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Martin Poulin
Below is a DATS measurement of the Scanspeak 26W4867T00, aluminum cone version.
The manufacturer uses a large signal for specifications, while DATS use a small signal. Hence, a discrepancy.
QES is higher than published. No surprise here.
![scan speak 26w4867t00](https://static.wixstatic.com/media/3f5ca2_d637431baf2b42d0b155018bd8572b54~mv2_d_2272_1704_s_2.jpg/v1/fill/w_600,h_450,al_c,q_80,usm_0.66_1.00_0.01,enc_avif,quality_auto/3f5ca2_d637431baf2b42d0b155018bd8572b54~mv2_d_2272_1704_s_2.jpg)
![](https://static.wixstatic.com/media/3f5ca2_851e48bee17f40838081b16aede6d483~mv2.png/v1/fill/w_921,h_450,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/3f5ca2_851e48bee17f40838081b16aede6d483~mv2.png)
Below is a DATS measurement of the Scanspeak 32W4878T00 with a paper sandwich cone.
Manufacturer uses a large signal for specifications, while DATS uses a small signal. Hence, a discrepancy.
QES is higher than published. No surprise here.
![scan speak 32w4878t00](https://static.wixstatic.com/media/3f5ca2_88176ab1fb254ceea94ceded12b3e92f~mv2_d_2272_1704_s_2.jpg/v1/fill/w_600,h_450,al_c,q_80,usm_0.66_1.00_0.01,enc_avif,quality_auto/3f5ca2_88176ab1fb254ceea94ceded12b3e92f~mv2_d_2272_1704_s_2.jpg)
![](https://static.wixstatic.com/media/3f5ca2_8d757236e4ea440b80facd572708d0d9~mv2.png/v1/fill/w_893,h_450,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/3f5ca2_8d757236e4ea440b80facd572708d0d9~mv2.png)
![ftr-4080F.JPG](https://static.wixstatic.com/media/3f5ca2_1c53a246adb84b4bb5bd1a490503f072~mv2.jpg/v1/fill/w_599,h_290,al_c,q_80,usm_0.66_1.00_0.01,enc_avif,quality_auto/ftr-4080F_JPG.jpg)
Below is a DATS measurement of the Celestion FTR-4080F
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![download.jpg](https://static.wixstatic.com/media/3f5ca2_4d5fdd7f648f48beb92aa523118124c0~mv2.jpg/v1/fill/w_292,h_292,al_c,lg_1,q_80,enc_avif,quality_auto/download.jpg)
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