alot of bass, even in a TL.
We're talking about 55Hz knee for a regular 3" full range driver, so, no bass demons for sure, but believable bass.
I've been using sim simulations and hands on experience for a while now, and from what I have seen and measured, most well-behaved TLs have a driver around 0.5 Qts. Yes, as with any good rule, there are exceptions.
Most Qts 0.75 and above will have a sharp bass spike at tuning that is almost impossible to tame.
And I tried the TC9 in a MLTL. It behaves well enough, but does not gain the bass reach that other similar 3.5" drivers can achieve.
When in doubt, sim it! 🙂
I've been using sim simulations and hands on experience for a while now, and from what I have seen and measured, most well-behaved TLs have a driver around 0.5 Qts. Yes, as with any good rule, there are exceptions.
Most Qts 0.75 and above will have a sharp bass spike at tuning that is almost impossible to tame.
And I tried the TC9 in a MLTL. It behaves well enough, but does not gain the bass reach that other similar 3.5" drivers can achieve.
When in doubt, sim it! 🙂