Free Shipping on All Orders 1-866-764-1801

Vist our Online Store
+ Reply to Thread
Results 1 to 19 of 19
  1. #1

    Member Sales Rating: (0)

    Join Date
    May 2011
    Posts
    3

    Default Crossover frequency for MM 6501

    I have a set of mm 6501 in the front door of my Mazda 3 and am running active through a JBL MS-8 processor. My question is what frequency should I crossover between the mid/woofer and tweeter?

  2. #2

    Member Sales Rating: (0)

    Join Date
    May 2011
    Posts
    5

    Default

    frequency or angular velocity does not change frequency is an integer or a number (angle l/r).

  3. #3

    Member Sales Rating: (0)

    Join Date
    May 2011
    Posts
    3

    Default

    hmmm. Maybe I should rephrase my question.

    I am using a JBL MS-8 sound processor in my Mazda 3. The MS-8 has the capability to specify what the crossover frequency can be between two drivers in a 2-way active setup. I have installed a set of mm 6501 components in my front door (6.5 inch woofer in the door, tweeter in the sail panel) and I am not using the stock passive crossover.
    My question is this: What frequency should I set the high pass crossover between the woofer and the tweeter? I could not find any specs on line as to what the passive crossover from polk is designed at.

  4. #4

    Member Sales Rating: (0)

    Join Date
    Dec 2003
    Location
    Chattanooga, TN
    Posts
    11,827

    Default

    Generally 4 KHz works best at least for a starting point.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

  5. #5

    Member Sales Rating: (0)

    Join Date
    May 2011
    Posts
    3

    Default

    thanks - I will use that.

  6. #6

    Member Sales Rating: (0)

    Join Date
    Feb 2010
    Location
    NY
    Posts
    698

    Default

    IIRC when i called Polk with that same quastion they said cut off for MM's passive x-over was at 3,200.
    Call Polk to verify but you don't have to follow that 100%.
    See what point sounds better in your car/install.

  7. #7

    Member Sales Rating: (0)

    Join Date
    May 2011
    Posts
    4

    Default

    I'm looking for the same info. May try to call at work tomorrow. It's the only piece of the puzzle that's missing right now and I'm shooting for a sunday install.

  8. #8

    Member Sales Rating: (0)

    Join Date
    May 2011
    Posts
    4

    Default

    Called support today and received an email response to use 3kHz w/ 12-18dB slope.

  9. #9

    Member Sales Rating: (0)

    Join Date
    Dec 2003
    Location
    Chattanooga, TN
    Posts
    11,827

    Default

    Hmmm, thats an awful shallow slope for tweeters. Youd be getting a lot of upper midrange coming thru with that, especially at 12 db/oct.

    Well since youve got an active crossover, might as well try them all. Also try the mids at 2KHz @ 12 db/oct and the tweeters at 4KHz @ 12 db/oct. Depending on the install and location, that can work. Im gonna say tho that both mid and tweet cut at 4 KHz @ 24 db/oct will likely sound the best.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

  10. #10

    Member Sales Rating: (0)

    Join Date
    Dec 2007
    Location
    New Delhi - India
    Posts
    813

    Default

    Polk will suggest slopes based on the passives slope. I think most passive xovers use shallow slopes. Reason could be, 99% of the buyers use components as a plug and play application with pratically 0 dsp. That and the manufacturers belief in the 'blend theory'. Shallow slopes for better blend.

    The balance 1% are going to ditch the passive anyways and will have enough dsp to know that its balance at the xover points and with whats above and below, that counts. Unlikely that you will get here with shallow slopes. Steeper slopes give much better tonality and imaging.

    I wonder how my car would sound if I just kept the steep slopes and turned off everything else ie TA / Eq etc..........I'll let you know this evening. Mac probably already knows the answer.....lol

  11. #11

    Member Sales Rating: (0)

    Join Date
    Dec 2007
    Location
    New Delhi - India
    Posts
    813

    Default

    Quote Originally Posted by arun1963 View Post
    I wonder how my car would sound if I just kept the steep slopes and turned off everything else ie TA / Eq etc..........I'll let you know this evening. Mac probably already knows the answer.....lol
    Without the TA and the eq, it sounds bad both ways

  12. #12

    Member Sales Rating: (0)

    Join Date
    Dec 2003
    Location
    Chattanooga, TN
    Posts
    11,827

    Default

    Quote Originally Posted by arun1963 View Post
    Polk will suggest slopes based on the passives slope. I think most passive xovers use shallow slopes. Reason could be, 99% of the buyers use components as a plug and play application with pratically 0 dsp. That and the manufacturers belief in the 'blend theory'. Shallow slopes for better blend.
    I dont know this for a fact but my theory is that manufacturers come up with their crossover points when designing speakers on the sound board. When you get the speakers in the car and one mid is 90 degrees off axsi while the other is 20 and the tweeters are mounted 3-4 feet away and also at different axis, thats gotta change how theyll respond.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

  13. #13

    Member Sales Rating: (0)

    Join Date
    Dec 2007
    Location
    New Delhi - India
    Posts
    813

    Default

    That's a valid point. It's very easy to imagine companies testing car ausio speakers on boards in a far field environment

  14. #14

    Member Sales Rating: (0)

    Join Date
    May 2011
    Posts
    4

    Default

    Quote Originally Posted by MacLeod View Post
    Hmmm, thats an awful shallow slope for tweeters. Youd be getting a lot of upper midrange coming thru with that, especially at 12 db/oct.

    Well since youve got an active crossover, might as well try them all. Also try the mids at 2KHz @ 12 db/oct and the tweeters at 4KHz @ 12 db/oct. Depending on the install and location, that can work. Im gonna say tho that both mid and tweet cut at 4 KHz @ 24 db/oct will likely sound the best.
    Roger that, I was planning on going with the 24 db/oct, I just want to be sure not send anything lower than the tweets will like. I'll probably try 4k to start and go from there. Just need the parts for my window so I can finish up the door and I'm in business. I'll post up the results.

  15. #15

    Member Sales Rating: (0)

    Join Date
    Dec 2003
    Location
    Chattanooga, TN
    Posts
    11,827

    Default

    What Im wondering is if that is the crossover point or the cutoff point. If you cutoff the mids at 2K at 24 db and the tweeters at 4K at 24 db, your crossover point is where the two meet at equal levels which would be something like 2.8K. Cause the crossover point of the SR's is 3.1K but the tweeters are cut off near 6.3 and the mids below 2K according to the Car Audio and Electronics magazine test on them. They ran a frequency response graph of just the mid and just the tweeter so you could see where they were rolling off independently.
    Last edited by MacLeod; 05-30-2011 at 11:40 AM.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

  16. #16

    Member Sales Rating: (0)

    Join Date
    Dec 2007
    Location
    New Delhi - India
    Posts
    813

    Default

    Well, the white paper on the SR 6.5's say that the xover frequency is 3100 hz with the mid cut at 12 db and the tweets at 18db. It doesn't say if Both drivers are cut at 3.1 or if 3.1 is the balance point based on staggered points. I've run the SR's actively x'd at 3.15 @ 24 db slope. I always felt that this was a bit lower than what the tweet could actually handle.

  17. #17

    Member Sales Rating: (0)

    Join Date
    Dec 2003
    Location
    Chattanooga, TN
    Posts
    11,827

    Default

    I know theyre not cut at 3.1. Thats just it, I cant find that link on the CA&E site (can find the review but not the freq response graph) but it plainly shows the tweeter starts rolling off around 6K and the mid at under 2. Ill keep digging and maybe I can find it somewhere.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

  18. #18

    Member Sales Rating: (0)

    Join Date
    Feb 2010
    Location
    NY
    Posts
    698

    Default

    Since this thread went into SRs - what effect will SR5250 passive x-over will have on a set of SR65000 speakers?

  19. #19

    Member Sales Rating: (0)

    Join Date
    Dec 2003
    Location
    Chattanooga, TN
    Posts
    11,827

    Default

    Probably negative cause the mids are cut off higher as is the tweeters.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Similar Threads

  1. 1.2TL crossover frequency
    By Janne in forum Vintage Speakers
    Replies: 5
    Last Post: 02-09-2011, 05:46 PM
  2. Crossover Frequency
    By Nightsbane in forum Basic Hookup/Wiring Questions
    Replies: 7
    Last Post: 03-22-2010, 04:49 AM
  3. How to set crossover frequency?
    By vinkalmann in forum Car Audio & Electronics
    Replies: 3
    Last Post: 06-29-2007, 02:28 AM
  4. crossover frequency?
    By hydrostream in forum Speakers
    Replies: 2
    Last Post: 01-13-2007, 06:35 PM
  5. Crossover Frequency = Important
    By VR3 in forum Subwoofer Hookup & Bass Management
    Replies: 3
    Last Post: 03-08-2006, 09:03 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts