wtk: sub for midbass?

Postby **nervewrecker** » June 3rd, 2009, 9:16 am

I seeing most of these midbass drivers that are capable of responding to frequencies around 35hz are worth a small fortune.

i am wondering if it is plausible to use a sub like a rf p1 8" or something to make up for frequencies bewteen mid 40hz - upper 60's (possily 70's) & a pair of compts for the midrange from 60hz up.

how well will the voicecoils in these subs respond to vocals (Im not sure if tone is the appropriate term).

im seeing here in a sealed enclosure they respond well to frequencies bewteen 40hz - 60hz http://www.rockfordfosgate.com/rftech/l ... evA-TS.pdf

Aimar · Postby **Aimar** » June 3rd, 2009, 10:01 am

Where will these midbass spkrs be placed and how will they be bandpassed?

Why not have the sub play from 50hz down and use a good set of comps that can play till about 60-65 with good output.

Keep it simple :wink:

Postby **nervewrecker** » June 3rd, 2009, 10:08 am

I find 50hz a bit boomy, I dont know if I am going about this the wrong way but if one was to port an enclosure at around 35hz wouldnt you be spiking the freq response of the sub around there +/- a 10hz & not get so much of a response at the high frequencies.

I know it cant go on my doors, the higher frequency drivers will be placed there. so that is another problem, under the seat sounds like a bad idea as well because of the fact that it will hinder the midrange from comming through.

im trying to avoid putting them on my backdash as well because of the fact that I will have to cut to fit.

as to bandpassing...well Im doing some reading on this still :oops:

southside connections · Postby **southside connections** » June 3rd, 2009, 11:06 am

audioconrtol 4xs solves you problem here with reguard to a 4 way set(ie 3 way frontstage plus subwoofer)

this can be done, but you will need a pair of subwoofers that can fit you door,and be infinite baffle-

perfect sub for you is the elemental designs 7kv2

next,midbass, well in you almera you can easily place a pair of midbass drivers in the kicks,and tweeters at your a-pillars

try it,see if it works out

but,remember you door has to be highly dampened

Postby **nervewrecker** » June 3rd, 2009, 11:18 am

southside connections wrote:perfect sub for you is the elemental designs 7kv2

next,midbass, well in you almera you can easily place a pair of midbass drivers in the kicks,and tweeters at your a-pillars

can a sub play mids at all?

kicks you say, that sounds like it calls for fiberglass, I trying to stay away from straying from the stock appearence of the car too.

I only willing to sacrifice my backseat (outside with that!).

theblitz · Postby **theblitz** » June 4th, 2009, 7:32 am

^^^ you mean you trying to KEEP the stock appearance of the car?

But you don't need the sub to play all mids... you want it to play mid-bass. What range of frequencies do you consider to be midbass?

Postby SR » June 4th, 2009, 7:47 am

what vehicle and what are you trying to achieve

a good set of components will work in most applications
and they dont have to cost an arm an a leg

Racegod · Postby **Racegod** » June 4th, 2009, 10:35 am

slacker_jack,

you coming the SQ event on the 7th?...

Postby **nervewrecker** » June 4th, 2009, 11:03 am

^^^

yea, I think I destroyed my rear speakers though, they not sounding right (sub in trunk & seat intact, nowhere for air to go).

front stage & bass alone ftw.

I will have to neaten up my system if I get a chance over the weekend too.

sr, well baiscally I want something fairly loud (to match a bassline of approx 750 - 1000 rms) but not gallery loud & still able to have that rumbling low frequency bass.
I was thinking of setting my sub lpf to somwhere around the mid - high 40"s & most average priced component speakers have a frequency response from as low as 60hz (i dont want to strain the speaker to its limits in the low frequency regions) but this leaves a gap bewtten the mid 40's & high 60's or possily the 70's. I looking to be able to compensate for this. amongst the cheapest componet speakers I saw so far that capable of hitting the 30's are some alpines ( http://www.alpine-usa.com/US-en/product ... g=en&tab=F ) that reatils for U.S. $650.00 & I have a feeling I might need more than 1 pair to match the bassline I have in mind. but with a nice 4 ch amp & 2 comp's up front I was thinking I may be ale to employ 2 8" subs to compensate for the missing andwidth although it may be narrow.

the system is basically for daily listening. car is an almera.

blitz, yes I want to keep the stock appearence of the car. midass for me starts from about 50hz, I find if that frequency is too prominant in my sub it sounds too boomy.

madman.devin · Postby **madman.devin** » June 4th, 2009, 11:18 am

Try your sub in a sealed enclosure that should help with the "boomy-ness" and set ur lpf on ur sub a lil higher, now all u need is a normal component set.

Postby SR » June 4th, 2009, 12:18 pm

a good component set will play from 50hz and up quite easily

Postby **nervewrecker** » June 4th, 2009, 12:41 pm

SR wrote:a good component set will play from 50hz and up quite easily

& will put quite a dent in my pocket too :oops:

Postby SR » June 4th, 2009, 12:44 pm

$1175 dls rs6a's

can be demoed on sunday for you

kurpal_v2 · Postby **kurpal_v2** » June 4th, 2009, 12:51 pm

SR wrote:$1175 dls rs6a's

can be demoed on sunday for you

You made a mistake or like being serious? :shock:

Postby SR » June 4th, 2009, 1:20 pm

my bad

$1145

http://forums.trinituner.com/forums/vie ... p?t=240380

Postby **nervewrecker** » June 4th, 2009, 1:48 pm

SR wrote:$1175 dls rs6a's

can be demoed on sunday for you

looking forward to it.

but out of curiousity how many pairs of these 6.5" you feel might be requireed to match the bassline of a RE SX 15" or Alpine type R 15"?

Aimar · Postby **Aimar** » June 4th, 2009, 2:14 pm

but out of curiousity how many pairs of these 6.5" you feel might be requireed to match the bassline of a RE SX 15" or Alpine type R 15"?

How about thinking the other way round :idea:

How can u get the 15'' sub to match(blend) with ur midbass :wink:

Postby **- Rovin's car audio -** » June 4th, 2009, 2:30 pm

slacker_jack,

i have dropped my sub lpf from 60hz to 50hz so sunday take a listen & hear if 50hz on d sub is 'too boomy' for u - comps is picking up front 50hz go up ... :wink:

Postby **nervewrecker** » June 4th, 2009, 2:42 pm

(...Rovin...) wrote:slacker_jack,

i have dropped my sub lpf from 60hz to 50hz so sunday take a listen & hear if 50hz on d sub is 'too boomy' for u - comps is picking up front 50hz go up ...

Postby **nervewrecker** » June 5th, 2009, 9:56 pm

something like what it has here is on my mind but i just want the midbass to be able to respond to lower frenquencies & be a bit loudish.

Postby **nervewrecker** » August 25th, 2011, 9:53 pm

so now that I know the correct term is not midrange (midbass) & I see it has been done already, what are some other eligible candidates besides the rockford p1 & ED 7kv2?

desired specs:

- 8" diameter
- more than 100 watts rms power handling.
- dual 4 ohm or single 2 ohm

considering band-passing at 45 -50hz to approx 150 - 200hz, in an enclosure (dont worry about where or how).

midrange drivers already figured out.

3stagevtec · Postby **3stagevtec** » August 26th, 2011, 11:06 am

nervewrecker wrote:I find 50hz a bit boomy, I dont know if I am going about this the wrong way but if one was to port an enclosure at around 35hz wouldnt you be spiking the freq response of the sub around there +/- a 10hz & not get so much of a response at the high frequencies.

I know it cant go on my doors, the higher frequency drivers will be placed there. so that is another problem, under the seat sounds like a bad idea as well because of the fact that it will hinder the midrange from comming through.

im trying to avoid putting them on my backdash as well because of the fact that I will have to cut to fit.

as to bandpassing...well Im doing some reading on this still

Don't forget vehicle transfer function (cabin gain). It's effect on the lower (sub) frequencies usually helps smoothen out the response. Remember the plots you get from most enclosure design software does not factor this in.

If your enclosure has a noticeably peak in its response, try adjusting the enclosure to eliminate that. i.e. line the interior with a layer of dacron, or adjusting the tuning freq etc..

Trying to use an additional 8" for midbass is a waste imo. Two pairs of well installed components should more than satisfy, even with your sub..

Postby **nervewrecker** » August 26th, 2011, 11:18 am

nope, moar midbass needed, i'm gathering information for 3 way.

It seems I get a spike in the middle 30's in the car so I am going for tuning in the high 20's.

3stagevtec · Postby **3stagevtec** » August 26th, 2011, 11:34 am

Ever did an RTA on the vehicle?

evolution7tt · Postby **evolution7tt** » August 26th, 2011, 11:50 am

nerve,

Do it. It on sale now. You already know how it sounds.

Postby **nervewrecker** » August 26th, 2011, 4:18 pm

^^^

you get permission to post that picture from the owner of that install? :lol:

mine is not going in the door & im exploring other options for now....but seems like people not considering this option at all...

nigel1977 · Postby **nigel1977** » August 26th, 2011, 7:03 pm

I might have a pair of L8v1's out of my Hilux for sale.

As for the midrange in your doors, you dont have the processing for it, as yet.

evolution7tt · Postby **evolution7tt** » August 26th, 2011, 7:14 pm

nervewrecker wrote:^^^

you get permission to post that picture from the owner of that install?

mine is not going in the door & im exploring other options for now....but seems like people not considering this option at all...

Yes I did. :mrgreen:

Nigel's option is great, if your budget allows. I am sure he will give you a good price on those.

As for placement, this, I find interesting.

evolution7tt · Postby **evolution7tt** » August 31st, 2011, 6:39 pm

Any updates on this nerve?

Postby **nervewrecker** » September 1st, 2011, 9:23 pm

Well so far I basically sit back & let the guys at DIYMA discuss it for me (plus I working on my enclosure), turns out some dude wants to put 10's on his doors. But I am seeing quite a few people recommending pro audio drivers for that application.

Where you get the sketch up from btw?