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Old 05-21-2013, 04:04 PM
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LTD02 -

1.76 in total? for all eight drivers getting 300 watts more each?

His drivers are basically co-located. He is running eight drivers of one CV-5000 watt amp - with four on each channel at combined two ohm load giving them each 625 watts (assuming the amp is putting out the full 2500)


When I read carp's question I was roughly thinking he'd get 1.5 out of 1 (using the generic formual of 50% increase of power gives 1.5dB, doubling = 3 db)
an additional 1.5 out of the second one (2 subs)
an additional 1.5 out of the next two (4 subs)
and an additional 1.5 out of the remaining four (total of 8 subs)

so my thought was 1.5 + 1.5 + 1.5 + 1.5 = 6dB more possible headroom for the whole eight drivers getting 300 more watts each --- ASSUMING THEY CAN HANDLE THE POWER -- because they are only rated at 600 watts.


IMO
6dB might be worth it if carp is crazy enough to want more. His house is ready to start imploding now - On the THX Amazing Life Demo I kid you not when I say the projector image looked like it was on some sort of pogo spring shining up to the middle of the ceiling and about 1/3 of the way into the room on the floor. This occurring on an projector that is VERY securely mounted. So securely that it knocked me to the ground when I hit my head on it during one visit. So I don't have any idea why he'd want more. eek.gif The bass is nearly becoming painful. As I was driving home last night I felt like I'd been worked over.

But at any rate - regardless of how enthusiastic you are for bass I think most would agree that if it is truly only a 1.76dB gain for 8 subs getting 50% more power - then I'd pocket the $650 the extra amp costs instead.

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Old 05-21-2013, 04:16 PM
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1.76db for all 8 subs as LTD posted is correct.

You gain 3db per doubling of total power into the entire system.

When you have a single sub that does 120db, you add another with an equal amount of power to both cabinets and so on (assuming they are all perfectly summing in the pass band) you get 120+6 (for 2) + 6 (for 4) and another +6 (for 8), so now you are at 138db.

Say you were putting 1kw into each box. So you are using 8kw for 8 cabinets, to get another 3db you need 16kw or 2kw into each box.
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Old 05-21-2013, 07:36 PM
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"1.76 in total?"

yeah. it is easier to think about it as a total system because if you increase the spl of one sub at a time by 1.76 db, the total system spl only goes up by 1/8th that amount in his case, or about 0.2db, which is pretty much nothing.

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Old 05-21-2013, 07:49 PM
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i forgot if he has the dual 2 ohm drivers or dual 4's.

that could make a difference in whether or not a second amp would add much spl.

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Old 05-21-2013, 08:33 PM
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I think he has dual 4. He runs them at eight ohm individually and all wired together to give a combined load of 2ohm at the amp channel.

IIRC

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Old 05-22-2013, 07:53 AM
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Yep, dual 4's, 4 running off each channel of the CV 5000 amp.
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Old 06-04-2013, 07:47 PM
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im surprised there hasnt been more builds with these lately. still loving mine. wish i had room for more. they are my favorite part of my audio setup

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Old 06-04-2013, 07:58 PM
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Originally Posted by brian6751 View Post

im surprised there hasnt been more builds with these lately. still loving mine. wish i had room for more. they are my favorite part of my audio setup
Probably because the D2's are still out of stock...and we all know the D2's are the best...
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Old 06-04-2013, 09:22 PM
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what. ever.

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Old 06-05-2013, 01:38 AM
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Lol!
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Probably because the D2's are still out of stock...

This is the main reason why we aren't seeing builds. The first lot was sold off almost immediately and the second wave of 18's doesn't come out until.... hey! This month! tongue.gif
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Old 06-05-2013, 04:42 AM
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Can't wait for mine to arrive!!! My CV5000 is getting bored
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Old 06-05-2013, 06:36 AM
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Can't wait for mine to arrive!!! My CV5000 is getting bored

how many are you getting? 4? 8?

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Old 06-05-2013, 06:56 AM
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how many are you getting? 4? 8?

I'm hoping he's getting 4! Otherwise he's been waiting for nothing...lol. <---Unless the D4's are out of stock now?
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Old 06-05-2013, 07:35 AM
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im surprised there hasnt been more builds with these lately. still loving mine. wish i had room for more. they are my favorite part of my audio setup

First few builds kinda covered all the bases. regular dual opposed, sonotube dual opposed, mega huge front firing stylee, perhaps everyone saw what they wanted and are just moving on with their own builds at this point!
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Old 06-05-2013, 09:20 AM
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how about a mega huge ported sono?!

anybody?

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Old 06-05-2013, 12:29 PM
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Ill see how much SOnotube I have left after building two more DO sono's and possibly I will be able to do something cool biggrin.gif just for fun. They almost got dropped into my old LLT's but I chopped em up for the DO boxes I have at the moment...
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Old 06-05-2013, 12:52 PM
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how many are you getting? 4? 8?

Just two at the moment. Can't fit any more than that
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Old 06-05-2013, 01:00 PM
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how about a mega huge ported sono?!

anybody?

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Old 06-05-2013, 01:02 PM
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Ill see how much SOnotube I have left after building two more DO sono's and possibly I will be able to do something cool biggrin.gif just for fun. They almost got dropped into my old LLT's but I chopped em up for the DO boxes I have at the moment...

we may move in the near future and i was kinda thinking of putting my four into some big LLT sonos in the new house if i have the room. im trying to visualize it in every basement we go into biggrin.gif

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Old 06-05-2013, 01:03 PM
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Just two at the moment. Can't fit any more than that

thats cool. you wont have to worry about more amp when you do add more

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Old 06-05-2013, 01:03 PM
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WE SHALL SEE!!!

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Old 06-05-2013, 04:24 PM
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thats cool. you wont have to worry about more amp when you do add more

True storey. But I'm thinking that since I'm pretty happy with the output of my single Rythmik 15 (near field and corner loaded) that two 18s might actually be enough. I just got the CV5000 cos here in NZ it was on special for not much more than an EP4000 and I can't resist more power even if I really don't need it. I like weighty amps - only downside is it's a lot of effort to shift that sucker by yourself.

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Old 06-13-2013, 02:58 PM
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FYI I just got an email that my SI 18 D4s are shipping! Hooray! Well ahead of the 6/28 quote.
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Old 06-13-2013, 03:10 PM
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I should be receiving mine tomorrow already!! biggrin.gifbiggrin.gif
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Old 06-13-2013, 04:25 PM
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Also received tracking. Delivery will take a while tho given how far away I am. Now to come up with box plans, get some veneer ply and figure out how on earth I'm gonna fit these subs into our living room. Wife not happy.
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Old 06-13-2013, 04:37 PM
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My 2 on the way too tongue.gif

I live in the UK, so will be a few days.

It'll give me time to start building something to put them in !!!


biggrin.gif
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Old 06-14-2013, 07:15 AM
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That is great!!!! You guys will love them! I just sent off two dual opposed SI boxes to a fellow AVS'er so I am glad a new crop of builds is coming up for the SI's. Certainly interested in what people come up with!!!
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Old 06-14-2013, 07:31 AM
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That is great!!!! You guys will love them! I just sent off two dual opposed SI boxes to a fellow AVS'er so I am glad a new crop of builds is coming up for the SI's. Certainly interested in what people come up with!!!

Why are you getting rid of yours?
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Old 06-14-2013, 08:18 AM
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Why are you getting rid of yours?

Who said anything about getting rid of mine? These were 4 additional ones that the AVS member had shipped to me to build him some DO boxes out smile.gif I am not getting rid of a single one of mine biggrin.gif That is until those 24's come out biggrin.gif
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Old 06-14-2013, 08:33 AM
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Quote:
Originally Posted by Avgass View Post

True storey. But I'm thinking that since I'm pretty happy with the output of my single Rythmik 15 (near field and corner loaded) that two 18s might actually be enough. I just got the CV5000 cos here in NZ it was on special for not much more than an EP4000 and I can't resist more power even if I really don't need it. I like weighty amps - only downside is it's a lot of effort to shift that sucker by yourself.


lol im laughing so a lot harder at that image then i should be
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