Does anyone know what the missing values are in the attached table?
I assume the impedance will be 4 ohms or near enough.
Also are there critical differences in the values for T1600 vs T2619?
Need to know as I'm researching replacement woofers for Ditton 44 T1600's. (will create new thread later).
Thanks. Gordon
I assume the impedance will be 4 ohms or near enough.
Also are there critical differences in the values for T1600 vs T2619?
Need to know as I'm researching replacement woofers for Ditton 44 T1600's. (will create new thread later).
Thanks. Gordon
Perfect. Gives Le as well. Don't think I need Vas as I'm not building cabs, but good to compare other drivers.
I measured DCR on mine and they are 3.7 / 3.8 ohm. The site quotes 4 (nominal).
Calculating Z = √(DCR squared + Le squared) gives impedance as ~4 Ohm which makes sense.
However, the site states "Impédance normalisée" as 8 ohm. I think I'm safe to ignore that.
The site is for T1600 and gives the same values which I got (on this forum) for the T2619,
which again makes sense as I don't think there was any great difference between the two.
Thanks Gordon
I measured DCR on mine and they are 3.7 / 3.8 ohm. The site quotes 4 (nominal).
Calculating Z = √(DCR squared + Le squared) gives impedance as ~4 Ohm which makes sense.
However, the site states "Impédance normalisée" as 8 ohm. I think I'm safe to ignore that.
The site is for T1600 and gives the same values which I got (on this forum) for the T2619,
which again makes sense as I don't think there was any great difference between the two.
Thanks Gordon
Data updated for reference.
There appears to be two other variants of the T1600 - vp1 & vp2 with DCR of 7.0 & 7.2 ohm respectively and with different Fs & Qts values!
https://www.petoindominique.fr/php/mysql_thiele_seul.php?hp=951 has all the values you will ever need.
The Ditton 44 cabinet volume is in the region of 60 L
There appears to be two other variants of the T1600 - vp1 & vp2 with DCR of 7.0 & 7.2 ohm respectively and with different Fs & Qts values!
https://www.petoindominique.fr/php/mysql_thiele_seul.php?hp=951 has all the values you will ever need.
The Ditton 44 cabinet volume is in the region of 60 L
| Parameter | Celestion Rola T2619 / T1600 |
| DCR | 4 ohm |
| Impedance | 4 ohm |
| Fs | 22.5 Hz |
| Sensitivity | 91.2 db |
| Power Rating | 80 watts |
| Freq Response | 20 - 2k Hz |
| Le | 0.76 mH |
| Qms | 5.32 |
| Qes | 0.32 |
| Qt | 0.3 |
| Vas | 245 L |
| X max | 4.0 mm |
| Cost (2nd hand) | ~ £50 |
Sorry that I'm a bit late to the party with this info.
My T2619 drivers are in good condition and measured with DATS the Vas is 220 & 226 (litres obviously) with Le values of 1.22 & 1.17
Unfortunately, my T1600 drivers had the wrong size rubber surrounds installed with gobs of who knows what kind of glue in a really poor job. With that in mind the Vas numbers were 356 & 468 (obviously way out) with an Le of 1.18 & 1.3.
I have new, foam unfortunately, surrounds coming and once installed I will remeasure. If interested in those values let me know.
My T2619 drivers are in good condition and measured with DATS the Vas is 220 & 226 (litres obviously) with Le values of 1.22 & 1.17
Unfortunately, my T1600 drivers had the wrong size rubber surrounds installed with gobs of who knows what kind of glue in a really poor job. With that in mind the Vas numbers were 356 & 468 (obviously way out) with an Le of 1.18 & 1.3.
I have new, foam unfortunately, surrounds coming and once installed I will remeasure. If interested in those values let me know.