Phil Starr Posted December 15, 2010 Share Posted December 15, 2010 Anyone got any idea why the Yamaha cabs for this speaker are so big? WinIsd comes up with 175l and shows a pretty good response with 100l. My other modeller gives 140-156l for classic alignments. The Speaker is marked Eminence Sigma and eminence have this data [url="http://eminence.com/proaudio_speaker_detail.asp?web_detail_link=SIGMAPRO18A-2&speaker_size=18&SUB_CAT_ID=1"]http://eminence.com/proaudio_speaker_detai...mp;SUB_CAT_ID=1[/url] . Winisd has slightly different data (Vas slightly smaller). Are Yamaha trying to squeeze deeper bass out of this with an oversized cab or are they fitting a different version of this speaker? It is a fairly old cab. If anyone has any information I'd be very grateful Quote Link to comment Share on other sites More sharing options...
Bill Fitzmaurice Posted December 15, 2010 Share Posted December 15, 2010 Perhaps the cab design pre-dates the woofer, and it was originally loaded with a driver that need a larger box. That, or Yamaha wanted to go lower than what 175L allows. IMO an eighteen loaded cab with a 50Hz f3 makes little sense. Quote Link to comment Share on other sites More sharing options...
Phil Starr Posted December 15, 2010 Author Share Posted December 15, 2010 [quote name='Bill Fitzmaurice' post='1059750' date='Dec 15 2010, 05:14 PM']Perhaps the cab design pre-dates the woofer, and it was originally loaded with a driver that need a larger box. That, or Yamaha wanted to go lower than what 175L allows. IMO an eighteen loaded cab with a 50Hz f3 makes little sense.[/quote] I don't think it's the wrong speaker, though because I bought it second hand, I can't be sure. The original would be Eminence (it say's so on the badge) and they don't advertise a whole lot of 18's. I agree with you about the speaker making not much sense as a piece of design. It just seems lazy to me, but I might be missing something.With a magnet giving Qts of 0.29 there's leeway for lowering the response or using a longer voice coil as this thing is still excursion limited. Although the set up (s118's with s112V's) sounds pretty good it does seem like someone has said "we'll give them a big speaker in a big box" rather than starting with a design spec. Quote Link to comment Share on other sites More sharing options...
Bill Fitzmaurice Posted December 15, 2010 Share Posted December 15, 2010 [quote name='Phil Starr' post='1059843' date='Dec 15 2010, 01:35 PM']I agree with you about the speaker making not much sense as a piece of design. It just seems lazy to me, but I might be missing something.With a magnet giving Qts of 0.29 there's leeway for lowering the response or using a longer voice coil as this thing is still excursion limited.[/quote] It probably boils down to money. You can get a lot more out of an eighteen than the Sigma will give, but the cost would put it beyond the price point that Yamaha can command. Quote Link to comment Share on other sites More sharing options...
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