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post #151 of 219 Old 04-06-2018, 03:14 PM - Thread Starter
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post #152 of 219 Old 04-07-2018, 10:08 AM - Thread Starter
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The Periscope Subwoofer B&C 21DS115

Edit:. I have removed these fans as of 9-7-2018 and gone back to stock. If the inuke idles for too long without anything playing it overheats and reboots. This likely won't happen if you turn it on and start using it for music and movies because the fans get more voltage that way and thus push more air. If you leave it on for a couple of hours or so playing nothing, it can overheat.


Fans came in yesterday for the iNuke 6000 DSP. I decided to not spend $32 on the noctua and I'm glad I went with these cooler master fans. I used my uncalibrated phone set right in front of the case and measured 38db ambient noise. I turned on the iNuke with stock fans and got 62db! I swapped them with the cooler masters, reconfirmed ambient noise at 38db then turn on the iNuke and got 42-43db! Much better and not audible at all now at the mlp. My projector fan is louder. They are 2000rpm fans, supposed to be long life and push plenty of air forward through the front of the unit. For around $6 bucks each (stock fans on the left, box for new fans on the right in pic), I'm happy with them.

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Last edited by corradizo; 09-08-2018 at 03:00 PM.
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post #153 of 219 Old 04-07-2018, 12:31 PM
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Turned out nice. That setup is a good overall system. The fusion 8 doesn't get enough credit, probably because it's one of the oldest kits, but it certainly sounds good if you can xo at 100+.

Are you using a high pass? With a tune that low, and a nearly indestructible driver, I bet you could run without. especially since the nuker needs some tricks to get the filter that low.
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post #154 of 219 Old 04-07-2018, 02:51 PM - Thread Starter
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Quote:
Originally Posted by Samps View Post
Turned out nice. That setup is a good overall system. The fusion 8 doesn't get enough credit, probably because it's one of the oldest kits, but it certainly sounds good if you can xo at 100+.

Are you using a high pass? With a tune that low, and a nearly indestructible driver, I bet you could run without. especially since the nuker needs some tricks to get the filter that low.
Thanks Samps! I'm really enjoying it.

I am running a HP at 20hz BW12 and have a -6db HS12 @ 20hz per the updated info from @Shreds awesome inuke6k thread. I think this puts the HP at around 14 or 15hz.

Interestingly, i reran audyssey today and audyssey is setting the xover for the L&R at 40hz and the C at 60hz. I think this is because they are tucked in next to the subs and the wall now. I preffer to cross the Fusion8's at 120hz to get the impact from the 21's. No need for an mbm this way. For those reading along, crossing that high does require some work to phase align the C with the subs by playing with the distance setting and using Rew and your mic. Going to 120hz let's the system play clear beyond 0MV.
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post #155 of 219 Old 04-07-2018, 04:38 PM - Thread Starter
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post #156 of 219 Old 04-08-2018, 11:25 AM
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Quote:
Originally Posted by corradizo View Post
Speakon decoder.
Pete,

Just read the entire Periscope thread .
Congrats, Excellent craftmanship! Mike trained you well

I now have a VBSS deficiency complex
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post #157 of 219 Old 04-08-2018, 02:15 PM - Thread Starter
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Originally Posted by cuzed2 View Post
Pete,

Just read the entire Periscope thread .
Congrats, Excellent craftmanship! Mike trained you well

I now have a VBSS deficiency complex


Thanks for the kind words! Mike is the man! I hope my zigging and zagging in the thread didn’t get too annoying. If I had more space I could have gone with a gaggle of vbss subs and also been happy!
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post #158 of 219 Old 04-08-2018, 03:49 PM
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shame to hide those beauties behind the screen.


they look awesome!
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post #159 of 219 Old 04-15-2018, 05:37 AM - Thread Starter
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Speaker stands built from the subs scraps. Finished the same as the subs and stand/rack for cc.

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post #160 of 219 Old 04-15-2018, 05:48 AM
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post #161 of 219 Old 04-15-2018, 08:48 AM - Thread Starter
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The Periscope Subwoofer B&C 21DS115

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Originally Posted by eng-399 View Post
Those speaker stands look really nice Pete! Have you had a chance to turn the 21’s up they should fill the basement with bass.


Thanks! I have cranked them, it is a great deal of power! I definitely heard doors and stuff buzzing and flapping upstairs (for those reading along, my basement is open to the upstairs). It’s different than your room though because the basement doesn’t pressurize. I wish it did but it’s a media area and not dedicated.

The fusion8’s keep up just fine too. I can crank the Denon x2200w beyond reference to the end of the dial with no discomfort. I need to calculate if more power in the avr would further improve things, but I think that’s just me wanting to upgrade all the time :-)

Hope you have fun at Axpona today. I rolled my ankle so I didn’t go on Friday :-/ I’m still hobbling around.
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post #162 of 219 Old 04-16-2018, 02:49 PM - Thread Starter
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The Periscope Subwoofer B&C 21DS115

And speaker stands installed.

They aren’t furniture quality but aren’t crap. ;-)

I ran some sweeps without the insulation before putting it back. With the insulation I was able to cut down the rear reflections. The most drastic change is the center. I’ll try to post some impulse plots to show it change.

Subs would be ruler flat without audyssey from tune to 60hz if not for the standing wave at 18hz. I have a couple of peaks to tame above 60hz on the way to 120hz which is where I’m crossing over.
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post #163 of 219 Old 04-16-2018, 02:58 PM - Thread Starter
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I wanted to try making each subs port face the other to see if that did anything but ran out of time. Would it matter if the port faced each other or faced away like they do now?


Current setup:


Proposed change:
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post #164 of 219 Old 04-16-2018, 08:12 PM
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I would expect very little if any change at all. The wavelengths of the frequencies at which those ports operate are so long (30-80') that placement/direction of the ports doesn't really matter.
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post #165 of 219 Old 04-16-2018, 09:46 PM - Thread Starter
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Quote:
Originally Posted by mtg90 View Post
I would expect very little if any change at all. The wavelengths of the frequencies at which those ports operate are so long (30-80') that placement/direction of the ports doesn't really matter.


Thanks Matt for stopping in! Thanks for the feedback, I'll leave things alone.
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post #166 of 219 Old 04-16-2018, 09:50 PM - Thread Starter
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I was watched Kong: Skull Island tonight at about -10 and it was awesome. I love this bass, it is just what I like about Mikes subs. They are very "crisp" is the best I can figure to say it.
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post #167 of 219 Old 04-17-2018, 08:13 AM
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Quote:
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They are very "crisp" is the best I can figure to say it.
I kinda explained it as "effortless". Like it was just as easy as breathing. I think it goes hand-in-hand with how efficient and low-distortion the subs are. Those Italians sure know how to make nice things, don't they?

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post #168 of 219 Old 04-17-2018, 08:25 AM
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Quote:
Originally Posted by corradizo View Post
And speaker stands installed.

They aren’t furniture quality but aren’t crap. ;-)

I ran some sweeps without the insulation before putting it back. With the insulation I was able to cut down the rear reflections. The most drastic change is the center. I’ll try to post some impulse plots to show it change.

Subs would be ruler flat without audyssey from tune to 60hz if not for the standing wave at 18hz. I have a couple of peaks to tame above 60hz on the way to 120hz which is where I’m crossing over.
For not being 'furniture quality' that sure looks damn fine to me! Outstanding job. I love the massive size contrast between the mains and the subs. I also really dig the 2 tone color of the subs.


Just a quick question, if I may. Do you notice any kind of "cupping" sounds or influences on your center channel with it being in between the subs like it is or is there no affect? Thanks and congrats again on the fantastic setup!
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post #169 of 219 Old 04-17-2018, 12:21 PM
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If the boxes aren't too difficult to move, I'd try aiming the ports in all four locations. Use REW to see which is best. They will be slightly different. My guess is moving the ports to the bottom facing out will be the best.
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post #170 of 219 Old 04-17-2018, 12:28 PM - Thread Starter
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I kinda explained it as "effortless". Like it was just as easy as breathing. I think it goes hand-in-hand with how efficient and low-distortion the subs are. Those Italians sure know how to make nice things, don't they?





Yes! That's a good way to put it. Effortless. It might be the closest I get to owning anything high performance and Italian.
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post #171 of 219 Old 04-17-2018, 12:32 PM - Thread Starter
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For not being 'furniture quality' that sure looks damn fine to me! Outstanding job. I love the massive size contrast between the mains and the subs. I also really dig the 2 tone color of the subs.


Just a quick question, if I may. Do you notice any kind of "cupping" sounds or influences on your center channel with it being in between the subs like it is or is there no affect? Thanks and congrats again on the fantastic setup!


Thank you. Up close they have plenty of flaws. A good from far but far from good situation .

Re the cc. If you scroll back a bit I pack insulation around the cc. I have measured it with and without the insulation so we can compare. I think it sounds better with the insulation and I think the data supports that. Need to find time to post the Rew graphs/mdat.
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post #172 of 219 Old 04-17-2018, 12:34 PM - Thread Starter
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Quote:
Originally Posted by Samps View Post
If the boxes aren't too difficult to move, I'd try aiming the ports in all four locations. Use REW to see which is best. They will be slightly different. My guess is moving the ports to the bottom facing out will be the best.


They aren't tough to move at all, though I did just screw on feet on the bottom. I may try it down the line. I'm not under the gun to get the curtains installed around the screen to stay married.
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post #173 of 219 Old 04-17-2018, 12:38 PM
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Quote:
Originally Posted by corradizo View Post
Thank you. Up close they have plenty of flaws. A good from far but far from good situation .

Re the cc. If you scroll back a bit I pack insulation around the cc. I have measured it with and without the insulation so we can compare. I think it sounds better with the insulation and I think the data supports that. Need to find time to post the Rew graphs/mdat.
Awesome! Looking forward to seeing those graphs.
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post #174 of 219 Old 04-17-2018, 01:27 PM - Thread Starter
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The Periscope Subwoofer B&C 21DS115

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Originally Posted by esappy View Post
Awesome! Looking forward to seeing those graphs.


Here is the mdat with before and after if experts care to analyze ahead of me (I'm no expert)

https://www.dropbox.com/s/ap9ea78fib...ting.mdat?dl=0

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post #175 of 219 Old 04-17-2018, 01:46 PM - Thread Starter
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Impulse responses compared. I think i see improvement.
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post #176 of 219 Old 04-20-2018, 10:34 AM - Thread Starter
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So. Curtain Shaker. Holy $h!T! I just streamed it from my iPhone to the Denon off YouTube to see what would happen.. at -5MV. I was wrong about these being able to pressurize my basement. I felt pressure all around me and in my ears all over the dang basement! I was wrong about them being able to shake the screen. Hellfire, they shook the 24" ceramic tile floor above which shook the projector. Everything shook! Solid alder doors flapped HARD. The ports were moving a good amount of air. It reminded me a bit about how it felt standing 20’ from really powerful drag cars.
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post #177 of 219 Old 05-01-2018, 12:53 PM - Thread Starter
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I had a chance to run some compression sweeps of the subs. I had REW set to -20dbfs and the AVR set to -20MV. Audyssey was off. Only a HP in the iNuke. Mic was about 13.5' away at the MLP. Each run I moved the dial up 5 on the MV with the final sweep at +5MV.
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post #178 of 219 Old 05-01-2018, 03:30 PM
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In REW if you go to controls on the right side you can add offsets to the measurements to normalize them to the +5MV, basically stacking them on top of each other which will help visualize the compression much better.

So for the -20MV sweep add 25dB, then add 20dB to the -15MV sweep, ect...
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post #179 of 219 Old 05-01-2018, 03:56 PM - Thread Starter
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Quote:
Originally Posted by mtg90 View Post
In REW if you go to controls on the right side you can add offsets to the measurements to normalize them to the +5MV, basically stacking them on top of each other which will help visualize the compression much better.



So for the -20MV sweep add 25dB, then add 20dB to the -15MV sweep, ect...


Nice! I will do that. I'll also share my mdat if anyone cares to check it out. https://www.dropbox.com/s/uzf1vbpq3x...eeps.mdat?dl=0
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post #180 of 219 Old 05-01-2018, 05:15 PM
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I don't see any compression there. I don't think you have enough amp to cause much compression. You'll probably see clipping first.
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