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by Bill Fitzmaurice
Mon Mar 18, 2024 10:41 pm
Forum: Jack
Topic: Jack 110 questions
Replies: 22
Views: 2029

Re: Jack 110 questions

You can't use off the shelf crossovers with piezos.
by Bill Fitzmaurice
Mon Mar 18, 2024 6:29 am
Forum: Build Threads
Topic: Simplexx 1x12 Build - Woofer only
Replies: 21
Views: 927

Re: Simplexx 1x12 Build - Woofer only

'Prince'.
by Bill Fitzmaurice
Sun Mar 17, 2024 3:18 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

The LaVoce has 95% of the LAB capability at 60% of the price. If you can only have one then LAB makes sense, but with a herd not so much. Pay attention to having the holes in panel 5.
by Bill Fitzmaurice
Sat Mar 16, 2024 1:24 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

I'd do it in 2x12, 30 inches wide, loaded with LaVoce SSF122.50L. Even eight of them should get you kicked out of Burning Man.
by Bill Fitzmaurice
Fri Mar 15, 2024 9:02 pm
Forum: Reviews
Topic: Impressions of the THT.
Replies: 13
Views: 656

Re: Impressions of the THT.

:clap:
by Bill Fitzmaurice
Thu Mar 14, 2024 11:16 am
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

24". Wider would fill in that low end trough.
by Bill Fitzmaurice
Thu Mar 14, 2024 7:38 am
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

Yeah, I need to replace that chart, as it's not accurate. It goes back 20 years, when HornResp wasn't as sophisticated as it is now. This is 8 T48: https://billfitzmaurice.info/images/SPL/T48/8%20cabs.jpg Again, to understand it model it. Model one cab for the base SPL, use the multiple cabs in para...
by Bill Fitzmaurice
Wed Mar 13, 2024 11:32 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

If I understood Bill correctly, and Bill please correct me if I'm off base, the first 8 max width cabs of either design will scale at 6dB per doubling cab count (3dB for increased efficiency, 3dB for doubling power) and additional cabs beyond that are just 3dB per doubling of cab count for doubling...
by Bill Fitzmaurice
Wed Mar 13, 2024 9:14 am
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

OK, I found the B2 design specs. It is a bandpass, it's not a horn. There's a horn like exit on the front chamber in that it's tapered, but with a length of some 40cm it would only horn load to 800Hz. Like all bandpass they have fairly high sensitivity, better than reflex but not as good as a horn, ...
by Bill Fitzmaurice
Tue Mar 12, 2024 10:26 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

I don't know what the exact B2 design is, but all horns are bandpass. Their figures are fake, though, as they use peak. Engineers don't use peak. Marketing departments do. I can say for sure that they can't get the most from two 18s from a cabinet of that size. It's even too small to even get the mo...
by Bill Fitzmaurice
Tue Mar 12, 2024 9:51 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: T60 15” Driver Version - 27” Wide or More?
Replies: 1
Views: 73

Re: T60 15” Driver Version - 27” Wide or More?

If you go too wide the throat is too large for optimal loading.
by Bill Fitzmaurice
Tue Mar 12, 2024 7:30 am
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

It's more like terminal velocity of a falling object, which is caused by wind resistance. Another way to visualize it is a given speaker or group of speakers is limited to a maximum electrical power to acoustical power efficiency. Say it's 50%. You can get that with one perfect horn. The reason we d...
by Bill Fitzmaurice
Mon Mar 11, 2024 9:21 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

View it with HornResp. Model a sub, then use the multiple speakers tool to see what happens as you add more drivers. Keep the impedance constant by adding the same number of parallel and series. Sensitivity will go up, but by more in the low end, eventually reaching a point where it's flat all the w...
by Bill Fitzmaurice
Mon Mar 11, 2024 3:09 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

The efficiency limit is when you've got all you can get. If you could keep getting 6dB additional sensitivity with each doubling of cab count eventually you'd not only reach 100% power conversion efficiency, you'd exceed it. The finite efficiency limit with low frequency horns is around 50%, with di...
by Bill Fitzmaurice
Mon Mar 11, 2024 1:34 pm
Forum: Tuba and Titan Pro-Sound Subwoofers
Topic: Are 24 x T60-LAB15s Enough? ;)
Replies: 36
Views: 866

Re: Are 24 x T60-LAB15s Enough? ;)

T60 and T48 in those numbers have the same sensitivity, as both have reached the efficiency limit, while T60 still goes lower. That being the case neither benefit from any effort at additional boundary loading, unless there's a twenty foot high wall you can use.