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Modding the Altec Lansing MX 5021 for dummies!!
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<blockquote data-quote="cranky" data-source="post: 745550" data-attributes="member: 9160"><p>quachhanthanh: this is normal and nothing to worry about. That sound is because we have increased the capacitance, and you will notice it goes away after some time (10-15 mins). If it is a major concern, go back to the original caps, or at least match them for value.</p><p></p><p>The other possibility is that the OPAs need a little better layout and decoupling than is offered by the MX, and may be having some very high frequency oscillation. I recommend using low-noise bipolar amps and not FET-input types in this speaker, and the NE5532 work perfectly fine for this, as the amplifier section will mask the improvements offered by premium opamps.</p></blockquote><p></p>
[QUOTE="cranky, post: 745550, member: 9160"] quachhanthanh: this is normal and nothing to worry about. That sound is because we have increased the capacitance, and you will notice it goes away after some time (10-15 mins). If it is a major concern, go back to the original caps, or at least match them for value. The other possibility is that the OPAs need a little better layout and decoupling than is offered by the MX, and may be having some very high frequency oscillation. I recommend using low-noise bipolar amps and not FET-input types in this speaker, and the NE5532 work perfectly fine for this, as the amplifier section will mask the improvements offered by premium opamps. [/QUOTE]
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Modding the Altec Lansing MX 5021 for dummies!!
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