Search found 13 matches

by Drake
Mon May 24, 2021 12:01 am
Forum: Home Theatre/Stereo/Auto Sound
Topic: Auto Tuba Size and Drivers
Replies: 13
Views: 2119

Re: Auto Tuba Size and Drivers

Wow that's some amp! Thing about vintage gear is they do make great heaters. However, they seem to last forever! Sounds like my little 200 watt RMS amp will not overdrive dual MCMs. And $35 each is down right affordable! If by chance they do get overdriven, I can always upgrade to the Tang Band W8-7...
by Drake
Sun May 23, 2021 1:36 pm
Forum: Home Theatre/Stereo/Auto Sound
Topic: Auto Tuba Size and Drivers
Replies: 13
Views: 2119

Re: Auto Tuba Size and Drivers

If the above reasoning is correct, then I can choose the various parameters to produce an auto tuba with the desired characteristics. For example, if it's desired to have an auto tuba that is low and loud, then choose a driver with a Qts of 0.5, a Vas of 45, a really large Xmax, a low fs, and build ...
by Drake
Sun May 23, 2021 1:24 pm
Forum: Home Theatre/Stereo/Auto Sound
Topic: Auto Tuba Size and Drivers
Replies: 13
Views: 2119

Re: Auto Tuba Size and Drivers

And finally, the Vas of the driver. The listed Vas range for the driver is 15 to 45 liters. I would expect narrow auto tubas would benefit from a lower Vas, while wider tubas would benefit from a larger Vas. It would also go to reason that using 2 drivers would double the Vas, and therefore need a w...
by Drake
Sun May 23, 2021 1:19 pm
Forum: Home Theatre/Stereo/Auto Sound
Topic: Auto Tuba Size and Drivers
Replies: 13
Views: 2119

Re: Auto Tuba Size and Drivers

Following similar reasoning, the lower f3 frequency of the system should be a function of the fc frequency of the cabinet and the fs frequency of the speaker. Obviously the fc of the horn is a function of the geometry, the horn opening diameter, and is fixed for the auto tuba. The listed frequency r...
by Drake
Sun May 23, 2021 1:07 pm
Forum: Home Theatre/Stereo/Auto Sound
Topic: Auto Tuba Size and Drivers
Replies: 13
Views: 2119

Re: Auto Tuba Size and Drivers

Getting back to driver selection, perhaps the question should be restated a bit to provide guidance about selecting the proper driver. In an oscillating system, Q is a measure of the energy stored vs the energy dissipated. A higher Q system will be able to play at a higher volume, over a narrower fr...
by Drake
Sun May 23, 2021 11:26 am
Forum: Home Theatre/Stereo/Auto Sound
Topic: Auto Tuba Size and Drivers
Replies: 13
Views: 2119

Re: Auto Tuba Size and Drivers

The amp is a California A400XL MOSFET Bridgeable 2 Channel amp with 400 watt peak power. It has a low pass filter but no high pass filter for filtering subsonic noise. I bought it in 1996 and it has served me well for the past 25 years. I have always used it with sealed enclosures. My original subwo...
by Drake
Fri May 21, 2021 8:39 pm
Forum: Home Theatre/Stereo/Auto Sound
Topic: Auto Tuba Size and Drivers
Replies: 13
Views: 2119

Auto Tuba Size and Drivers

I am wanting to upgrade my sub. My current sub is a single 12" in a sealed box, tuned to a Qtc of around 0.8 with an f3 of 37 Hz. Nice little sub, but it tends to cause my amp to overheat. My amp is a vintage amp from the 90s that has about 200 watts rms / 400 watts peak. So I'm looking at buil...
by Drake
Sun Oct 11, 2020 8:51 pm
Forum: Tips, Techniques and Supplier Links
Topic: Sound Proofing my Home Theater Room
Replies: 5
Views: 1118

Re: Sound Proofing my Home Theater Room

Well I like the Lear Jet analogy. Unfortunately, due to duct work in the ceiling, I can't put the new ceiling joists between the old ones. The new joists are below the old ones and are 2x6s to handle the weight. Put in a layer of 3/4 plywood, 3/4 inch rubber, and 5/8 inch drywall. R22 insulation in ...
by Drake
Fri Oct 02, 2020 8:23 pm
Forum: Tips, Techniques and Supplier Links
Topic: Sound Proofing my Home Theater Room
Replies: 5
Views: 1118

Sound Proofing my Home Theater Room

So, I built the 36 inch wide THT sub, and a couple of TLAH speakers. The system blew my mind! So awesome! Then I moved to a house with no insulation in the interior walls, and hard wood floors. I set my system up in the basement. And now I shake the whole house when I watch a movie or listen to musi...
by Drake
Fri Dec 22, 2017 10:29 pm
Forum: Introduce Yourself
Topic: Hello From Touchet WA
Replies: 7
Views: 1614

Re: Hello From Touchet WA

As for your driver, place a vacuum nozzle (turned off) over the dent. Then quickly turn it on and off a few times to pop it out. You could send it back but the damage on a sub is mostly cosmetic. I tried that this evening with a shop vac and unfortunately it didn't pop out. I also tried denting in ...
by Drake
Fri Dec 22, 2017 12:25 am
Forum: Introduce Yourself
Topic: Hello From Touchet WA
Replies: 7
Views: 1614

Re: Hello From Touchet WA

So the Tang Band 8 inch driver arrived today. Eagerly opened it up to see what it looks like. Here it is. https://photos.app.goo.gl/Q0EU4EbwXVREpfRO2 Notice the dent in the cover on the cone... is that a cause for concern? Any way to get it to pop back out? Should I send it back and get a new one? O...
by Drake
Thu Dec 21, 2017 11:17 pm
Forum: Introduce Yourself
Topic: Hello From Touchet WA
Replies: 7
Views: 1614

Re: Hello From Touchet WA

Nice. The myth of wave propagation. Well now I at least have a name for it. I never realized that punchy sound was from high level distortion of the speaker cone. But it does make sense! I was thinking along the lines of how quickly the system has to react to an impulse and if the transient response...
by Drake
Thu Dec 21, 2017 7:43 pm
Forum: Introduce Yourself
Topic: Hello From Touchet WA
Replies: 7
Views: 1614

Hello From Touchet WA

I'm new to the speaker building world. I have purchased a few books on speaker design and building, and learned a bit about designing and building sealed boxes, ported boxes, boxes with passive radiators, transmission line speakers. Surprisingly the books did not discuss horns. Well, I have a woofer...