arficus Posted September 6, 2020 Share Posted September 6, 2020 Any sonic differences between older and current production. Considering possibility of using one of each. Older one has push terminals (vs solder tabs) and judging from packaging is likely circa 1980s? I have seen posts showing some differences in frequency response between different iterations of these, but this was up past 6khz, and I'll likely be crossing around 4khz. So, wondering if they'll sound different otherwise... Quote Link to comment Share on other sites More sharing options...
Panelhead Posted September 7, 2020 Share Posted September 7, 2020 Alnico demagnetizes over time. 35 - 40 years Is plenty for this to happen.. The new one should play louder. How much magnet strength is lost depends on use. Plus storage temperature. But all the really old Lowthers I owned were weaker. People say the alnico K77 drivers lose top end and output. Like down to 8 - 10K Hz. Would think the K55 does the same. Quote Link to comment Share on other sites More sharing options...
mustang_flht Posted September 7, 2020 Share Posted September 7, 2020 Currently neodymium magnets are an excellent compromise for modern horn drivers. Many big brands use this technology : Faital pro, B&C, RCF, BMS, Radian, Celestion, ... Quote Link to comment Share on other sites More sharing options...
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