Jump to content

linearpower

Moderator
  • Content Count

    444
  • Joined

  • Last visited

  • Days Won

    43

Everything posted by linearpower

  1. Well, we took trophys home in three classes at MECA World Finals as well as other trophys for other accompi\lishments. We had Josh Kleckner win the coveted Best of the Best in MECA for the overall best SQ, SPL and Install scores combined. Herman Smith won Meca Head of the Year, he also won top score in Modified division for the year, with the highest points. I took third place in Masters Class out of 5 contestants with nothing but our two way 6.5 inch Passive components and a LP2250 in the Escape, with no external processing just he Kenwood DNX9980 A/V headunit. Linear Power Inc. won Manufacturer of the Year again, for the 3rd straight year. At Spring Break Nationals, we took 1st place in Street Class, 2nd in Modified, 3rd in Modified, and I took 2nd in Masters Class, again with only our LP6.5CP two way 6.5 inch passive component set and the 2250. We had people standing in line all day both days, to hear the Escape in the Audiophile Listening Area and Herman/s Dodge truck in the main booth.
  2. linearpower

    Can I Bridge My Lp 4753Iq?

    You can run two channels bridged using the internal crossover switch and the other two channels in 4 ohm stereo. If the bridged channel has a 4 ohm mono load on it, the power supply has to be set to 2 ohm setting. This allows the amp to work properly bridged into this load but it will reduce the power to the full range channels some. All this should be in the manual.
  3. linearpower

    Can I Bridge My Lp 4753Iq?

    You are wanting to run it actively, one half (2 channels) to tweeters and the other half to woofers? You have a two way component set?
  4. linearpower

    Can I Bridge My Lp 4753Iq?

    When bridging an 8 ohm load and running 4 ohm stereo simultaneously on the same two channels that is the same as a 2 ohm load per channel. This is why the amp has to be in the 2 ohm taps.
  5. linearpower

    Can I Bridge My Lp 4753Iq?

    You have to run an 8 ohm bridged load along with a 4 ohm stereo load with the power supply set to 2 ohms to run mixed/mono (stereo and mono) at the same time. Of course if you are running the other two channels 4 ohm stereo, their output will be reduced some by running the amp with the 2 ohm taps. You would also have to wire a passive crossover ( inductor coil) into the speaker wires going from the amp to the sub to crossover the low output which eats up power also and causes a phase shift. You cannot use the internal electronic crossover set for low pass if you want to play stereo full range off the same channels at the same time. It's much better to just run the amp using the internal active crossover and use one half the amp (2 channels) for the sub and the other two channels for full range speakers.
  6. linearpower

    Teamcapri 1992 Mercury Capri Xr2

    CoverKing custom makes dash pads for almost any application.
  7. linearpower

    Teamcapri 1992 Mercury Capri Xr2

    Depends on the dispersion angle of the speaker and where it is pointed, but even forgetting that the dashmat still helps the sound to keep sound from bouncing around the dash and windshield. We had the tweeters on the Door sail panels before and it still helped.
  8. linearpower

    Teamcapri 1992 Mercury Capri Xr2

    Yes, the dashmat absorbs sound that would normally reflect off the hard dash plastic. These out of phase reflections muddy the stage and imaging.
  9. linearpower

    Older(90's) Blues 8" 4Ohm Speaker Specs

    The enclosure volume for the ISO-KIT is roughly half the volume of one standard woofer. The enclosure volume is AFTER the displacement of the woofer and any port. A ISO-KIT 8 takes up .18 CF if the complete unit is in the enclosure. If only the rear woofer is mounted in the enclosure, the displacement would only be around .05 CF. hardly worth adding it to the calculations. The older woofers (from the late 1980's or early 90's) have a higher Fs and a larger enclosure requirement than the new speakers do. The new ISO-KIT 8 will work in as low as .35 CF, we recommend .5 CF as a good compromise. The older ISO KIT 8 will need a minimum of about .55 and a recommended enclosure of ,65 to .75 CF. The larger enclosure volume will help increase low frequency output and offset the higher Fs of the driver.
  10. linearpower

    Older(90's) Blues 8" 4Ohm Speaker Specs

    I can try to dig those specs up on the old 4 ohm 8's.The ISO-KIT specs are not going to help, that was for two 8 ohm 8's and would not be the same due to the impedance, and also would not measure the same as two 8 inch speakers tested separately.
  11. linearpower

    Taylor's 2003 Ranger Extended Cab

    Cool good luck with the build, waiting to see more! ISO loading your subs does several things. It cuts down on cone distortion, it gives greater dynamics and punch, it requires half of the air space to make the same bass as one woofer, with two motor structures it will handle more electrical power. Kicker Solobaric or any other small box woofer was designed under the same theory as isobaric design. The only characteristic that they maintained with the traditional isobaric design was the use of a smaller enclosure. To have one woofer act in theory like two woofers in a isobaric enclosure the moving mass has to double. To have one cone weigh twice as much as normal reduces efficiency, it also requires a heavier suspension to keep it under control ( you have to be able to start and stop the heavier weighted cone ) this makes a slower, more muddy less dynamic bass. Motor structure is also increased to try to increase drive to this heavier and stiffer assembly. Which is all counterproductive to dynamic natural bass response and requires even bigger amps to move this monster that has now been cleared. It has one purpose now and that is more of a SPL woofer not for quality sound. A isobaric loaded pair of highly efficient lighter suspension and light weight coned woofers have greater transient response and dynamics. Since the two drivers are air coupled in the tightly sealed small area between the two drivers all the acoustic energy from the rear speaker is driven into the front speaker cone re-enforcing the energy already driving the front cone. Isobaric design gives you more bass from smaller space, but it doesn't ruin the sound quality aspect of your bass response to get it. It can actually improve your bass. The ISO-KIT 8 and 10, are premade kits that just drop in a standard 10 inch or 12 inch woofer location. They require no work from you to fabricate anything other than a basic sealed or ported enclosure. And the clear cylinder that attaches the two drivers, minimize the air space in the sealed compartment between the two speakers which further increase the effect and efficiency.
  12. You aught to have been showing your car enough now that it is making a considerable impression with the opposing teams. I hope you can generate sales of the product with your hard work and competitions.
  13. I stay away from processors if at all possible. Just look for a head unit that has the needed EQ and time alignment features built in. As SQaudio has shown, as well as others, our systems need very little correction in response.
  14. Where u getting 8's from?? iSO-KIT?
  15. Mike had no time alignment in the Trailblazer either, and ran a passive set of components. The 8's do have somewhat reduced detail in the mid but also seem to have a greater warmth in the vocal. It's a give and take. Yes, an EQ would iron the small differences out. Also, time alignment and the use of an active set should reduce or completely correct any rainbow effect of sound pulling to the doors. Time alignment even on a passive component set should help reduce the rainbow effect considerably.
  16. Johnny is correct, you would not want to fire speaker from each end, the cancellation would hurt as well as it would be impossible to time align the two. One ISO-KIT 8 is very impressive for the acoustical output, and is much more musically accurate than a single driver. Tuning it to 24-28 Hz with a 2 inch up to a 2.5 inch port work best. Firing the speaker forward into dash area will simplify getting the bass to time align to the front. You only want an enclosure volume of around .4 to .5 cubic feet for the ISO-KIT 8 after subtracting for the speaker displacement (.18 cf) and what ever the port takes up if you port it internally. If external the port area will not subtract from air space.
  17. I would use just the balance function of the radio. It would be the easiest way to adjust attenuation. Adding a passive attenuation to just the tweeter is not hard to do but it will cause phase shift. Trying to attenuate the full component set passively will be much harder due to the power requirements of the attenuation parts just to handle the power output of the amp. Attenuation used at low level pre-amp signal whether by balancing of level controls would work nuch better.
  18. Well after 3 weeks of assembly, running to get sheet metal work, graphics and ordering last minute, overlooked items the new prototypes of what will be the néw line of Linear Power amps are finished. They do the lineage of the product proud, the exceed all capabilities of the old product and exceed expectations derived from the mathematics. The design parameters were to produce 150 watts RMS per channel at 12 volts, and mathematics said we would, in practice we got 166 watts RMS per channel. The amp makes seriously more than this at higher battery voltage. We have not had time to get all specs on the amps but will have more in a few days, we ran out of time before CES. Jeri, is back in the tech room running more tests on the engineering unit as I type this. Audibly the noise floor is much lower than any of the old amps, channel separation is tremendous, along with the damping factor and head room. The power supply to quote Jeri is "solid as the rock of Gibraltar" there is no power supply waveform spiking, voltage reduction or frequency stretching under any test load or frequency. The amp will make full power to 4 hertz and has response past 150,000 hz. The two channels are completely identical wave forms and the dc offset per channel averages 5 milli volts. There is much more to be said technically about this amp and we will be giving more figures later. Headroom and damping factor is thru the roof, we will have exact figure soon, along with slew rate, channel separation, THD and signal to noise ratios, but to put it simply they sound awesome.
  19. linearpower

    New Amps 2 Ohm In The 4 Ohm Taps

    The whole purpose for the two sets of power supply taps in the amps were to raise voltage for high impedance loads or lower voltage for lower impedance loads to allow for the higher current draw. The taps were added for versatility and convenience for the customer that had a previous speaker system that he does not want to replace with new speakers to get the best impedance load. Even though our amps will run 2 ohm stereo or 4 ohm bridged, it is still more advantageous to use a 4 ohm stereo or 8 ohm bridged load due to the higher efficiency of the high voltage taps and the better SQ specs of a higher impedance load. The mathematics basically equal the same power since if voltage is raised and current is reduced by running a higher impedance load in the higher voltage transformer windings, or voltage is reduced and current increased across a lower impedance load in the lower voltage taps. Running a lower impedance load in the high voltage taps can damage the amp or throw it into protection or both on any of our old amps. On the new amps they will reach their preset current limits we have programmed and then shut off. The amp doesn't really care what the impedance load is, it looks at the current asked from it and will not allow it to exceed that level.
  20. linearpower

    New Amps 2 Ohm In The 4 Ohm Taps

    We have never recommended loads lower than we specified for any model amp. The purpose of any mod we have ever done has nothing to do with running lower impedance loads. The protection circuit in the new amps will not allow it to run those improper loads at any major power level. We have the output stage and the power supply protected from over current conditions by two separate circuits that work independantly of each other. Once the amp has reach our predetermined current limits it will shut down. We did not build these amps with the current capability and high power output they have, in order for someone to run a lower impedance load, we did it to make them as dead solid on power output as we could at the recommended impedance loads and to have extreme reserve for the best dynamics and headroom possible, as well as, more reliability and longevity than anything we have ever made before. High voltage amps make as much or more power than high current design and do so more efficiently, with higher sound quality and reliability. Every time the impedance load is cut in half damping factor and headroom is also halved, current draw and distortion is doubled, transistor life is reduced and efficiency is lost and more power is lost as heat. Any electronic or electrical engineer outside car audio will tell you designing for high voltage in ANY electrical circuit is better than a high current situation. We are the only electrical industry that pushes high current design and the reason for it was to cheat in the stereo contests starting in the mid 1980's. there is no electrical advantage. High voltage is used for high power applications all over other electrical industries, it produces high power with smaller cabling, and greater efficiency. This is why your large appliances in your home run on 220 volts instead of 110. This is why car manufacturers have discussed in recent years going to 24 or 48 volt electrical systems in cars. They can decrease cable size saving money on copper wire, reduce weight, improve system efficiency and produce equal or more power than a 12 volt systems can. A 48 volt system can use a cable roughly 1/4 the gauge as 12 volt and make the same power. This idea was used in the 1950's when manufacturers changed from 6 volt to 12 volt electrical systems in automobiles. This same principle works with the internal voltage in a car amplifier. Ohms law states that current multipled by voltage equals power. You can raise current to increase power or raise voltage to do the same. You cannot raise both at high levels due to the limitations of the specs of the transistor. As an engineer you have to choose which path you want to take on the amplifier'sdesign and follow that design. Once you have mixed voltage and current to levels past the SOA (safe operating area) of the device or devices you have now made a time bomb. In a transistor,voltage and current are inversely proportionate, as voltage goes up current must come down to keep the transistor within its SOA and vise versa if current goes up. So what reason is there to increase current by running a lower impedance load to make power and add so many negative effects by doing it; when you can raise voltage and have the same power increases while retaining better sonic capability, efficiency and reliability. The principle of high voltage design is what has made all of our amps last so long and still be in high demand and still bringing premium prices all these many years later. The limits to either design is either you can go no lower in impedance to keep gaining power and your losses keep multiplying with high current, or the limit to high voltage design is the voltage limits of a device. You can make an amp make all the power you want into 4, 8 or even 16 ohms. You just have to build the amp to provide the voltage needed to make the mathematics work.
  21. linearpower

    Sad News

    "Today we are sad to announce the death of one of our own. Chris Underwood was a friend and coworker to many of us for nearly 30 years. He was a member of Stillwater Designs Manufacturing (Kicker) in the mid 1980's when there were only about eight people operating the company. He worked for Richmond Hill Corp (the original Blues) from the late 1980's until 1995 as a key player to the company. Chris had spent several years living and working in the Middle East prior to starting his career in the car audio industry. His last position was here with us at Linear Power, Inc. (Linear Power and Blues Car Audio). Chris was responsible for most of our artwork. He was an avid photography buff since his father had been a professional photographer; and he supplied us with most of our product pictures. He knew people everywhere, and could always find the right people to tackle a task for us. Without him, we could never have gotten Linear Power and Blues Car Audio back off the ground. Chris was that guy who never said he couldn't do something and it would always magically appear a few days later with no fuss. He always had a joke for you. Chris would never do a job that wasn't perfect by his standards, it had to be right before he would say yes to it. He was a personable guy, a good businessman and a great friend with high standards. He was family! He is survived by his wife Connie and a few beloved kitties. Please keep her in your thoughts and prayers. Chris passed away last week, unexpectedly at the age of 64. We love you and already miss you, old friend. God speed to you in your new journey."
  22. linearpower

    Linear Power Bass Vent?

    How is your 4753IQ? Haven't heard anything since we met in the snow storm to give it to you.
  23. linearpower

    Linear Power Bass Vent?

    They were made to use the trunk of the vehicle as the enclosure. They are basically a free air design. Use in a console would not work very well. They are not meant for a box. They provide the air compliance needed to control the speaker like in a box from the air in the cavity between the two drivers. The top slot controls the air movement and creates enough air restriction for the speakers to handle power and volume. The top slot also is responsible for the tuning of the system. They are by no means meant for SPL just low to mid power SQ applications they sound very nice. The original speakers used untreated foam surrounds and can dry rot with time. We can reace the surround material with a treated foam which will give years of use. The cone shouldn't be a problem.
  24. Looks like you should have come. Your ball game may get rained out.
  25. linearpower

    Cablguy184's 1997 Chevy Silverado

    Wish you could make the show, understand that you can't. We are going to have two new cars and possibly a third along with all the regular gang. It's hard to get everyone to one show, would be nice to have the whole group at a show. Especially since it is growing now.
×