32 replies to this topic

[Linear Power]

Several improvements have been made to an already tried and proven great design to make it even better.

Attached File(s)

•  new heat sink view 1.JPG (388.54K)
  Number of downloads: 5
•  new heat sink view 2.JPG (400.53K)
  Number of downloads: 4

Edited by Cablguy184, 19 January 2012 - 12:47 AM.

[Cablguy184]

[Audio-Concepts]

I love it! I wish I had the income!

[Linear Power]

We have thickened the top plate by double the thickness, which improves the flow of heat from the sides to the middle. We have also re-located the upper endplate screw mounting boss which on the old heat sink created an interference with the flow between the sides and top. The fin height was also increased by 1/8 of an inch which gives 1/4 inch more surface area per fin. Then we angled the transistor mounting surface to create more thermal mass to draw heat from the transistors at a higher rate than the original. Finally, we thickened the mounting feet to help reduce bending and breaking if they are hit on the corners, we also extended the foot width by 1/16th of an inch to allow us to move the mounting hole a little further from the side fins, to keep them from being scratched by the screwdriver when mounting the amp.

[6APPEAL]

It's all in the details!

[reaper68]

Reminds me of crocodile Dundee, now thats a heat sink Nice, let me know if you're doing any preorders or anything. I would love to run all LP stuff in my gto

[Rick]

They sure do look more heavy-duty than the original design. I think Ray is "actually" going for the "bullet-proof" design and he nailed it. Next test............ 9mm, lol.

[smoothfidelity]

Rick, on 23 January 2012 - 07:51 PM, said:

They sure do look more heavy-duty than the original design. I think Ray is "actually" going for the "bullet-proof" design and he nailed it. Next test............ 9mm, lol.

Some people actually like to use their LP amps for what they were built for; to be installed in a vehicle to be played and enjoyed.

[Thunder39208]

To add to smoothfidelity's statement: "for years and years....."

Rick:"fyi", Ray prefers a "40"

[Cablguy184]

reaper68, on 23 January 2012 - 03:42 PM, said:

Reminds me of crocodile Dundee, now thats a heat sink Nice, let me know if you're doing any preorders or anything. I would love to run all LP stuff in my gto

We want you to run all Linear Power in your GTO also ...

Rick, on 23 January 2012 - 07:51 PM, said:

I think Ray is "actually" going for the "bullet-proof" design and he nailed it.

Looks that way ... But that amp will run ALOT cooler than most amps made today

[Cablguy184]

Old heatsink design ...



Somebody say something about colors ??? We have you covered !!!

[Cablguy184]

Cooling system ...

[Cablguy184]

[Cablguy184]

Thought I'd save the "Words of Wisdom" over here for future reference ...

New Line of Linear Power Amps Available this Spring


[indent]The new line of Linear Power amps will be available this spring. They are still designed and built in the USA, and are of even better SQ and quality than our old units. We will be introducing three two channel amps in the beginning, the LP2075 (75x2RMS), LP2150(150x2RMS), and LP2250(250x2RMS). They will be rated at 12.8 volts at 100 hz, not the 14.4 volts at 1Khz rating the other SQ companies are using to get higher power figures, even though we will give power figures at those rating for comparison. We will be supplying more data on the units shortly.

Dimensions on the new amp line:

H = all amps will be 2.375"
W = all amps will be 9.25" (main body) 10.4" counting mounting feet
L = LP2075 8", LP2150 9.25", LP2250 14.5"[/indent]
Re: New Line of Linear Power Amps Available this Spring


[indent]We will be at Spring Break Nationals in a booth with demo vehicles to show, and product that can be held and looked at. We have also re-done the heat sink design to improve an already good design. These things are going to look great inside and out and perform like nothing on the market. The 2.2HV from our line was a well respected SQ amp but the LP2150 blows it away in every instance. I will post pics in a short while, I am working with one hand and typing with the other at the moment, it may be a hour or so but I will get pics up of the prototype and the new heat sink design. Until then anyone wanting to see them can go to Linear Power Inc. - For The Love Of Music for info and a pic, or www.caraudio-forum.com where we have even more internal and external pics and information from people that have got to test the prototypes.[/indent]

[Cablguy184]

Here is more ...
[indent]Everything in these amps was done with a purpose for SQ and reliability. The amps share NOTHING between the two channels, they source their own ground from one common point in the power supply and are not combined anywhere in the signal chain. Every signal path in the amp is shrouded by a ground trace on each side of the signal line to create a 360 degree noise shield around the signal, the board is 3 OZ copper, the big big class D amps are proud of saying they use 2 OZ copper. We use 3 OZ to minimize any high current losses, increase efficiency, and to reduce heat build up in the board.

We use twin Burr Brown op-amps and neither channel is shared between the two. Every electrolytic cap in the signal path and some in the power supply use WIMA by-pass caps as a SQ improvement. Tru Technology gets several hindred dollars jsut to add these caps as one of their stage upgrade to the amps.

Even the gain pot is a 10% part where the standard for the industry is a 20% gain pot. The gain pot is the nearest point that the two signal paths come to each other.

These amps can be ordered with a DIP header and a DIP pack to set the voltage input exactly to the headunit (2,4,5 7,8 volts in) instead of using a gain control. There will be a plug in crossover card availiable and factory installed when ordering for the people that want a crossover. For those who don't the siganl path will be un-effected by the crossover since it will not be plugged in. The crossover card will also utilize a gain control or DIP packs to exactly set the crossover points and stop any chance of signal difference between the two channels. Ther is plenty more I can go over about these amps. We will post a pic of the old heat sink in a little bit and I will go over those improvements we added to the new heat sink. These amps can't be touched by anything we have done in the past and will outperform anything on the market that is true SQ.

The power filtering is handled in three stages to decrease noise to a bare minimum, the power is filtered directly at the bridge rectifiers, then again when leaving the power supply in the center of the board, and again directly at the output devices to keep the power to them as squeaky clean as possible and to storing energy directly at the output devices. All caps are high grade audio caps, that are extremely low ESR and high temp caps. 6 different protection systems protect the amp, and are non-interactiive with the signal path. This is just a few of the advantages to this amp.

Power supply efficiency is in the plus 80 percent range and over all efficiency is in the low to mid 70 percent range. The LP2150 will make rated power of 150 x 2 with 30 amps of current. An example of the 2.2HV versus the first prototype of the LP2150, the 2.2HV had an internal voltage of 97 volts and the LP2150 had an internal voltage of 84 volts, yet the power output was almost identical except at low frequency and the 2150 beat the 2.2HV, the final version of the 2150 makes tons more power than a 2.2HV and also sounds tons better, and the 2.2HV was known as one of the great SQ amps.

We also use the highest grade of audio devices currently offered by On semi (Motorola) these devices only run at 30 percent of their capability, they are also the largest plastic cased audio devices on the market (they have the EXACT electrical specs as the meatl cased TO-3 transistor, these are TO-3P devices, they are jsut derated by 25 watts of heat dissaparion from the TO-3 metal cased parts). we used these to dissapate heat effectively and quickly into the heat sink. The power supply only runs at around 27 percent of its capability at rated power. This terminates in well over 3 dB of headroom, and the damping factor is rated at the speaker terminals at 20 Hzs at greater than 375, not taken from an point on the circuit board to get a higher rating or at a higher frequency to make the figure bigger.[/indent]

[Cablguy184]

[indent]They will not be cheap, but compared to the other SQ brands such as Zapco, Audison, Focal, Tru Technology, Mosconi and the such we come in several hundred dollars cheaper. We do not have the exact prices yet, but the really near ballpark is going to be

LP2075 (75x2 RMS @ 12.8 at 100 HZ or less) 900-1000.00
LP2150 (150x2 RMS same conditions 1200-1300.00
LP2250 (250x2 RMS same conditions 1800-1900.00

One thing you have to remember is that our pwoer ratings are at 12.8 at 100 HZ or less, all the brands I listed are at 14.4 volts at 1Khz. So our power output is SIGNIFICANTLY higher if we rate them like the other brands at 14.4.

Example the LP2150 is rated for 150x2 at 12.8, at 14.4 it makes a minimum of 195 watts a channel RMS. Comparing power versus price the Zapco 150x2 is 1499.00 retail, and the BASE True Technology 110x2 (they don't make a 150x2) is 1599.00 and if you want the SQ stage 4 upgrades (almost all the parts that you get with our STANDARD production unit) the price jumps to 2699.00 for the Tru Technology piece. We are going to be well hated by these companies when word gets out about a really TRUE SQ line of amps we have.[/indent]

I liked this one ... lol

[Audio-Concepts]

I love reading how truely amazing these amps will be! I just wanna spread the news on every forum I am on!

[Steve Carnahan]

Bullet proof? No. Between Ray, Jeri, and myself we are pretty certain we have bullets that will go through at least two of the three dimensions. Either .223 or .308 should do it. Jeri has a Ruger Black Hawk in .44 Mag that would make a big dent.

As for electrically bullet proof we are close. We often have to reel Jeri in when it comes to protection or over building. He says something isn't enough and after discussing it we find out he means "if they bridge it into a 1 ohm load in the 4 ohm taps and the battery voltage sags it might have an issue". So yes we are pretty close to bullet proof. Our power supply design will stop stop most failures. Even ones that are intentional.

The ratings are what the amp can actually produce. They'll do those power ratings for long periods of time without failure or sag. I'm drawing up plans now for an oil cooled load bank so we can safely test amps for more than a few minutes. Right now we have to hang the loads so they don't catch anything on fire or burn anyone.

[Linear Power]

When we burn in the amps and do a thermal full power test, the "loads" which are precision lab spec 1% non-inductive 250 watt load resistors that are aluminum heat sinked reach temperatures of over 500 degree F. I have a black rectangle on my anti-static matt and a bubbled brown rectangle on the gray formica table top on my work bench from the load resistors. The amps produce full power turned upside down for over 1 hour and 20 minutes to complete the test. This is the worst way to treat cooling a heat sink.

In actual usage the amps will produce a good bit of heat for their size when running at full power for long periods, but the thermal circuit will shut the amp down before any damage can occur. Playing music at full power (WFO) they will typically play (in the old heat sink design!!) from 2.5 to 7.5 hours with out shutting down, to shut them down on the lower time side you have to play something like AC/DC for all its worth, and your ears can't take it for that long. We literally turned the head unit up all the way and walked away with Poison, Pink Floyd, and AC/DC playing back to back at WFO and came back to check it from time to time, this provided a more real world test than testing it on the bench with a load resistor.

The dynamic power of the 2150 into a 3 ohm load (our 6.5 and 8 inch component sets average impedance curve) at 14.4 battery volts is over 500 watts per channel. Peak power per channel into a 4 ohm load resistor with less than 1.0% THD is 400 watts per channel (basic CEA rating standard)

Edited by Linear Power, 25 January 2012 - 02:08 AM.

[Linear Power]

reaper68, on 23 January 2012 - 03:42 PM, said:

Reminds me of crocodile Dundee, now thats a heat sink Nice, let me know if you're doing any preorders or anything. I would love to run all LP stuff in my gto

We are taking pre-orders!