C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Speaker placement pre-78

Thread Tools
 
Search this Thread
 
Old Jun 6, 2007 | 08:28 PM
  #1  
GATOR454's Avatar
GATOR454
Thread Starter
Pro
15 Year Member
 
Joined: Aug 2003
Posts: 677
Likes: 5
From: Cary North Carolina
Default Speaker placement pre-78

Gator will be in storage for another two months so all I get to do is small stuff and plan, plan, plan.

For a long while I had been trying to find a good place to put rear speakers, but after lurking in quite a few audiophile forums it appears that I don't want them at all. From what I understand rear speakers would move the sound stage to the middle of the car or behind the seats, not good. Especially since the only thing behind someone sitting in a pre-78 vette is the rear window. Since the top of the rear storage area is about mid shoulder you wouldn't get very good sound from behind the seats anyway.

Here is a diagram of what I'm thinking:

Mid-Base drivers in the kicks 6" or 5.25", is bigger better or just overkill?
Mid-range and tweeters in or above the dash
Sub in Storage compartment firing down

I have some questions about the placement of the mids and tweeters
here is a drawing of the front:


I have a set of 2-way 4x6 speakers that I got for the dash. However, I had some tears in the vinyl where the small holes above the speakers were. I repaired the tears but it involved reinforcing the vinyl with plastic sheet and re-drilling the holes. All 1,146 of them.




If I go with the dash speakers I'm not sure I would get good sound out of them. Would it be better to cut the vinyl out of this section and mount them on the top of the dash?

I found a thread at mp3car.com that showed how to construct pillar pods for the mid-range and tweeters.




There were more pictures here is the link if you are interested:
http://www.mp3car.com/vbulletin/work...-tuning-6.html

Would this be a better alternative than the dash speakers which would be reflecting the sound off of the windshield. With the placement of the dash speakers and the slope of the windshield I think the direct path would be somewhere around your stomach. I think the pillar pods would raise the sound stage a bit, would that be correct.

A third alternative would be to have both.

Sub:
As you know there isnt much space behind the seats and I still want to be able to stow the T-tops there so my alternatives for sub placement are few.

Here is what I'm thinking about doing:

Forgive the drawing it is a quicky.

I think the best alternative is to hang the sub box from the rear deck and fire it down.

Here is a section through the box:


The section shows it being built in place with MDF but after much lurking in the mp3car.com fabrication section I think I'm going to make it out of fiberglass. My plan is to tape off the underside of the deck and the back wall and build the top and back in place. Then remove it and finish the front sides and bottom. I think it would be much better to be able to remove it. The down side would be fiberglassing upside down on a horizontal surface. Hard but not impossible. I would fasten it in place with brackets on the back wall and the flange under the rear window behind the trim.

I'm limited to a 10" driver because of clearance issues. Are there any thoughts on this. Would 2-8's be better?

I am also planning on putting the amps in a custom ventilated box in the spare tire carrier but that is a whole nuther story.

I know this is alot at one time but I wanted you to see the whole picture.

To summarize my Questions

Mid-range/tweeters
Dash speakers, pillar pods or both?
If Dash speakers, under or on top?

Mid-bass
5.25' or 6" is bigger better or just overkill

Sub
Will firing it down be OK
One 10" or two 8"

Thanks in advance for any insights.
David

Last edited by GATOR454; Jun 6, 2007 at 09:49 PM. Reason: I wouldn't win no spellin bee's
Reply
Old Jun 6, 2007 | 09:15 PM
  #2  
77Vette4S&J's Avatar
77Vette4S&J
Le Mans Master
 
Joined: Oct 2006
Posts: 8,168
Likes: 0
From: Pittsboro IN
Default

Reply
Old Jun 6, 2007 | 11:02 PM
  #3  
fronzo's Avatar
fronzo
Instructor
 
Joined: May 2006
Posts: 204
Likes: 0
From: Birnamwood Wisconsin
Default

Seems like the pillar speakers would be a bit in your face, but thats just me, nice ideas so far though!
Reply
Old Jun 6, 2007 | 11:52 PM
  #4  
gmg1977's Avatar
gmg1977
Racer
 
Joined: Apr 2006
Posts: 300
Likes: 0
From: Joplin Missouri
Default

I like the sub idea I was thinking of something similar. Please keep us posted on your progress
Reply
Old Jun 7, 2007 | 01:27 AM
  #5  
682XLR8's Avatar
682XLR8
Safety Car
Veteran: Army
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Dec 2005
Posts: 4,270
Likes: 20
From: Central Michigan
Default

[IMG][/IMG]

Here's how I dealt with the sub issue. It's not sealed, but it does what I need it to do
Reply
Old Jun 7, 2007 | 01:41 AM
  #6  
7T1vette's Avatar
7T1vette
Team Owner
15 Year Member
Community Builder
Community Influencer
Top Answer: 5
 
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Default

All good ideas. I would think the dash speakers would be better than the pillar idea...just because you have the whole windshield to reflect the sound (which it will do well with highs). Thus both you and the passenger will hear upper mids and highs very well. With the pillars being aimed at the passenger compartment, whoever is in line with the speakers will hear that one better than the other. I have decent 4 x 6" dash speakers and they do just fine [tweeters don't use a lot of power anyway]. Bigger is better in the kick panels; 5x7 or larger if you can make them fit. 2-way bass/mid-range speakers are best there. Woofers in the back if you think you need them. Keep low frequencies out of the dash speakers...it causes the small speakers to distort and you generate a lot of annoying rattles with the vibration (high-pass filters on dash speakers). Have fun!
Reply
Old Jun 7, 2007 | 03:18 AM
  #7  
E_Tar's Avatar
E_Tar
Le Mans Master
 
Joined: Mar 2006
Posts: 5,427
Likes: 1
From: Tracy California
Default

goegeous sketches and renderings man !!!
I need to do my speakers soon, will keep reading this thhread,
thanks.
Reply
Old Jun 7, 2007 | 08:29 AM
  #8  
Ganey's Avatar
Ganey
Race Director
10 Year Member
 
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Default

I did some testing & have been resisting doing a topic on it.
With the primary front speakers in the kick panels, this works:
Tweeters in kicks w/ dash grilles open.
While one would normally want the tweeters near the primary front speakers, nevertheless many separate them & this can work: Tweeters in dash location or in corners of dash.
Did not work good: Tweeters in doors or pillars.

5.25 is ideal for natural sound, expect better of axis response & can be angled some behind the factory kick panels. There is not enough air space volume in a C3 kick panel to optimize a 6 1/2 which should go in doors. If you try the plate speakers in the kicks, you might prefer them there- otherwise the dash location.

PS Rear speakers are a matter of preference. An advantage of front & rear speakers is full sound at low volume. At high volume only 1 set is needed.
It is possible to do excellent high SQ rear speakers. Equivalent to
2 8s facing forward & works great. http://forums.corvetteforum.com/showthread.php?t=634468
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Jun 7, 2007 | 09:10 AM
  #9  
vettfixr's Avatar
vettfixr
Le Mans Master
25 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 1999
Posts: 9,206
Likes: 17
From: Sewell NJ
Default

My experience with in dash 4 x 6 speakers is that they don't work well and create bad sound. They will not handle any appreciable power and tend to make the sound of the system have too much emphasis on the midrange. On my car i went with 5.25 in the kick panel and put add on tweeters in the dash where the 4 x 6 go. This gives a nice front soundstage. Rear speakers in an early C3 loose a lot of high range sound probably due to the shape of the rear compartment and the fact that they are pointing at the back of the seats. I have 6.5 Rockford Fosgates in the rear of mine and have to give them some treble boost at the amp to make them sound somewhat right. For a sub the easiest way to go is a self powered. I have a kenwood sub that I mounted on the rear panel and it works extremely well giving tight base. Here's an old link that shows a little more.

http://forums.corvetteforum.com/show....php?t=1049772
Reply
Old Jun 7, 2007 | 04:54 PM
  #10  
Durango_Boy's Avatar
Durango_Boy
Team Owner
 
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Default

Mids in kicks.
Tweeters in dash firing up.
Sub in back firing at any surface rather than open air.

By the way, the half way point between rear speakers and front speakers, as in divided when using two sets...would put the stage right in front of our heads. That's pretty much perfect and that's why my system has two sets of speakers.

Now, in most cases just fronts will sound amazing and won't require as much tuning as a four speaker setup.
Reply
Old Jun 7, 2007 | 05:38 PM
  #11  
Ak. Mal's Avatar
Ak. Mal
Race Director
10 Year Member
 
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Default

Just remember, the more space you put between the mid range speaker and the high range speaker will affect the dominance of the closer speaker. In this case, the higher frequency speakers will totally overpower the midranges by your feet.

Seriously, I keep reading about people wanting highs in the dash and mids by their feet. It makes me go every time.

I had a setup like that installed in my truck once. I thought it was fantastic. Then I saved up the coin and had a custom set of kicks made to hold my high end. HOLY SCHNIKEYS. Night and day difference in every single song I could listen to. Don't waste your time with the dash. I promise the difference between the two setups is remarkable.
Reply
Old Jun 7, 2007 | 06:50 PM
  #12  
68 NJConv 454's Avatar
68 NJConv 454
Melting Slicks
 
Joined: Jan 2006
Posts: 3,028
Likes: 2
From: North NJ
Default

Originally Posted by Ak. Mal
Just remember, the more space you put between the mid range speaker and the high range speaker will affect the dominance of the closer speaker. In this case, the higher frequency speakers will totally overpower the midranges by your feet.

Seriously, I keep reading about people wanting highs in the dash and mids by their feet. It makes me go every time.

I had a setup like that installed in my truck once. I thought it was fantastic. Then I saved up the coin and had a custom set of kicks made to hold my high end. HOLY SCHNIKEYS. Night and day difference in every single song I could listen to. Don't waste your time with the dash. I promise the difference between the two setups is remarkable.
Interesting post. I was thinking about the mids in the kicks and tweets near the wiper switch in the center consul. Now I must rethink.
I was going to do b/w 5.5 - 6.5" mids in the kicks, tweets in the gauge cluster and two 6.5" in the rear compartment and an 8" tube sube in the back with an AMP under the dash since i don't have a heater core anymore. Setup still in the air as I haven't bought anything although I'm pretty sure I'm close to biting the bullet.

BTW, awsome "quick" drawings

Question, why do all the newer cars have the bose mids in the doors and the tweets on the pillars if it would sound better together? even the high end cars have this setup.
Reply
Old Jun 7, 2007 | 07:48 PM
  #13  
Ak. Mal's Avatar
Ak. Mal
Race Director
10 Year Member
 
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Default

Originally Posted by 68 NJConv 454
Question, why do all the newer cars have the bose mids in the doors and the tweets on the pillars if it would sound better together? even the high end cars have this setup.

Because manufacturers have to cater to everyone, not just the audiophiles. Besides, anyone serious about car audio won't use anything that came stock anyways.

Most people wouldn't understand kick panel setups and the life of the speakers would be shortened by people thinking they are footrests.
Reply
Old Jun 8, 2007 | 04:18 PM
  #14  
GATOR454's Avatar
GATOR454
Thread Starter
Pro
15 Year Member
 
Joined: Aug 2003
Posts: 677
Likes: 5
From: Cary North Carolina
Default

Thanks for all of the replies.

Here are a couple replies I got on a couple Car Audio forums.

The pillar pods should theoretically give you better imaging, but proper aiming can make a substantial difference, high frequencies are very "directional". However an advantage of using the factory dash locations may be slightly better bass response..and possibly a stronger stage. It really should not matter if you top or bottom mount the speakers if you decide to go that route..the perforation's should be pretty much acoustically transparent. Now I have done systems in those year vettes before and the dash location worked well..however since I have not ever tried the pillar approach on those particular vettes, you may want to experiment before you cut or permenantly mount anything.

As far as midbass there really is no such thing as overkill IMO. The midbass frequencies are generally where most vehicle systems lack most..so I would say to use the largest speaker possible.

The sub firing down as per your diagram should work excellent..I highly reccomend doing it that way..and correct, you should not require any rear fill in that vehicle..the interior does not really warrant it, and it would pull the soundstage back..ok for loudness..not ok for sound quality. As far as using one 10 vs. two 8's...you will most likely get various opinions on that one.

Some people firmly believe that bigger is better,,some firmly believe multiple smaller drivers will have better sound quality and play "tighter" then single larger drivers. In actuality it really depends on the particular sub, as well as it's installation and enclosure design. In other words any size or number of speakers can sound better or worse then any size or number of speakers if all I mentioned is not taken into account.

Now all else being equal..and in my opinion, I would use the single 10'' if you are looking for more low end response..and use the two 8'' if you tend to listen to music that does not have alot of low end..such as older rock music. This is not to say one will sound extremely better then the other..just a vantage point to help with your final decision..I honestly believe either setup will sound great and produce plenty of low end in that car if it's installed properly and utilizing quality gear.
Dash or Pillar:
Under no circumstances use both. You never want two drivers of the same frequency that close together. Trust me it won’t sound good.

Whether or not you use dash speakers or pillar pod speakers will depend on personal preference. They both have their pro’s and con’s. You should install the Subs then experiment with the placement of the mid/tweeters and kicks.

If you go with the dash speakers then under the dash placement would be the least desirable. The overall sound would suffer from reflections from the windshield. I would recommend angling the speaker away from the windshield as much as possible. Directing the speaker at various angles may take some trial and error to achieve the optimum position. Start by aiming them towards the center of the car about head height, and go from there.

If you go with Pillar speakers aim them anywhere from directly towards each other to directly at the head of the opposite passenger. This is called off axis staging. Again, you want to minimize windshield reflection. Start with about 10 degrees off axis, and tilt them towards the opposite passenger until you get the sound stage you are looking for.

You could always put in both with an A-B switch and change them depending on the music or how you feel that day.

Kicks:
Bigger is not always better. I’m not sure what it looks like behind the kicks of an old Corvette but I bet there isn’t much room. Mid-basses like subs depend on the airspace around the driver to produce good sound. If you put in the 6” but don’t have adequate room behind the speaker it will sound flat. Pick the two drivers you are considering and determine their space requirements and see if it would be doable.

Also the same aiming of the kicks is the same as the dash mounted speakers. Just make sure you re-create the same airspace during testing that you anticipate in the finished kick enclosure.

Subs:
I think the placement of the sub that you show in your drawing would be ideal for your situation.

As for one 8” versus two 10” subs.:
I think the two 8” subs would be better than one 10” sub for SQ, if for no other reason than that you could invert one of them to greatly lower 2nd order harmonic distortion. As for SPL, by having 2 isolated voice coils you’re less likely to get power compression because the coils can better radiate heat, not to mention the fact that you only need half as much amplifier power to obtain the same loudness as with one sub.
Obviously there are exceptions. Also, with any given amount of power, the system with the most cone area is going to be more efficient, and so louder as well. You have to look at the twin sub setup as a single speaker with a larger cone area.

I would suggest getting a box analyzer like WINisd (do a search here there are several free ones) and plug various single 10” drivers double, 8” drivers, and maybe ever double 10’s if you can fit them and make your decision base on your desired frequency response curve.

If you go with two subs make sure you put them in separate air chambers. It's not that a single airspace will sound bad, it's the fact that if 1 woofer dies then the remaining one will be playing into a chamber that is way to big. This could damage the driver. Build each sub its own chamber so if one fails then you can still play the other. I've always built them that way.

Finally I think for your car rear fill speakers would do more harm than good for both SQ and staging. However if you just want loud and don’t care about Quality then the more the better.
Reply
Old Jun 8, 2007 | 04:38 PM
  #15  
Durango_Boy's Avatar
Durango_Boy
Team Owner
 
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Default

That's how it works. Two guys very skilled in the field of car audio and even their opinions vary. I agreed with a lot of what they said, and I agreed with some of it. But, that's how it goes with car audio. Too much of it comes down to personal experience and subjectivity.
Reply
Old Jun 8, 2007 | 05:00 PM
  #16  
68 NJConv 454's Avatar
68 NJConv 454
Melting Slicks
 
Joined: Jan 2006
Posts: 3,028
Likes: 2
From: North NJ
Default

I wonder if it would be worth posting audio files.

Car 1: mid speakers in the kick panels and tweets in the pillars or dash mounted.

Car 2: mid Speakers in the kick panels and tweets down near the kick panels.

Car 3: Whatever combination above with additional rear mounted speakers.

You'd have to use the same microphone and listening point...say head height on a 6ft male driver in the driver seat.

Same song....that song from Overhaulin hasn't been played out yet, just use that one. love the show, so tired of that darn song.

Even after the replies above I'm still leaning towards the mids in the kick panels as they are not directional and the tweets mounted at opposing passengers, whether mounted on the dash or pillars.
Reply
Old Jun 8, 2007 | 07:49 PM
  #17  
Ak. Mal's Avatar
Ak. Mal
Race Director
10 Year Member
 
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Default

Originally Posted by 68 NJConv 454
Even after the replies above I'm still leaning towards the mids in the kick panels as they are not directional and the tweets mounted at opposing passengers, whether mounted on the dash or pillars.
That is a very misleading statement. Mids are indeed directional. They just aren't as directional as the higher frequencies heard from the smaller speakers. Your sound quality will benefit from adding direction to your mids.

Your ears can hear from approximately 20Hz to 20,000Hz. The bottom of the scale is non directional, now as you move up in frequency, the sound becomes more directional. If you have seen a frequency response graph it is non-linear because of the definition of an octave. One octave is defined as the doubling of a frequency. So, 40Hz is one octave higher than 20Hz. 80Hz is two octaves higher etc... What I'm saying is, just because your mids are only playing 90-250hz, they are playing directional frequencies. More noticeably as they increase in value.
Reply

Get notified of new replies

To Speaker placement pre-78

Old Jun 14, 2007 | 09:09 PM
  #18  
ajrothm's Avatar
ajrothm
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Default

Gator, those are some AWESOME sketches man.....

about your system, I like the sub idea, upside down... COOL..

I will tell you that I just disconnected my speakers I had in the dash(4x6 2 way pioneers running off the hu), it makes my system sound much cleaner...especially when the tops are on and the windows are up... I think the reflection of the highs off the glass echos too much or something and sounds like distortion...or just general crap.

If you want good midbass, use the 6.5s.

I have the 5.25s componets and 70w rms going to them, they still do not offer any real bass. I mean yeah they try to thump a little but... they sound much better crossed over running at 100hz and just used for mids(vocals) and highs..

A 10" sub will make more bass then you need anyway.

I have the 5.25s in the kicks and tweets on the outside of the kicks facing upwards. There is plenty of highs and no funny distortion or echos from the windshield.

You have some great ideas!
Reply
Old Jun 14, 2007 | 09:20 PM
  #19  
ajrothm's Avatar
ajrothm
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Default

Here is my kick panel setup for those who care:



I know the placement of the tweets does not look safe but I have had no problems with people kicking them. They are a lot more solid then you think... I didn't want the 5.25s visible so we hid them behind the panels.
Reply
Old Jun 15, 2007 | 04:12 PM
  #20  
68 NJConv 454's Avatar
68 NJConv 454
Melting Slicks
 
Joined: Jan 2006
Posts: 3,028
Likes: 2
From: North NJ
Default

ajrothm, very clean. I like
Reply




All times are GMT -4. The time now is 03:04 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE