How much power can the SI HT18 D2 handle? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 28 Old 02-04-2020, 05:44 PM - Thread Starter
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I have two of these, each in a Marty Cube enclosure, with each driver wired for 4ohms, and I'm powering both off of one iNuke 3000DSP, would these benefit at all from more power being sent to them? I thought I remembered seeing that they could handle close to 1000 watts RMS...

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post #2 of 28 Old 02-04-2020, 07:42 PM
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post #3 of 28 Old 02-04-2020, 11:36 PM
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Would not push hard into a single 2 ohm channel of an inuke 3000 into low frequencies for long. A 3000 does push 1000 or so watts until shutdown. Too much for an si-18 for long.

Shoot for short bursts at 600 watts max and try to stay below for long duration low hits or edm tunes in either ported or sealed.
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post #4 of 28 Old 02-05-2020, 12:09 AM
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Originally Posted by blake18 View Post
I have two of these, each in a Marty Cube enclosure, with each driver wired for 4ohms, and I'm powering both off of one iNuke 3000DSP, would these benefit at all from more power being sent to them? I thought I remembered seeing that they could handle close to 1000 watts RMS...
Yes. Look into another 3000 and run them both bridged, or get the 6000.


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Would not push hard into a single 2 ohm channel of an inuke 3000 into low frequencies for long. A 3000 does push 1000 or so watts until shutdown. Too much for an si-18 for long.

Shoot for short bursts at 600 watts max and try to stay below for long duration low hits or edm tunes in either ported or sealed.
He is set up for 4 ohms per channel...

I have 2 of the dual 4 ohm versions (wired for 2 ohms), and for the last three years I routinely give them all the nu3000DSP can put out. I set the limiter at -1 dB. Mine hit xMax (modeled) in 10.5 cu. ft. at 950 watts. I believe the 3000DSP puts out about 750-900 watts at 2 ohms.

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post #5 of 28 Old 02-05-2020, 05:02 AM
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Originally Posted by Augerhandle View Post
I have 2 of the dual 4 ohm versions (wired for 2 ohms), and for the last three years I routinely give them all the nu3000DSP can put out. I set the limiter at -1 dB. Mine hit xMax (modeled) in 10.5 cu. ft. at 950 watts.
True, but the op couldn't be more vague about his setup as it relates to his question The enclosure type wasn't given, model information, measurements, etc. Most of us know if a driver, in a given enclosure, reaches xmax at 75% of it's rated rms power, sending the driver more power may very well result in a damaged driver. BTW, although I quoted, the post speaks to the OP

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post #6 of 28 Old 02-05-2020, 11:26 AM
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Originally Posted by johnson636 View Post
True, but the op couldn't be more vague about his setup as it relates to his question The enclosure type wasn't given, model information, measurements, etc. Most of us know if a driver, in a given enclosure, reaches xmax at 75% of it's rated rms power, sending the driver more power may very well result in a damaged driver. BTW, although I quoted, the post speaks to the OP

He wasn't vague about his setup at all.

He stated that he had two SI HT18 D2s in Marty Cubes, powered by an Inuke 3000DSP. That's the driver, the box, the tune, and the amp.

In that scenario, the driver hits 75% of Xmax at 1100 watts, and at 75% of rated power, it reaches about 1/2 of its Xmax. The driver is rated at 600 watts, but the 3000 only puts out around 350-500 watts at 4 ohms, depending on where you get that information.

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post #7 of 28 Old 02-05-2020, 11:42 AM
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Quote:
Originally Posted by Augerhandle View Post
He wasn't vague about his setup at all.

He stated that he had two SI HT18 D2s in Marty Cubes, powered by an Inuke 3000DSP. That's the driver, the box, the tune, and the amp. In that scenario, the driver hits your 75% of xMax at 1100 watts. The 3000 puts out around 350-500 watts at 4 ohms, depending on where you get that information.
Yeah, I initially overlooked those details and I intended to edit my response. That 75% scenario was just an example; pulled that number out of the air. Before I noticed he mentioned Marty Cube, I was trying to convey that depending on the enclosure, you may require less of a driver's rated rms power handling to reach rated xmax. In this case, I was in error, as I overlooked he mentioned what enclosure he was using

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post #8 of 28 Old 02-06-2020, 12:17 AM
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@blake18

Don't forget a High Pass filter at 20 Hz.

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post #9 of 28 Old 02-07-2020, 12:00 AM
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Quote:
Originally Posted by Augerhandle View Post
@blake18

Don't forget a High Pass filter at 20 Hz.
Sorry I missed some details. I have a v1 si18 still working my old man's (70+) year old 10+cuft ported sub. It rocks in his place for 70's and 80's t.v. concerts. Though I don't recommend going over 600w with these for long, under any ohms.... Sadly hurt a coil once. So sad to through away without any recone options that I could find. Was going to use one in a lake boat once, but decided against it after seeing a coil rub and burn in home theater use. Don't know how we smoked it really.

Do to likely heat issues I have had one sealed v1 coil melt under what I thought was lighter load under 600w. I still have 1 ported being used and one practically brand new in box doing nothing for 2 years. si18 v1 4 ohm?

They are / where great low cost 18's! Though even inuke 3000's dsps and newer version can hurt drivers depending on the source material and hot hands. Boom Boom EDM stuff should be ported with low frequency protection or cheaper drivers vs input voltage will smoke.

I love how in the past few years the amps generally sound clean with so much power. Though I do love the cheap clones. I hope the great amp designers can survive, we all so bad?
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post #10 of 28 Old 02-07-2020, 10:26 AM
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Quote:
Originally Posted by cellarnoise View Post
Sorry I missed some details. I have a v1 si18 still working my old man's (70+) year old 10+cuft ported sub. It rocks in his place for 70's and 80's t.v. concerts. Though I don't recommend going over 600w with these for long, under any ohms.... Sadly hurt a coil once. So sad to through away without any recone options that I could find. Was going to use one in a lake boat once, but decided against it after seeing a coil rub and burn in home theater use. Don't know how we smoked it really.

Do to likely heat issues I have had one sealed v1 coil melt under what I thought was lighter load under 600w. I still have 1 ported being used and one practically brand new in box doing nothing for 2 years. si18 v1 4 ohm?

They are / where great low cost 18's! Though even inuke 3000's dsps and newer version can hurt drivers depending on the source material and hot hands. Boom Boom EDM stuff should be ported with low frequency protection or cheaper drivers vs input voltage will smoke.

I love how in the past few years the amps generally sound clean with so much power. Though I do love the cheap clones. I hope the great amp designers can survive, we all so bad?
Yes, if you set it up incorrectly, or clip the signal, you can melt a coil easily.

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post #11 of 28 Old 02-07-2020, 11:49 AM - Thread Starter
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Quote:
Originally Posted by Augerhandle View Post
Quote:
Originally Posted by johnson636 View Post
True, but the op couldn't be more vague about his setup as it relates to his question[IMG class=inlineimg]/forum/images/smilies/rolleyes.gif[/IMG] The enclosure type wasn't given, model information, measurements, etc. Most of us know if a driver, in a given enclosure, reaches xmax at 75% of it's rated rms power, sending the driver more power may very well result in a damaged driver. BTW, although I quoted, the post speaks to the OP[IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG]

He wasn't vague about his setup at all.

He stated that he had two SI HT18 D2s in Marty Cubes, powered by an Inuke 3000DSP. That's the driver, the box, the tune, and the amp.

In that scenario, the driver hits 75% of Xmax at 1100 watts, and at 75% of rated power, it reaches about 1/2 of its Xmax. The driver is rated at 600 watts, but the 3000 only puts out around 350-500 watts at 4 ohms, depending on where you get that information.
The 3000 is tested and proven to provide 680 watts per channel @ 4ohms. 350-500 is way too low of a figure.

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post #12 of 28 Old 02-07-2020, 12:45 PM
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Quote:
Originally Posted by blake18 View Post
The 3000 is tested and proven to provide 680 watts per channel @ 4ohms. 350-500 is way too low of a figure.
Tested and proven by whom? Where? Besides, I said "depending on where you get that information".

Your subs still only reach 75% of Xmax at 1100 watts, and model safe to 2000 watts, which the 3000DSP can't possibly accomplish unless bridged, even using your numbers. When the SI HT18s came out, the nu6000DSPs were regularly recommended for the D2s (4 ohm), and nu3000DSPs for the D4s (2 ohm).

Your question was answered.

Quote:
Originally Posted by blake18 View Post
I have two of these, each in a Marty Cube enclosure, with each driver wired for 4ohms, and I'm powering both off of one iNuke 3000DSP, would these benefit at all from more power being sent to them? I thought I remembered seeing that they could handle close to 1000 watts RMS...

The answer was yes.

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Frequency is a very important consideration when we're talking about the power capabilities of these amps.

While a 3000 can put out ~600W per channel into 4ohms at 30Hz+, it drops off significantly at lower frequencies.

According to https://www.diyaudio.com/forums/clas...surements.html

It could sustain ~480W @ 20Hz for about 10 seconds, after which it dropped to ~280W. It's probably safe to assume that ~280W figure is what we'd see down near 10Hz and in the single digits.

For this reason, I'd be looking to run a bridged 3000 (or a channel of a 6000) if I wanted to sustain something close to 600W in those ULF.

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post #14 of 28 Old 02-07-2020, 02:45 PM - Thread Starter
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Quote:
Originally Posted by Augerhandle View Post
Quote:
Originally Posted by blake18 View Post
The 3000 is tested and proven to provide 680 watts per channel @ 4ohms. 350-500 is way too low of a figure.
Tested and proven by whom? Where? Besides, I said "depending on where you get that information".

Your subs still only reach 75% of Xmax at 1100 watts, and model safe to 2000 watts, which the 3000DSP can't possibly accomplish unless bridged, even using your numbers. When the SI HT18s came out, the nu6000DSPs were regularly recommended for the D2s (4 ohm), and nu3000DSPs for the D4s (2 ohm).

Your question was answered.

Quote:
Originally Posted by blake18 View Post
I have two of these, each in a Marty Cube enclosure, with each driver wired for 4ohms, and I'm powering both off of one iNuke 3000DSP, would these benefit at all from more power being sent to them? I thought I remembered seeing that they could handle close to 1000 watts RMS...

The answer was yes.
Ah, i see, that all makes sense. Would running two drivers off of one bridged channel at 2 ohms (with a 4 pole connector) give me more power than running 4 ohms off of each channel in dual stereo mode?

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Ah, i see, that all makes sense. Would running two drivers off of one bridged channel at 2 ohms (with a 4 pole connector) give me more power than running 4 ohms off of each channel in dual stereo mode?
You can't run 2ohms bridged with that amp. You'd have to run 4ohms bridged into one driver.

I run a 4ohm HT18 on each channel of my 6000. The 6000 is essentially 2 bridged 3000s in one chassis.

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post #16 of 28 Old 02-07-2020, 03:04 PM - Thread Starter
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Oh okay, I forgot about that. You know, when I run two 4 ohm rated subs off of one iNuke 3000DSP, I still get a ton of deep bass below 20hz. It doesn't seem to be lacking, shouldn't it be clipping or running out of steam? I can even run 12hz - 20hz sine waves without issue.

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post #17 of 28 Old 02-07-2020, 03:40 PM
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Oh okay, I forgot about that. You know, when I run two 4 ohm rated subs off of one iNuke 3000DSP, I still get a ton of deep bass below 20hz. It doesn't seem to be lacking, shouldn't it be clipping or running out of steam? I can even run 12hz - 20hz sine waves without issue.
Just curious. If you don't "seem to be lacking" and you "get a ton of deep bass below 20hz" What prompted this thread?

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post #18 of 28 Old 02-07-2020, 03:53 PM - Thread Starter
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Quote:
Originally Posted by johnson636 View Post
Quote:
Originally Posted by blake18 View Post
Oh okay, I forgot about that. You know, when I run two 4 ohm rated subs off of one iNuke 3000DSP, I still get a ton of deep bass below 20hz. It doesn't seem to be lacking, shouldn't it be clipping or running out of steam? I can even run 12hz - 20hz sine waves without issue.
Just curious. If you don't "seem to be lacking" and you "get a ton of deep bass below 20hz" What prompted this thread?
Because I could be thinking I'm getting enough sub 20hz bass, but not realize it's lacking. Just seeing if I don't know what I'm missing, based on other people's experience that have gone from the 3000 to the 6000.

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Oh okay, I forgot about that. You know, when I run two 4 ohm rated subs off of one iNuke 3000DSP, I still get a ton of deep bass below 20hz. It doesn't seem to be lacking, shouldn't it be clipping or running out of steam? I can even run 12hz - 20hz sine waves without issue.
Quote:
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Because I could be thinking I'm getting enough sub 20hz bass, but not realize it's lacking. Just seeing if I don't know what I'm missing, based on other people's experience that have gone from the 3000 to the 6000.
On one hand you say "It doesn't seem to be lacking" but then you say "but not realize it's lacking. Just seeing if I don't know what I'm missing"
Sounds like you need to get a umik and REW up and going so you know exactly what is going on in your room. If your mlp is in a null, then throwing more power at your system won't help at all. Only way to fix a null is adding more subs to address the null.

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post #20 of 28 Old 02-07-2020, 05:40 PM
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Oh okay, I forgot about that. You know, when I run two 4 ohm rated subs off of one iNuke 3000DSP, I still get a ton of deep bass below 20hz. It doesn't seem to be lacking, shouldn't it be clipping or running out of steam? I can even run 12hz - 20hz sine waves without issue.
What's the tune of your subs? What do you have for a HPF?

It sounds like you probably have good room gain. If you have a flat (or rising) response and you aren't hitting the limiter on the amp at the levels you typically listen, then you have enough headroom and adding more amp isn't going to do much for you.

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post #21 of 28 Old 02-07-2020, 09:43 PM
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I don't know if the original si-18 d2 can handle more than the excellent si-18 d4, but I would NOT recommend going over 600 watts for anything. I smoked one on one channel of an inuke 3000dsp into 4 ohm. Roughly 600 watts.

Please read up on the threads about these back in the day. There seemed to be product variance between product runs, and there are obvious product failure trends when the hot handed push the watts and the material is heavy in low frequency.

I am happy with one in a 10 cuft ported box on one channel of a inuke 3000dsp in my dads place, though he does not like too much bass. It has an appropriate HPF though (can't remember, like 17 or 18?).

I ended up throwing one away (Tried mounting it to my garage wall but was to heavy...) Sorry to see the cool basket go.

I still have another in perfect condition in the original box somewhere. I'll try to find it and sell it on here soon. They are great, but the coil can't handle more than 600W for long.... They do vary from production run it seems...

Is there a new SI-18 equivalent for the price?
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post #22 of 28 Old 02-07-2020, 11:46 PM
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Again, if you "smoked" one at 600 watts or under, you did something wrong. If it was defective, you should have gotten it replaced under warranty.

I have one SI HT-15, and one SI HT-18, (both the original D4s set up in parallel for a 2 Ohm load) that I bought in 2014. Each are in 10.5 cubes, tuned to 16.5 Hz and powered by one channel of a nu3000DSP, with a 2nd order HP set at 17 Hz.

The 18" models at full excursion (Xmax) in my setup with 1000 watts. The nu3000DSP puts out 750-1000 watts at 2 ohms (depending on where you get the test data), and I set it to run at full tilt (Limiter set at -0.5 dB) when Master Volume is set at -10 dB. They regularly tickle the limiter lights with movies and music. I have run them this way for 2-1/2 years without any problems.

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post #23 of 28 Old 02-09-2020, 12:45 PM
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The HT18 is rated based on the compliance of its suspension rather than the amount of wattage the coil can handle. Nick rated them at 600 watts, but they can handle more than that if the box itself will keep the excursion in check. A LOT of people here run em at 1kw - 1.1kw and I haven't seen many threads of people who have cooked them.

Just make 100% sure you're keeping that excursion in check and aren't feeding it 50-80hz sine waves at 1kW and you should be fine.
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post #24 of 28 Old 02-09-2020, 12:49 PM
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I've been running mine for over 2 years, each getting a full channel of a 6000DSP into 4ohms. I haven't babied them at all and they also regularly tickle the limiter on the hottest bass hits.

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post #25 of 28 Old 02-09-2020, 05:30 PM
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Been running 8 sealed HT18s (D4s) on 2 inuke6000s (2 HT18s per channel for a 4ohm load) for ~7 years. I didn't know there were issues with the HT18s. Guess I've been lucky.
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post #26 of 28 Old 02-11-2020, 04:09 PM
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Quote:
Originally Posted by klipsch View Post
Been running 8 sealed HT18s (D4s) on 2 inuke6000s (2 HT18s per channel for a 4ohm load) for ~7 years. I didn't know there were issues with the HT18s. Guess I've been lucky.
Just curious, what size are those sealed cabinets?

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post #27 of 28 Old 02-11-2020, 04:21 PM
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Just curious, what size are those sealed cabinets?
I think the 3 DO boxes are around 8.6 cubic feet (~8.3 when accounting bracing and drivers)

The dual front firing box behind the first row of seats is around 8 as well if I remember correctly.

There's a picture of the 3 DO in the Skrams twin build thread. 2 were stained and one was duratex'd
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post #28 of 28 Old 02-14-2020, 01:46 AM
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Been running four HT18d2's in four of those 8cuft flat packs for a while now on a Crown XLS2502, so supposedly ~500-600W a piece no problems so far:

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