THT, What to expect from Premium driver?

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El dillo
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THT, What to expect from Premium driver?

#1 Post by El dillo » Sat Sep 12, 2020 1:55 pm

What to expect from Premium driver UM15-22 vs RSS390HF-4 15".
I´m planning to build a second THTLP and i got some decision anxiety about what driver to go with.
  • Sensitivity ?
  • How much wattage/volt is it safe to power it with ?
  • What does it make it a premium driver (more SPL?)
I do know it got more volume displacement but also lower sensitivity so it should need more power to get the same output and theoretically it would get louder also because of higher VD.

Any other differences you might know...

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Bill Fitzmaurice
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Re: THT, What to expect from Premium driver?

#2 Post by Bill Fitzmaurice » Sat Sep 12, 2020 2:28 pm

There's not enough difference between the two to make a recommendation other than to buy whichever is on sale for the lower price. Loaded in the THT you should never approach the limits of either before causing damage to your home. Whatever you've learned or been told about how drivers work in direct radiators for the most part doesn't apply to horns.

El dillo
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Re: THT, What to expect from Premium driver?

#3 Post by El dillo » Sat Sep 12, 2020 3:07 pm

Ok, i just thought that the longer xmax was prefered in this case

Thanks for your quick reply.

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Bill Fitzmaurice
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Re: THT, What to expect from Premium driver?

#4 Post by Bill Fitzmaurice » Sat Sep 12, 2020 4:00 pm

The longer xmax would only allow you to knock more stuff off the walls and piss of more neighbors. along with the local constabulary. The only thing more destructive than two THT has the name 'Caterpillar'.

Bruce Weldy
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Re: THT, What to expect from Premium driver?

#5 Post by Bruce Weldy » Sat Sep 12, 2020 5:25 pm

Bill Fitzmaurice wrote:
Sat Sep 12, 2020 4:00 pm
The only thing more destructive than two THT has the name 'Caterpillar'.
Good line....

I'll be interested to hear if that reference translates in Sweden....... :mrgreen:

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El dillo
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Re: THT, What to expect from Premium driver?

#6 Post by El dillo » Sat Sep 12, 2020 6:07 pm

I am actually after the possibilty to flatten the frequency response a little bit better. EQ does not help over the different seating positions.

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Bill Fitzmaurice
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Re: THT, What to expect from Premium driver?

#7 Post by Bill Fitzmaurice » Sat Sep 12, 2020 9:25 pm

EQ can't fix room boundary effects, because as you've found a boost or cut that flattens response at one listening position makes it worse in another. Only with multiple subs can you fix room modes. When you double the sub count you get an immediate across the board 6dB sensitivity increase, which for equal volume halves the excursion per driver.

El dillo
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Re: THT, What to expect from Premium driver?

#8 Post by El dillo » Sun Sep 13, 2020 3:51 am

I know, I'm interested in the technical differences about those 2 drivers when installed in the THT.

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daveode
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Re: THT, What to expect from Premium driver?

#9 Post by daveode » Sun Sep 27, 2020 1:23 pm

2 THTLP’s here... you can get them flat, and you can get them LOUD with 2. mine are 31” wide. Located at the front and rear of the room mouths about 20” away from the corner. My bass is even enough for my room. I’m using the RSS Dayton subs.
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