AVS Forum banner

1 - 20 of 80 Posts

·
Registered
Joined
·
256 Posts
Discussion Starter · #1 ·
Per the title...



I have four Stereo Integrity HT 18 D4 for IB install via two manifolds. How much RMS power can each driver "safely" handle (using both voice coils)? Estimates are okay!



OR... What is an acceptable rule-of-thumb regarding "rated specs" (which are probably assuming enclosed) vs. IB? 25 percent, 50 percent, 75 percent? Estimates okay!
 

·
Registered
Joined
·
749 Posts
As per above, keep within rated specs and you should be safe.


WinISD can model excursion for an effectively IB design (just model as a massive sealed box) to give you more confidence.
 

·
Registered
Joined
·
256 Posts
Discussion Starter · #4 ·
The listening space is 16x24x9. So I can safely power each subwoofer with 600w RMS? I don't have WinISD and honestly am losing my ability to function so I'd rather not try. I'm just trying to enjoy my time for now.
 

·
Registered
Joined
·
65 Posts

Running in IB you may not even need all 600 watts to drive them to xmax. You could always test them free-air so that you can dial in the gain to set your max threshold.
 

·
Registered
Joined
·
879 Posts
Modeling in Winisd in an infinite baffle, 600 watts total (150 watts per driver) puts them at xmax at 10Hz, never exceeding the xmech. 200 watts per driver is the limit to stay safely within the mechanical limits of the driver without a high pass filter. 600 watts per driver is overkill, pushing them to xmax at 23 Hz and beyond Xmech at about 12 Hz.
 

·
Registered
Joined
·
1,421 Posts

Quote:
Originally Posted by gworrel  /t/1521936/stereo-integrity-ht-18-d4-infinite-baffle-how-much-safe-power-per-driver#post_24467580


200 watts per driver is the limit to stay safely within the mechanical limits of the driver without a high pass filter..
Were it only that simple....


The OP is attempting to create a situation where regardless of how the system is driven the drivers can't be damaged.


That's problematic; if he stays to the 200 watts/driver and a signal comes to the amp that causes it to go into hard clipping, (due to insufficient power) that has the potential to do as much damage as does exceeding Xmech with a higher powered amp.


The 'best' solution in this instance is probably to use an amp with a bit more power combined with a high-pass filter. That way there's adequte power for large transients, but the drivers have protection via the high-pass filter.
 

·
Registered
Joined
·
879 Posts

Quote:
Originally Posted by Thomas-W  /t/1521936/stereo-integrity-ht-18-d4-infinite-baffle-how-much-safe-power-per-driver#post_24467787


That's problematic; if he stays to the 200 watts/driver and a signal comes to the amp that causes it to go into hard clipping, (due to insufficient power) that has the potential to do as much damage as does exceeding Xmech with a higher powered amp.

Wouldn't it also be possible to set the gain structure so the amp will not go into clipping at maximum volume? Or use an Inuke amp with dsp and set the maximum output there? You're right though, it is not as simple as I stated.
 

·
Registered
Joined
·
1,421 Posts

Quote:
Originally Posted by gworrel  /t/1521936/stereo-integrity-ht-18-d4-infinite-baffle-how-much-safe-power-per-driver#post_24467958


Wouldn't it also be possible to set the gain structure so the amp will not go into clipping at maximum volume?

One would need a system that 'clamped' the input voltage to a set max. Easy to talk about probably not as easy to implement
Quote:
Or use an Inuke amp with dsp and set the maximum output there?

Sorry, I'm not familiar with the DSP capabilities of those amps
 

·
Registered
Joined
·
256 Posts
Discussion Starter · #11 ·
Okay, so 200-300 watts amp power per driver is more than enough and I need to implement some way of avoiding more than 150-200 watts to each. This avoids both amp clipping and reaching driver Xmech. Good to know. Anyone know how to limit amp output... maybe some sort of compressor/limiter? Or maybe low power breakers of fuses at the amp outputs?
 

·
Registered
Joined
·
256 Posts
Discussion Starter · #13 ·

Quote:
Originally Posted by moosifee  /t/1521936/stereo-integrity-ht-18-d4-infinite-baffle-how-much-safe-power-per-driver#post_24468969


The iNuke DSP models have voltage limiting as a DSP feature.

I'd like to try and avoid class D amps. Will a DCX2496 or DEQ2496 perform the same function?
 

·
Registered
Joined
·
256 Posts
Discussion Starter · #15 ·

Quote:
Originally Posted by moosifee  /t/1521936/stereo-integrity-ht-18-d4-infinite-baffle-how-much-safe-power-per-driver#post_24469184


Why?


No.

I'm not convinced that class D has reached true hi-fi capability. For instance, the Behringer iNuke amps I've looked at have damping factors of about 140. Yes, I know folks will argue this isn't important but in my experience high current amps with high damping factors seem to produce more articulate bass... the older big Adcoms to mind.
 

·
Registered
Joined
·
8,854 Posts

Quote:
Originally Posted by TinnEars  /t/1521936/stereo-integrity-ht-18-d...much-safe-power-per-driver/0_50#post_24469243


I'm not convinced that class D has reached true hi-fi capability.
For sub amps? Good grief. Driver non linearity will vastly outweigh any distortion that the amp produces, irrespective of class.


As for class D not being high fidelity, you need to look at Hypex for wide band units.
 

·
Registered
Joined
·
256 Posts
Discussion Starter · #17 ·

Quote:
Originally Posted by A9X-308  /t/1521936/stereo-integrity-ht-18-d4-infinite-baffle-how-much-safe-power-per-driver#post_24469317


For sub amps? Good grief. Driver non linearity will vastly outweigh any distortion that the amp produces, irrespective of class.


As for class D not being high fidelity, you need to look at Hypex for wide band units.

No, it's not distortion characteristics nor even poorly filtered high frequency switching (not that either are issues with iNuke amps). It's the low damping factor. I realize some class D amps are advertised as having 400+ damping but I've read that this can be misleading in class D amps. I wish I had a way to audition some without wasting a retailer's time but I don't. Is there no other way to set up a limiter other than going with iNuke amps?
 

·
Registered
Joined
·
8,854 Posts

Quote:
Originally Posted by TinnEars  /t/1521936/stereo-integrity-ht-18-d...much-safe-power-per-driver/0_50#post_24469340


It's the low damping factor.
Which is irrelevant. What is the DF at the end of 10m of cable, i.e. actually at the drivers where it's relevant? Run the numbers using DF of 140 and 400 and whatever gauge of cable you use and get back to me.
 

·
Registered
Joined
·
256 Posts
Discussion Starter · #19 ·

Quote:
Originally Posted by A9X-308  /t/1521936/stereo-integrity-ht-18-d4-infinite-baffle-how-much-safe-power-per-driver#post_24469370


Which is irrelevant. What is the DF at the end of 10m of cable, i.e. actually at the drivers where it's relevant? Run the numbers using DF of 140 and 400 and whatever gauge of cable you use and get back to me.

I don't know how to do that and can no longer learn new things. All I know is what my ears tell me. Like I stated, I wish I could audition some class D amps but I can't. I'm very open minded provided I can be shown (can hear) the facts. Maybe my best bet is to buy an amp, test it, and sell it if I don't like it. But finding amps I like could take months and lots of lost revenue.
 

·
Bass Enabler
Joined
·
21,719 Posts
Or you could take our word for it since you are here asking us. Just a thought.
Obviously you are free to make your own decisions.


There is no reason to believe that the iNuke amps or similar would not provide excellent SQ, especially for this application. Something like the iNuke3000 would be great for this. Just pick the one with DSP built in or not.


I think you're good.
 
1 - 20 of 80 Posts
Top