modded amps?

[_DjScrew_ 5,000+ posts]

i always see "i want a modded mtx" or "mmats blah blah blah modified" on ebay and stuff. i have asked places and never really got a response on this. All i have heard is you have to know someone at the company, and they will upgrade the powe supply in the amp or something like that. Is this information true?

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[Slaugh 10+ year member]

i remember you could mess with a 1501d and get it to work at 1ohm... wierd thou

 

[zachzchw 5,000+ posts]

Modding an amp usually increases power, by letting the amp play at a lower ohm load. You dont necessarily have to know someone at the company, you can just find someone who knows what they are doing to do it.

 

[_DjScrew_ 5,000+ posts]

Modding an amp usually increases power, by letting the amp play at a lower ohm load. You dont necessarily have to know someone at the company, you can just find someone who knows what they are doing to do it.

yea..... i'm just a big electronics fan, like to mod different things.. and was wondering how this was modified.

 

[bumpin_blazer 5,000+ posts]

Modding amps usually completly voids warranty no matter if it's done by the factory or not. Modding the 1501D as stated let's it play I believe down to 1/2ohm and can take 17v power vs. the normal 14v as well as increases the power that it put's out at all ohm loads I believe. Modding a MMATS D300HC can be done a few differenent ways, all but 1 of the modded d300hc's that I've seen just had the protection circuit taken out and a large capacitor put on the outside of the amp to again allow a lower ohm load. The only d300hc that I've seen different than that was Loyd Lowry's d300hc which still had the full functional protection circuit.

 

[_DjScrew_ 5,000+ posts]

thanks for the info bumpin blazer. anyone else know anything about modding them?

 

[jsloan10 10+ year member]

I found a forum that talks about modding amps and other electronics

http://forums.bit-tech.net/showthread.php?t=87561

Heres another one to check out

http://www.diyaudio.com/forums/showthread/t-54609.html

Heres a quote from that link-

Simple amp mods? Post #7

Hi

You should first get or trace a schematic of the amp before modding so you really know what each components function is.

If you haven't done so already, you should read up on the "objective" causes of NFB amp distortion first to see the complexities involved in what you are trying to do. Simple parts swapping of output devices is usually not possible without redesigning the amp, increasing bias, affecting thermal stability, etc.

Here's a DIY source for the power transistors. Sanken LAPT's are considered the best but you will need to redesign to use them.

http://www.ampslab.com/components_power.htm

The same applies to the SMPS. You can easily cause things to "blow up" in a hurry there.

I am not saying mods can't be done but you really need to know what you are doing, almost to the point of becoming an amp designer yourself! So if you want a challenge here you go:

http://www.dself.dsl.pipex.com/ampins/dipa/dipa.htm#2

I don't agree with everything he says but he provides a good foundation to build on.

A simple mod that D.Self suggests on that page is to increase the size and voltage of the "feedback network blocking cap". He also uses a diode across it but I haven't experimented with that yet.

If your amp uses a cap in the feedback network (most do) it may be too small and will cause significant distortion in the bass. This will be clearly audible "subjectively" Don't skimp here go BG NP or OS-CON since it's only one cap/channel.

I cant recommend messing around with the power supply output caps becuase they are spec'ed along with the toroid to provide the best transient response. If you want to improve the supply of "instantaneous" current to the output stage you could add low esr caps close to the output transistors so as to keep them from greatly affecting the power supply caps. But to do this as others have mentioned may require a 'scope to make sure the power supply or amp doesn't do "funny" things when heavily loaded.

Another thing you may want to try is to make a "composite" cap bank that will provide better line regulation for your amp. This cap must be wired in between the fusing and the power supply.

By "composite" cap I mean a bunch of small identical caps wired in parallel to provide much better discharge current and speed than a larger stiffening cap. To be effective many caps 10 - 40 need to be used depending on the needs of the amp. Because of space constraints amp manufacturers don't leave enough room in the amp for you to do this mod "inside" the amp so you will be forced to make a box that sits under your amp that contains the caps.

If you are still interested I can elaborate further...

 

[_DjScrew_ 5,000+ posts]

thanks a lot man //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[chinny 5,000+ posts]

moddint the amps does indeed void the warranty. not all amps can be modded.

 

[_DjScrew_ 5,000+ posts]

but voiding the warranty is the best part //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[BassAddictJ 5,000+ posts]

i've heard that modding mtx 1501d are easy to mod also....whyso is this one easier than others?

 

[squeak9798 5,000+ posts]

Depends on what type of "mod" you are talking about. Some mods are as simple as removing the protection circuitry (like what is done to the MTX 1501), others entail actually replacing/upgrading critical internal components.

And not all mods will void factory warranty.....back when Linear Power was around (R.I.P.), TIPS was factory authorized to do modifications to the amplifier and still retain 100% manufacturer warranty.

 

[_DjScrew_ 5,000+ posts]

thanks for the info squeak //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif