Vifa TC18WG69 enclosure help

[Mayuri]

Hello everyone!

I am completely stuck with designing enclosures for this driver. I've tried to consult WinISD, but I only get either a HUGE enclosure (83 litres tuned at 30 Hz), or a nice sized enclosure with a huge spike around 100 Hz and an organ pipe for the reflex channel.

Here's the driver specs: Riviera Acoustics - TC18WG69-08 Midwoofer

I was hoping to build a nice bookself speaker with these drivers since I got them real cheap second-hand, but the project isn't going anywhere now. I know the enclosure shouldn't be larger than the Vas of the element, so the 83 litres seems ridiculous. Should I just sell the drivers, since they've been only collecting dust, or can I actually get something useful out of them?

Best regards,
Simo

[Inductor]

If you have the time I would consider/suggest using the simulator from Wayne Parham instead of WinISD at the PiSpeakers Website. Go to: Pialign Analysis Software to help you design your enclosures. This is the old DOS original from 1977.
Pi Speakers - unmatched quality and state-of-the-art performance

[Ron E]

Originally Posted by Mayuri

I was hoping to build a nice bookself speaker with these drivers ... can I actually get something useful out of them?

I have mine TC18-49 - same driver specs, different frame, in a 24L sealed box, actually I wish I had gone a bit smaller. Probably not smaller than 12 liters. Not that critical...

anything with Qts>0.4 will require Vb>Vas in a vented box.

[Mayuri]

Originally Posted by Inductor

If you have the time I would consider/suggest using the simulator from Wayne Parham instead of WinISD at the PiSpeakers Website. Go to: Pialign Analysis Software to help you design your enclosures. This is the old DOS original from 1977.
Pi Speakers - unmatched quality and state-of-the-art performance

I might check it out one day, but right now I don't have the time to learn to use a new simulating program

Originally Posted by Ron E

I have mine TC18-49 - same driver specs, different frame, in a 24L sealed box, actually I wish I had gone a bit smaller. Probably not smaller than 12 liters. Not that critical...

anything with Qts>0.4 will require Vb>Vas in a vented box.

Didn't know that, thanks! WinISD gives me 37 litres for the sealed box with Qtc of 0,707, which is a tad bit large. If I reduce it down to 12, the Qtc is almost 1. But I guess we have to make compromises

[Ron E]

Originally Posted by Mayuri

Didn't know that, thanks! WinISD gives me 37 litres for the sealed box with Qtc of 0,707, which is a tad bit large. If I reduce it down to 12, the Qtc is almost 1. But I guess we have to make compromises

There is nothing magic aboput a Qtc of 0.707 - 1 even sounds better on much material. My boxes sound too lean, honestly, and I like lean bass...

[Mayuri]

Alright, I see it now. Thanks kindly for the help!

[Mayuri]

What Tangband/Monacor tweeter would you guys recommend to go with this driver?
I was thinking of this Tangband driver, would it work?

[Inductor]

The problem is not with the tweeter. That tweeter looks marvelous (on paper). The problem is with the xover frequency, and/if the midwoofer can resist at around 1K to be merged at xover band. (This is) If you 'r pointing for a textbook 2K5/3K xover and you can design the xover, look at frequency output at/around 1KHz. How are you about solving the peaks and dips?

[Mayuri]

I was actually going to do an active speaker with a Tripath Ta2020 or 2024 stereo amp. One channel would be feeding the tweeter, other the bass. So I could (and will) use a line-level Xover.

[Mayuri]

Hello again!

I've made no progress at all with these drivers, until my cousin informed me she needs a pair of speakers. I have 4 of these drivers, and intend to do a floorstanding pair with 2 of these in each. The speakers would have about 30l internal volume, sealed enclosure. They would be placed next to a concrete wall. I'm planning of doing the xover low, 6db/oct at 1kHz and maybe putting a full range or a tweeter that can go low on the upper end.

Would this work?