Dual B&C 21DS115-4 Build - Page 2 - AVS Forum | Home Theater Discussions And Reviews
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post #31 of 93 Old 07-04-2019, 07:07 AM - Thread Starter
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Originally Posted by Purenv View Post
Are you replacing or adding to your 2 Faital Pro subs?
I will be replacing them with these, according to my umik one the faital were capable of pretty much 122db across the spectrum, although not sure with how much distortion. These model about +6db across the spectrum each compared to the faitals. So hoping should gain quite a bit of headroom, hence leaning more towards 4ohm. What is the best fan for the inuke to keep it cool and quiet?

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post #32 of 93 Old 07-04-2019, 07:09 AM - Thread Starter
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Realistically how much more power can the inuke give dual 4ohm compared to dual 8ohm?

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post #33 of 93 Old 07-04-2019, 07:19 AM
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Originally Posted by monty6400 View Post
Realistically how much more power can the inuke give dual 4ohm compared to dual 8ohm?
About 1300wpc @ 8 ohm vs about 2000wpc @ 4 ohm, according to this:
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post #34 of 93 Old 07-04-2019, 10:28 AM - Thread Starter
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Thanks guys, really torn between the 4 and the 8 now, maybe I'm overthinking it all! Leaning for towards the 4 but if the inuke can pretty much push the same amount of voltage into both loads, the 8ohm will obviously be easier to drive!
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post #35 of 93 Old 07-04-2019, 11:02 AM
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Originally Posted by smcmillan2 View Post
About 1300wpc @ 8 ohm vs about 2000wpc @ 4 ohm, according to this: https://www.youtube.com/watch?v=73Z2fNcGGDI
depending on sound content... between 300-650 watts. like i said earlier, at that volume only a microphone whould be able to tell the difference. as a side note the amp will run hotter and draw more power from the outlet to get to put out that extra power. I will be running to LaVoce 21s 8ohm for that very purpose to run cooler, less power draw fromoutlet, and equiptment will see less strain.
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post #36 of 93 Old 07-04-2019, 11:08 AM - Thread Starter
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Originally Posted by Purenv View Post
depending on sound content... between 300-650 watts. like i said earlier, at that volume only a microphone whould be able to tell the difference. as a side note the amp will run hotter and draw more power from the outlet to get to put out that extra power. I will be running to LaVoce 21s 8ohm for that very purpose to run cooler, less power draw fromoutlet, and equiptment will see less strain.
Yeah just modeled my box at 1100w vs 1500w and the difference is too little to care, looks like I'll go with the 8 if it means happier equipment! I would buy the lavoces but I am shipping from France, as the lavoces are heavier, but slightly cheaper, the total incl shipping is the same, so figured may aswell go with the B&C!
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post #37 of 93 Old 07-04-2019, 11:24 AM
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DCR is irrelevant for a ported sub as you will add a HPF to lop off the bottom end anyway. Impedance minimum will be around tune in this case and will depend on the enclosure itself. Model it to verify.

IIRC the discussion on this driver on data-bass mentioned that a bridged inuke 3000 is pretty much a perfect fit for the 4 ohm version.

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post #38 of 93 Old 07-04-2019, 11:41 AM - Thread Starter
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DCR is irrelevant for a ported sub as you will add a HPF to lop off the bottom end anyway. Impedance minimum will be around tune in this case and will depend on the enclosure itself. Model it to verify.

IIRC the discussion on this driver on data-bass mentioned that a bridged inuke 3000 is pretty much a perfect fit for the 4 ohm version.
What would you go with, people saying 4ohm is good for 1 channel of the 6000 but running 4ohm dual channels means the amp runs into problems. Modeled 8ohm yellow vs 4ohm grey!
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post #39 of 93 Old 07-04-2019, 01:21 PM
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What would you go with, people saying 4ohm is good for 1 channel of the 6000 but running 4ohm dual channels means the amp runs into problems. Modeled 8ohm yellow vs 4ohm grey!
who says it runs into problems? as far as I recall, you lose about 1dB when comparing a 6000 vs 2 separate 3000s. Are you really going to notice that? seems a bit unlikely to me. Still you have the choice either way. I would think it's also a question of where the amps are, quietly cooling 2 3000s is probably easier than 1 6000.
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post #40 of 93 Old 07-04-2019, 01:26 PM - Thread Starter
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Originally Posted by 3ll3d00d View Post
who says it runs into problems? as far as I recall, you lose about 1dB when comparing a 6000 vs 2 separate 3000s. Are you really going to notice that? seems a bit unlikely to me. Still you have the choice either way. I would think it's also a question of where the amps are, quietly cooling 2 3000s is probably easier than 1 6000.
Earlier someone said during testing both channels at 4ohms it could shut down and that they basically put out give or take 300w ish 4ohm vs 8ohm. The amp is quite close!

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post #41 of 93 Old 07-04-2019, 01:28 PM
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Earlier someone said during testing both channels at 4ohms it could shut down and that they basically put out give or take 300w ish 4ohm vs 8ohm. The amp is quite close!
300w? you mean difference between the two? if so then yes this is in the region of 1dB given inuke power output. Like I say, do you really care about 1dB here or there at 120-125dB?

if you drive any amp hard enough it will shut down or protect itself in some way
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post #42 of 93 Old 07-04-2019, 01:34 PM - Thread Starter
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Originally Posted by 3ll3d00d View Post
300w? you mean difference between the two? if so then yes this is in the region of 1dB given inuke power output. Like I say, do you really care about 1dB here or there at 120-125dB?



if you drive any amp hard enough it will shut down or protect itself in some way
Sorry, I meant the difference between dual 8ohm or dual 4ohm on the inuke, my thinking is if the inuke is only happy pushing a similar (300wish) into 4ohm vs 8ohm, may aswell go with 8 as this should be easier and cooler to run?

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post #43 of 93 Old 07-04-2019, 01:40 PM
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Originally Posted by monty6400 View Post
Sorry, I meant the difference between dual 8ohm or dual 4ohm on the inuke, my thinking is if the inuke is only happy pushing a similar (300wish) into 4ohm vs 8ohm, may aswell go with 8 as this should be easier and cooler to run?

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I don't follow, what is 300wish?
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post #44 of 93 Old 07-04-2019, 01:44 PM - Thread Starter
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I don't follow, what is 300wish?
Someone mentioned the difference between what the inuke can push dual into 4ohm vs 8ohm is around 300w. Ie it can do dual 8ohm at 1100rms all day but goes into protect mode doing more than 1500w dual 4ohm. I think I am majorly overthinking it and the difference probably wont be that great. But a few have no mentioned the inuke 6000 isn't great into dual 4ohms, but most builds on this forum seem to use the inuke 6000 with the 4ohm versions so I'm a bit puzzled!

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post #45 of 93 Old 07-04-2019, 01:49 PM
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Someone mentioned the difference between what the inuke can push dual into 4ohm vs 8ohm is around 300w. Ie it can do dual 8ohm at 1100rms all day but goes into protect mode doing more than 1500w dual 4ohm. I think I am majorly overthinking it and the difference probably wont be that great. But a few have no mentioned the inuke 6000 isn't great into dual 4ohms, but most builds on this forum seem to use the inuke 6000 with the 4ohm versions so I'm a bit puzzled!

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this is what I have been saying

a 300W difference at these power levels is in the region of 1dB so it is true to say that a single inuke 6000 will give up slightly before an inuke 3000

my point is that you're in a home environment, are you really going to notice a 1dB difference when you're listening at 120-125dB peaks?

lets put it this way, this is basically in the region of reference level listening, can you tell the difference between listening at reference and -1?

if yes, buy 2 3000s
if no, be happy with a 6000

if you're putting the 6000 into a location in which you can hear the fans and you have space then you may want 2 3000s anyway to make it easier to cool them (and hence encourage a longer life)
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post #46 of 93 Old 07-04-2019, 01:51 PM
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btw the difference is that 300W sounds like loads, 1dB not so much

marketing eh
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post #47 of 93 Old 07-04-2019, 01:53 PM - Thread Starter
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this is what I have been saying



a 300W difference at these power levels is in the region of 1dB so it is true to say that a single inuke 6000 will give up slightly before an inuke 3000



my point is that you're in a home environment, are you really going to notice a 1dB difference when you're listening at 120-125dB peaks?



lets put it this way, this is basically in the region of reference level listening, can you tell the difference between listening at reference and -1?



if yes, buy 2 3000s

if no, be happy with a 6000



if you're putting the 6000 into a location in which you can hear the fans and you have space then you may want 2 3000s anyway to make it easier to cool them (and hence encourage a longer life)
So back to original question, 4 or 8ohm driver? I'm leaning towards 8 to keep the inuke happy?

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post #48 of 93 Old 07-04-2019, 02:02 PM
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I would go 4

You can always turn it down a bit if you need to
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post #49 of 93 Old 07-04-2019, 02:20 PM - Thread Starter
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If I go 4 I'll get these fans, and set a limiter at 1.5kw. Noctua NF-A8 PWM



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post #50 of 93 Old 07-04-2019, 03:14 PM
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Go 4ohms, they will be easier to sell if you ever need to.
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post #51 of 93 Old 07-04-2019, 04:23 PM - Thread Starter
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Go 4ohms, they will be easier to sell if you ever need to.
Think I will, hopefully wont run into any problems!

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post #52 of 93 Old 07-05-2019, 03:50 AM - Thread Starter
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Going to order the 4ohms on Monday when my old subs arrive with their new owner, and hopefully begin building when I get back from holiday, do all my box calculations check out. Final box is 88x80x60, with 84.4x6x115 cm long port. Around 350l or 12cuft tuned to 18hz after driver and port displacement.

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post #53 of 93 Old 07-05-2019, 03:52 AM - Thread Starter
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1st port resonance is 155hz, velocity max is 20ms-1 at 1500w, 15mm excursion.

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post #54 of 93 Old 07-07-2019, 03:06 PM - Thread Starter
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Final cab design with bracing and lower tune at 17hz. Does this bracing look sufficient?
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post #55 of 93 Old 07-07-2019, 05:45 PM
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The bracing is more than sufficient.
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post #56 of 93 Old 07-07-2019, 05:50 PM - Thread Starter
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The bracing is more than sufficient.
Ever since I underbraced my first cabinet and heard panel resonances I've had worries about bracing ever since. Post traumatic bracing disorder.

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post #57 of 93 Old 07-08-2019, 11:42 AM - Thread Starter
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Done the fan mod today!

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post #58 of 93 Old 07-09-2019, 01:52 AM - Thread Starter
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4ohm drivers ordered, should be here next Wednesday! See you guys then!

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post #59 of 93 Old 07-09-2019, 11:15 PM
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Ever since I underbraced my first cabinet and heard panel resonances I've had worries about bracing ever since. Post traumatic bracing disorder.

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Do tell more about this. What do they sound like? I always thought.. wow here is another engineer... Over engineering.


But I think I might be on the wrong side of this.

I understand resonance disapates energy but how much? Does it sound that much better super still!?

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post #60 of 93 Old 07-13-2019, 03:20 AM - Thread Starter
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Do tell more about this. What do they sound like? I always thought.. wow here is another engineer... Over engineering.


But I think I might be on the wrong side of this.

I understand resonance disapates energy but how much? Does it sound that much better super still!?

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It only used to really happen at certain frequencies, but parts of the back panel used to vibrate and make a loud resonating sound. I've read somewhere that if you sand the box with disc sander, and can get a panel to sing it isn't braced enough!

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