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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Brick On Transformer McIntosh MC402 posted by Dr.Phil on July 16, 2010 at 09:48:06:
Many power amps have large and heavy power transformers mounted on thin metal plates. Even if the plate is tooling stock and not stamped sheet metal, it still flexes like a trampoline. The weight of the power transformer brings the resonant frequency down to where it can interfere with the bass response of the amp.
Adding weight (the brick) further lowers the resonant frequency. This may or may not help in general, although you report a benefit in your setup. A better and more complete solution is to support the mass of the transformer directly. It would be tricky to do this with your MC-402, as the transformer appears to be fixed to the top of the chassis. However, it might be practicable to put some metal posts between the top and bottom chassis plates, and place firm support directly beneath the posts.
I've used this idea on a Sanders-designed InnerSound ESL-300 and Gilmore Raptor monoblocks. Both of these have big and heavy toroidal power transformers fixed to the bottom chassis plates. Providing firm support to the transformers improved the bass fidelity in both cases.
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Follow Ups
- Sumo wrestler on a trampoline... - Al Sekela 11:25:04 07/16/10 (4)
- transformers, - unclestu 17:58:53 07/16/10 (1)
- Agree, but beware of shipping stresses. - Al Sekela 10:00:47 07/17/10 (0)
- RE: Sumo wrestler on a trampoline... - Dr.Phil 14:03:38 07/16/10 (1)
- Sand in zip-lock bags - Al Sekela 09:58:34 07/17/10 (0)
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