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Old 05-29-2011   #226
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Ok, just finished reading this entire thread and there isn't as much detailed info about using these for midbass drivers as I hoped for.

I want some 843Ds in a pair of kicks for my GMC Sierra crew, hopefully I'll be able to get em big enough to net the recommended .25 cubes for sealed enclosures. I plan on running them of an MB Quart ONYX 4.125, wirin them at 2 ohms so they'll get 250 watts rms/each. I have a set of Phoenix Gold Ti comps in the doors now and I'd like to run them only down to the 250-400 hz range.
Questions:
How much do these speakers displace? Would running them as midbass change the enclosure requirements? I plan on running them down to either 63 or 80 hz, what would you recommend I run them up to while still maintaining clean out put down near the 60-80 hz range.

PS, I like things loud, real loud on occasion, but SQ is top priority.
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Old 05-29-2011   #227
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

Quote:
Originally Posted by Fricasseekid View Post
Ok, just finished reading this entire thread and there isn't as much detailed info about using these for midbass drivers as I hoped for.

I want some 843Ds in a pair of kicks for my GMC Sierra crew, hopefully I'll be able to get em big enough to net the recommended .25 cubes for sealed enclosures. I plan on running them of an MB Quart ONYX 4.125, wirin them at 2 ohms so they'll get 250 watts rms/each. I have a set of Phoenix Gold Ti comps in the doors now and I'd like to run them only down to the 250-400 hz range.
Questions:
How much do these speakers displace? Would running them as midbass change the enclosure requirements? I plan on running them down to either 63 or 80 hz, what would you recommend I run them up to while still maintaining clean out put down near the 60-80 hz range.

PS, I like things loud, real loud on occasion, but SQ is top priority.
Same here. With my fullrange capable of going down to 250hz, I should be good with a pair of these. Now I gotta get more money up for a Hertz amp to push these.

Melodic Acoustic Intimid8r and Faital Pro 3FE22,dayton amtpod-4, 1 SS TN1.1200D, will be looking for 1 SS Synthesis dsp, JBL W12GTIMKII
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Old 05-29-2011   #228
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Quote:
Originally Posted by Fricasseekid View Post
Ok, just finished reading this entire thread and there isn't as much detailed info about using these for midbass drivers as I hoped for.

I want some 843Ds in a pair of kicks for my GMC Sierra crew, hopefully I'll be able to get em big enough to net the recommended .25 cubes for sealed enclosures. I plan on running them of an MB Quart ONYX 4.125, wirin them at 2 ohms so they'll get 250 watts rms/each. I have a set of Phoenix Gold Ti comps in the doors now and I'd like to run them only down to the 250-400 hz range.
Questions:
How much do these speakers displace? Would running them as midbass change the enclosure requirements? I plan on running them down to either 63 or 80 hz, what would you recommend I run them up to while still maintaining clean out put down near the 60-80 hz range.

PS, I like things loud, real loud on occasion, but SQ is top priority.
Jim Walters I still around answering questions on this thread right?
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Old 05-29-2011   #229
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

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Originally Posted by Fricasseekid View Post
Jim Walters I still around answering questions on this thread right?
Yes, however I do know that his job/schedule takes him all over the world so he doesnt always have the time to chime, add to that the holiday weekend?

I thought the magazine article that spoke of the camaro discussed the use of the 8s as midbass drivers? I thought it said 300hz but I may have it confused with something else..... I also thought it said that they went down to 60 or 50 with a 15" taking over from there.....again I could be confused with something else?
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Old 05-29-2011   #230
 
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Yes, however I do know that his job/schedule takes him all over the world so he doesnt always have the time to chime, add to that the holiday weekend?

I thought the magazine article that spoke of the camaro discussed the use of the 8s as midbass drivers? I thought it said 300hz but I may have it confused with something else..... I also thought it said that they went down to 60 or 50 with a 15" taking over from there.....again I could be confused with something else?
I'm around, down in Mexico actually for some RnR for the long weekend.

Anyhow, we run the 8s up to 250Hz I believe. Very detailed and powerful with great control. They could go a bit higher, but with the 5.25" mids there is no need. You are right that the enclosure requirement for a midbass can be smaller, we are in the

if you do this. it'll help you. some sunny day ...
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Old 05-29-2011   #231
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

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Originally Posted by jim walter View Post
I'm around, down in Mexico actually for some RnR for the long weekend.

Anyhow, we run the 8s up to 250Hz I believe. Very detailed and powerful with great control. They could go a bit higher, but with the 5.25" mids there is no need. You are right that the enclosure requirement for a midbass can be smaller, we are in the
Thank you good sir! Enjoy the R&R!!!!
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Old 05-29-2011   #232
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Quote:
Originally Posted by jim walter View Post
I'm around, down in Mexico actually for some RnR for the long weekend.

Anyhow, we run the 8s up to 250Hz I believe. Very detailed and powerful with great control. They could go a bit higher, but with the 5.25" mids there is no need. You are right that the enclosure requirement for a midbass can be smaller, we are in the
in the...? Lol

So it can be smaller but does that mean that the 1/4 cube would be too large an enclosure for a midbass application?

Does the setup I described a few threads back sound reasonable? What would you recommend?

Thanks again for all this great info Jim. I feel very privileged to have such a valuble resource for knowledge right here at my fingertips.
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Old 05-29-2011   #233
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@Rex.
Input from you is valued too since you have so much experience with 8s. I hate to make the man work on his vacay.

@Jim Walter
Get off the computer and go drink a margarita for me Jim!
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Old 05-29-2011   #234
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

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@Rex.
Input from you is valued too since you have so much experience with 8s. I hate to make the man work on his vacay.
I appreciate the vote of confidence! However I have not used these puppies in any sort of fashion to have a thought on the midbass capabilities (low freq. ported box)..... NOTHING would surprise me though! I would assume a 1/4 cube would be fine for your needs and everything else in your setup (imo) is great!
No offense Jim....I dont feel bad for ya! You get to live out a dream that most of us would kill for (working at a high level in our favorite hobby) although I am sure the glammour disapears rather quick?
I still hope you have a great vacation though
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Old 05-29-2011   #235
 
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Originally Posted by jim walter View Post
I'm around, down in Mexico actually for some RnR for the long weekend.

Anyhow, we run the 8s up to 250Hz I believe. Very detailed and powerful with great control. They could go a bit higher, but with the 5.25" mids there is no need. You are right that the enclosure requirement for a midbass can be smaller, we are in the
Woah, tapatalk error.

That was a long winded reply explaining the demo car, and it's twin (system wise) we are building right now.

Cliffs:

if you do this. it'll help you. some sunny day ...
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Old 05-29-2011   #236
 
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And the cliffs don't even show up, LOL...that is the forum telling me to heed your advice and bail out for the rest of the weekend!

if you do this. it'll help you. some sunny day ...
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Old 05-29-2011   #237
 
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To answer the question before I bail. .15-.2 is fine down to 50Hz, no problem same as the demo car

if you do this. it'll help you. some sunny day ...
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Old 05-29-2011   #238
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

Stay thirsty my friend
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Old 05-29-2011   #239
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To answer the question before I bail. .15-.2 is fine down to 50Hz, no problem same as the demo car
Thanks a bunch! Have fun!
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Old 05-29-2011   #240
 
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

I have a 0.33cf sealed gross volume box with an Infinity Ref860w right now. I like the box size but would like a bit more extension and better SQ at higher volumes. Can you provide opinions on the following setups? Available power is 180w into 4 ohms or 300w into 2 ohms.

1x 843d at 300w in 0.33cf sealed (direct drop in replacement...would it be an improvement?)

1x 843d at 300w in 0.5cf ported

2x 823d at 300w (150w per) in 0.55cf sealed

Thanks
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Old 05-30-2011   #241
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

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I have a 0.33cf sealed gross volume box with an Infinity Ref860w right now. I like the box size but would like a bit more extension and better SQ at higher volumes. Can you provide opinions on the following setups? Available power is 180w into 4 ohms or 300w into 2 ohms.

1x 843d at 300w in 0.33cf sealed (direct drop in replacement...would it be an improvement?)

1x 843d at 300w in 0.5cf ported

2x 823d at 300w (150w per) in 0.55cf sealed

Thanks
As a dedicated sub for low end duty's in a vehicle I would say one ported with the 300 or so would yeild a little more output......although I have always been a "total cone area" guy?
Have to see if Jim can chime in on that one?
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Old 05-30-2011   #242
 
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers



Ready for vinyl! Currently wrapping it as I type this lol.

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Old 05-30-2011   #243
 
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers



A few more boxes and I'll get the vinyl thing figured out. I can't wait to hear it!

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Old 05-30-2011   #244
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

Not bad at all! Cant wait to hear what you think?
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Old 05-30-2011   #245
 
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

I got it in and had to go so I haven't had a chance to dial it in. Frow what I did hear I was very impressed! Very tight and responsive. I'm researching ways to set the gains. I've always done it by ear, but I dont feel comfortable doing that with this gear.

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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

I just ordered a pair of the dual 2-Ohm versions of these Type-Rs and can't wait to see/hear/feel (and hopefully not smell) what all the hype is about with these little monsters. My JBL GTO804s don't seem to like too much power from my XD600/1 so these Type-Rs should be a good replacement (the Polk MM840s were tempting). Time to make some measurements and cut some wood.
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Old 05-30-2011   #247
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

Hey Jim..... I know your on Vacation but when you get a free chance can you let me know if you think a 4" round port would be good or would two 2" ports be better? I am not going to go slot ported again since my last mathmatical error (what an idiot!!!!!!!!!) I have never had an issue with round ports in the past specifically 4"? I can go 2,3,6, what ever....
Thanks!
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Old 05-30-2011   #248
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

To add, Its going to be 1.4 total for the two 8s and will be tuned at 34hz (sound good?) My box now is more like 28 or maybe lower.....
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Old 05-30-2011   #249
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

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Hey Jim..... I know your on Vacation but when you get a free chance can you let me know if you think a 4" round port would be good or would two 2" ports be better? I am not going to go slot ported again since my last mathmatical error (what an idiot!!!!!!!!!) I have never had an issue with round ports in the past specifically 4"? I can go 2,3,6, what ever....
Thanks!
If I'm not mistaken, 1x4"=4x2" of port area

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Old 05-30-2011   #250
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Default Re: Alpine SWR-823D / 843D 8" Subwoofers

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To add, Its going to be 1.4 total for the two 8s and will be tuned at 34hz (sound good?) My box now is more like 28 or maybe lower.....
Just make sure and design the box so you can retune it if necessary.

Round vent - retune by removing the tube and cutting it to suit.

Slot vent - make part of the internal panel removable. Trim to suit.

Brian Steele
www.diysubwoofers.org
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