I sent my pair of GPA Altec 416-8B to Troy Crowe for testing. https://josephcrowe.com/blogs/news/altec-416-8b-in-100l-sealed
As you can see, due to the sealed box size at around 70Hz they probably won't play at much above 80db, if that much, at 11 feet away.
I thought of using a pair of these subs. Rythmik Audio servo subwoofer 12" F12SE Signature Edition
I'm well aware that the 416s were designed to be used in larger and ported cabinets. However, when these were built in 2016 I was following the lead of fellow diyaudio.com member Gary Dahl, who in order to minimize distortion levels put the 416s in those sealed 3 cu ft boxes to limit their low end response, and then extend system response using Acoustic Elegance subs/passive radiators. https://galibierdesign.com/wp-content/uploads/wa-trip_gary-d.jpg
But Gary mentioned here last year that he only uses the subs for home theater. For music, he claims to get ample bass response from room gain due to fortuitous speaker placement. I doubt if I will get that lucky in my room, hence my questions about using the Rythmik subs.
Until Troy Crowe builds the rest of the system-probably using this horn 3D CAD files --- Horn No.1994 -- ES450 Biradial for JBL 2446 2" Throat -I will have no idea how well the Altec midwoofers and the Rythmik subs will sound together.
I guess my main concern is if there will be any big tonality differences between the 416s and these subs if I'd have to cross at around 80Hz. I suppose the only way I could cross lower would be if I was satisfied with moderately high SPLs (~ 86db?) from the Altecs at ~ 70Hz in my 2660 cu ft room, however likely that would be. Equal-loudness contour - Wikipedia
As you can see, due to the sealed box size at around 70Hz they probably won't play at much above 80db, if that much, at 11 feet away.
I thought of using a pair of these subs. Rythmik Audio servo subwoofer 12" F12SE Signature Edition
I'm well aware that the 416s were designed to be used in larger and ported cabinets. However, when these were built in 2016 I was following the lead of fellow diyaudio.com member Gary Dahl, who in order to minimize distortion levels put the 416s in those sealed 3 cu ft boxes to limit their low end response, and then extend system response using Acoustic Elegance subs/passive radiators. https://galibierdesign.com/wp-content/uploads/wa-trip_gary-d.jpg
But Gary mentioned here last year that he only uses the subs for home theater. For music, he claims to get ample bass response from room gain due to fortuitous speaker placement. I doubt if I will get that lucky in my room, hence my questions about using the Rythmik subs.
Until Troy Crowe builds the rest of the system-probably using this horn 3D CAD files --- Horn No.1994 -- ES450 Biradial for JBL 2446 2" Throat -I will have no idea how well the Altec midwoofers and the Rythmik subs will sound together.
I guess my main concern is if there will be any big tonality differences between the 416s and these subs if I'd have to cross at around 80Hz. I suppose the only way I could cross lower would be if I was satisfied with moderately high SPLs (~ 86db?) from the Altecs at ~ 70Hz in my 2660 cu ft room, however likely that would be. Equal-loudness contour - Wikipedia