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    calebkhill's Avatar
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    Rear fill gone, now a few questions.

    Well not completely gone, just attenuated from my front stage. Using the bridged mono attenuated from here:
    GlassWolf's Pages

    At first the volume sounded lower and the tone was hollow. I figured I just needed to get used to it. So I gave it a days listen. The second day I realized that as the volume level seemed only slightly decreased, everything sounded way more detailed. It was a crisper, defined sound, and the volume decrease must be the decrease in interference: interference = increased levels.
    Now that I'm getting more of a grasp on my front stage, I have a few questions.

    1.My front door speakers are beside the legs.when I move my leg I hear the change. The legs are getting in the way. Any suggestions to make up for some of this without any major mods to the door panel?

    2. Are 2" and 3" full range drivers interchangeable with 1" tweets?

    3.How can you set your amps frequencies accurately besides just guessing. Oscope or dmm method?

    4. How many and What speaker sizes for the front stage, and crossovers points and slopes would be ideal?

    5. Any other hints for setting up the front stage? Am I asking the right questions? Time alignment isn't an option at the moment Door treatment will be done later but besides that.







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    Re: Rear fill gone, now a few questions.

    what is your front right now? What, hu, drivers and amp? how are they crossed?



    Pioneer 80prs
    ...
    Rockford Fosgate t800.4, CDT ES-MO 6 mids, Digital Designs T2 tweets
    ...
    2 MB Quart DSC1500.1's strapped on 1 Tantric HDD 12
    Mike Singer 310 amp 6 phase
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    2 runs of Monster Cable 1/0

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    Re: Rear fill gone, now a few questions.

    My fronts are coax, but I'm upgrading to comps soon, probably PHD. Two fosgate punch tweets in the dash. 2 15 fosgate subs. Tweets at 3.5khz/12 passive, PhD's will be 63hz-80hz-3.5khz, subs 80hz. Thinking about band passing the doors, but setting amps frequency range is a guessing game it seems.




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    Re: Rear fill gone, now a few questions.

    Well you're sensing the difference when you move your leg because that full range signal is trying to bounce around your leg. Upgrading to components and placing them either in the sail panels or (ideally) at least 2" above the dash should help dramatically with that. As for driver choices, you can really benefit from that midrange/midbass impact by going with the largest driver you can fit in the doors. If I was careful and clever on the VW, I could probably run 8" midranges and just let the passive crossover adjust things for me, but I don't have too much to complain about with what I currently have. If you get the PHDs, just set your HPF and let the crossovers do the rest.



    Deck: JVC KD-A95BT
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    Re: Rear fill gone, now a few questions.

    Also, if you have time and patience, I remember reading that you can set your crossover by playing a test tone recorded at your desired crossover frequency then monitoring a dmm while you adjust the crossover point on your amp. You'll reach the right point when the signal cuts down to 1/2 of what it was. Basically how the SMD CC-1 operates IIRC.



    Deck: JVC KD-A95BT
    Speakers: PHD FB mid, JBL MS tweets
    Amps: Boston Acoustics GT-2125, Zed Minotaur III (x2)
    Sub: 10" SSA ICON, IA Death Penalty 18" (coming soon)
    Starr Mountain Sound Nuthugger #2 (I'm a #2 lol)
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    Re: Rear fill gone, now a few questions.

    Oh and one more thing: I would actually do door treatment FIRST. At least with CLD tile. AT's stuff really isn't that expensive and 24sqft should be more than enough to do all 4 doors. It's a pretty remarkable improvement just from that and will keep you from feeling like you wasted money if you do get those PHDs. They really deserve a good home.



    Deck: JVC KD-A95BT
    Speakers: PHD FB mid, JBL MS tweets
    Amps: Boston Acoustics GT-2125, Zed Minotaur III (x2)
    Sub: 10" SSA ICON, IA Death Penalty 18" (coming soon)
    Starr Mountain Sound Nuthugger #2 (I'm a #2 lol)
    dcarcustoms Nuthugger #1
    Spotify: http://open.spotify.com/user/neo_styles/playlist/6t9ru42j0wbEsuo4bXqXD8
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    Re: Rear fill gone, now a few questions.

    One thing that's frustrating about forums is that information sharing only goes so far and interpretation ruins a lot of it. I wish I could travel around to each one of you guys providing guidance, sharing information that way, doing instead of saying. You need practical experience and actual references to what's being said and that is severely lacking in many of these conversations. Many of you don't have a true reference for live un-amplified performances or frequencies in general and it comes through in your questions and suggestions. I'm not attacking anyone, please understand that. Just had a thought and wanted to give a perspective. Setting up front stage is actually very easy, but without references and practical experience, discussing it makes it seem arduous. What's needed is a true understanding of exactly what frequencies affect different instruments and voices and such, but also excursion and power handling relative to those frequencies. Add to that, power response (on and off axis), filter poles (shallow to steep), phase and time coherency (probably four or five people on this site who even understand the true principal behind this), end goals (SPL or realism), etc... it's no wonder we misinterpret and misinform. Myself included!

    Random rant, food for thought, what have you...


    neo, that sig is hilarious.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by ciaonzo View Post
    One thing that's frustrating about forums is that information sharing only goes so far and interpretation ruins a lot of it. I wish I could travel around to each one of you guys providing guidance, sharing information that way, doing instead of saying. You need practical experience and actual references to what's being said and that is severely lacking in many of these conversations. Many of you don't have a true reference for live un-amplified performances or frequencies in general and it comes through in your questions and suggestions. I'm not attacking anyone, please understand that. Just had a thought and wanted to give a perspective. Setting up front stage is actually very easy, but without references and practical experience, discussing it makes it seem arduous. What's needed is a true understanding of exactly what frequencies affect different instruments and voices and such, but also excursion and power handling relative to those frequencies. Add to that, power response (on and off axis), filter poles (shallow to steep), phase and time coherency (probably four or five people on this site who even understand the true principal behind this), end goals (SPL or realism), etc... it's no wonder we misinterpret and misinform. Myself included!

    Random rant, food for thought, what have you...


    neo, that sig is hilarious.
    Experience does go along way. Thanks for that.




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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by neo_styles View Post
    Well you're sensing the difference when you move your leg because that full range signal is trying to bounce around your leg. Upgrading to components and placing them either in the sail panels or (ideally) at least 2" above the dash should help dramatically with that.
    I understand this. I feel I need to raise more of the sound above the legs because everything under 3.5khz is getting blocked.
    And when you say components above the dash 2", you do mean the tweeters right. Also, are 2"and 3" full range drivers interchangeable with tweets. All seem to have the same frequency response. Reason I ask is if I don't go three way, a 3"and 6.5" driver seems like it could cover a larger frequency range and you could be a little more flexible with crossover points to get more efficienct response from your drivers. Get what I'm saying?




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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by calebkhill View Post
    I understand this. I feel I need to raise more of the sound above the legs because everything under 3.5khz is getting blocked.
    And when you say components above the dash 2", you do mean the tweeters right. Also, are 2"and 3" full range drivers interchangeable with tweets. All seem to have the same frequency response. Reason I ask is if I don't go three way, a 3"and 6.5" driver seems like it could cover a larger frequency range and you could be a little more flexible with crossover points to get more efficienct response from your drivers. Get what I'm saying?
    There have been quite a few SQ setups that used a wideband 3 or 4-inch, dedicated midbass, and no tweet. Just plan to spend a lot of time either dialing in your crossover frequencies or EQ-ing all the boosts caused by overlapping if you do go with a midrange. The one flaw of a lot of midranges, some say, is the fact that while they extend high into the range, it's not up past the 12-16k range where things can sometimes lose their "sparkle." Honestly, I think it's subjective and if you want to go wideband midrange instead of tweet, knock yourself out.

    As far as the stuff disappearing behind your knee comment, TA will help to a certain extent, but won't be a cure-all.

    And for the 2" above the dash, yes, I meant the tweeters. Ideally, they should go in spheres and at least 2" above the tallest point on the dash with a dash mat covering all the smooth surfaces to minimize reflections.



    Deck: JVC KD-A95BT
    Speakers: PHD FB mid, JBL MS tweets
    Amps: Boston Acoustics GT-2125, Zed Minotaur III (x2)
    Sub: 10" SSA ICON, IA Death Penalty 18" (coming soon)
    Starr Mountain Sound Nuthugger #2 (I'm a #2 lol)
    dcarcustoms Nuthugger #1
    Spotify: http://open.spotify.com/user/neo_styles/playlist/6t9ru42j0wbEsuo4bXqXD8
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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by neo_styles View Post
    There have been quite a few SQ setups that used a wideband 3 or 4-inch, dedicated midbass, and no tweet. Just plan to spend a lot of time either dialing in your crossover frequencies or EQ-ing all the boosts caused by overlapping if you do go with a midrange. The one flaw of a lot of midranges, some say, is the fact that while they extend high into the range, it's not up past the 12-16k range where things can sometimes lose their "sparkle." Honestly, I think it's subjective and if you want to go wideband midrange instead of tweet, knock yourself out.

    As far as the stuff disappearing behind your knee comment, TA will help to a certain extent, but won't be a cure-all.

    And for the 2" above the dash, yes, I meant the tweeters. Ideally, they should go in spheres and at least 2" above the tallest point on the dash with a dash mat covering all the smooth surfaces to minimize reflections.
    I see. You say some say, you have any experience with 2" and 3" drivers? I definitely don't want to loose tweet. My goal is to have the whole frequency range playing as detailed as possible. I thought if doin a two way set up I could use a 3" so I could band pass the 6.5s a little lower.
    So let me ask, how high into the range does a 6.5 start to break down. It seems like they play frequencies up to about 2.5 great, id like to cut them off somewhere around there. maybe run a 3" 2.5-4k, tweet 4K ->
    Maybe I'm wrong I haven't had time to research lately.

    Edit: Also I figure going 3 way I could place the smaller drivers higher up to bring more frequencies above the legs which would mean raising the stage right? Also, when I ask about using a 2" or 3" in place of a tweeter I'm thinking I could bring more frequencies higher up in a2 way setup.
    Last edited by calebkhill; 02-10-2013 at 04:23 AM.




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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by calebkhill View Post
    I see. You say some say, you have any experience with 2" and 3" drivers? I definitely don't want to loose tweet. My goal is to have the whole frequency range playing as detailed as possible. I thought if doin a two way set up I could use a 3" so I could band pass the 6.5s a little lower.
    So let me ask, how high into the range does a 6.5 start to break down. It seems like they play frequencies up to about 2.5 great, id like to cut them off somewhere around there. maybe run a 3" 2.5-4k, tweet 4K ->
    Maybe I'm wrong I haven't had time to research lately.

    Edit: Also I figure going 3 way I could place the smaller drivers higher up to bring more frequencies above the legs which would mean raising the stage right? Also, when I ask about using a 2" or 3" in place of a tweeter I'm thinking I could bring more frequencies higher up in a2 way setup.
    Yeah, never run wideband mids in my car but I have seen it done successfully on quite a few cars. Some have just taken the round vents in their cars and popped the widebands in there to get them on-axis and it worked great.

    Every 6.5" is built differently, but a lot of the consumer models tend to break up once you pass the 2-2.5k region. Some, like the EAD models, don't break up until well past 8k, but the price reflects it.

    If you're planning to use a wideband mid in a 3-way setup, it might be a real smart idea to have someone make some fiberglass pods for your mids and tweets and put them on the dash in between the a-pillar and the windshield (in that deep corner). It keeps it easy to align the drivers to not only be as close to on-axis as possible, but makes TA and EQ much easier. Just keep in mind the 80prs is meant for 2-way front stage plus sub, so you have to be creative with making a sub work with the 80prs.



    Deck: JVC KD-A95BT
    Speakers: PHD FB mid, JBL MS tweets
    Amps: Boston Acoustics GT-2125, Zed Minotaur III (x2)
    Sub: 10" SSA ICON, IA Death Penalty 18" (coming soon)
    Starr Mountain Sound Nuthugger #2 (I'm a #2 lol)
    dcarcustoms Nuthugger #1
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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by neo_styles View Post
    Yeah, never run wideband mids in my car but I have seen it done successfully on quite a few cars. Some have just taken the round vents in their cars and popped the widebands in there to get them on-axis and it worked great.

    Every 6.5" is built differently, but a lot of the consumer models tend to break up once you pass the 2-2.5k region. Some, like the EAD models, don't break up until well past 8k, but the price reflects it.

    If you're planning to use a wideband mid in a 3-way setup, it might be a real smart idea to have someone make some fiberglass pods for your mids and tweets and put them on the dash in between the a-pillar and the windshield (in that deep corner). It keeps it easy to align the drivers to not only be as close to on-axis as possible, but makes TA and EQ much easier. Just keep in mind the 80prs is meant for 2-way front stage plus sub, so you have to be creative with making a sub work with the 80prs.
    I don't have the 80prs. But I should be able to get everything right. I'll run my tweets and mids off the front pre outs and run the front and rear off the rear pre outs and use crossovers and gains to control the levels. I'll do ta later on.
    I well eventually get fiberglass molds done for the a pillars. Id like to do them myself, but do you know someone who does them?
    I'm going to have to figure out how to solve the "legs" situation though, this is going to be a major problem.




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    Re: Rear fill gone, now a few questions.

    @ciaonzo ; @neo_styles ;

    could someone explain to me what on/off axis means?




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    Re: Rear fill gone, now a few questions.

    Quote Originally Posted by sjv13 View Post
    @ciaonzo ; @neo_styles ;

    could someone explain to me what on/off axis means?
    On axis just means the speaker is pointed at your head or as close as possible. Most tweeters/drivers perform best directly on axis and start to wane in wide-range FR the further off axis they go. Here's an example using the FR curve of the Vifa XT-25 ring radiator tweeter(courtesy of Madisound):



    Axis response is color-coded, so the black line is directly on-axis, purple is 15 degrees off axis, and red is 30 or 45 degrees off axis. Obviously the more off axis you get, the more attenuated the upper range will be even though they all play consistenly until about 2K.



    Deck: JVC KD-A95BT
    Speakers: PHD FB mid, JBL MS tweets
    Amps: Boston Acoustics GT-2125, Zed Minotaur III (x2)
    Sub: 10" SSA ICON, IA Death Penalty 18" (coming soon)
    Starr Mountain Sound Nuthugger #2 (I'm a #2 lol)
    dcarcustoms Nuthugger #1
    Spotify: http://open.spotify.com/user/neo_styles/playlist/6t9ru42j0wbEsuo4bXqXD8
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