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In the Forum: Horn-Loaded Speakers
In the Thread: Deep End DIY - Australian take one Macondo.
Post Subject: YepPosted by anthony on: 10/24/2025
 Romy the Cat wrote:


Anthony,

I have much to share about my impressions and feelings regarding your project, but I’ll save that conversation for another time. For now, I’d like to address one specific technical point. I wrote about it quite some time ago, but given the volume of my earlier posts, it’s entirely possible that message was lost in translation.

Apologies for the mind dump this morning...there is a lot to take in at once.  You will notice in later posts that I adjusted the filters to suit each preamplifier.

I was astonished at how different the sound was when switching from 12 ohm to 78 ohm output impedance preamplifiers.  The trial preamplifier is a brand new release in pre-production (hence no published specs) based on an earlier model in the same stable which has 12ohm output impedance...exactly the same as my 10Y preamp.  Had I realised how much work it was going to create I may not have trialled it, but I am very glad I did.

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