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Digiflavor Siren GTA Review

Audrey Saccogna
October 24, 2016

Siren GTA by Digiflavor

GeekVape made a huge splash in the vaping market in December 2015, and they have not slowed down a bit. Digiflavor is an offshoot brand for GeekVape and onto the scene on par with its parent company. The new atomizer designs sport unique, innovative and creative features not seen before, yet are friendly enough for new rebuildable users.

Digiflavor calls the new Siren (and Fuji) a GTA, for Genesis Tank Atomizer. The GTA name does give one pause, as genesis style atomizers have always been tanks. The Siren contains an enclosed chimney/chamber, and can be filled with e-juice above the level of the deck. Those design-features actually make it an RTA that happens to use genesis style wicking (with tails that extend down into the bottom of the tank). The style of the Siren and Fuji are intriguing though, and demonstrate thinking “outside the box”.

The Siren GTA is available in two versions. The smaller 22 mm diameter Siren has a stainless steel chamber. In comparison, the larger 25 mm version has a stainless and glass chamber to showcase exotic coil builds. Both GTAs contain a removable airflow reducer, which allows for the choice of a super tight, mouth to lung (MTL) draw or a (very) restricted direct to lung (DTL) vape. I received both sizes for the purpose of this review. Let’s get on with a look at the details.

Digiflavor Siren GTA Specs and Features

Kit Content

  • One Siren GTA
  • One extra glass tank section
  • Two drip tips (one wider bore and one narrow bore)
  • Package of extra post screws and o rings
  • One hex key/screwdriver tool


  • 22 mm (or 25 mm) diameter
  • 43 mm height without drip tip (both)
  • 4 mL capacity for 22 mm GTA (5 mL capacity for 25 mm GTA)
  • Single coil design
  • Removable airflow reducer below coil
  • Two post design
  • PEEK insulators
  • Adjustable bottom airflow ring (4 settings)
  • Top filling design

Notable Remarks

Machining/fit and finish

Both the Digiflavor Siren GTAs are machined well. Threads are smooth and all the parts fit nicely together. I do have a couple of grumbles though. The airflow reducer is a large thumb screw but it is difficult to remove or put back with my fingers because the posts are so close to the edges. I found it easier to use a pair of needle nose pliers, although either fingers or pliers will require several small turns to accomplish the task. Also, the spare Pyrex glass tanks were packed very tightly in the foam insert. I broke the extra one for my 25 mm Siren, which is something I have never done before, when removing it for cleaning. Obviously that has nothing to do with the machining of the atomizer, but rather the design of the packaging. Use more care than I did if you are hoping to have a spare glass.

Build deck


Both the 22 mm and 25 mm Siren GTAs utilize the same design on the build deck. These atomizers are for single coil builds, and have two opposing posts. The posts have a handy notch cut out to wrap your coil leads around, and the leads are secured by top mounted Phillips head screws. Please be aware that the beneath coil air hole is raised rather high so do take care that your coil is mounted high enough not to short on it, but not so high as to short on the top of the chamber.

Wicking the Siren GTA

Digiflavor Siren wicking

I recommend using a 3.5 mm inside diameter (ID) coil in your 25 mm Siren GTA, and a 3 mm ID coil in your 22 mm Siren. Those coil diameters will ensure you have adequate wicking to fill the semicircular wick slots on the deck so your GTA does not flood. Anything smaller will likely allow e-juice to flow up past your wick tails and onto the deck. Please cut your tails long enough to touch the bottom of the atomizer to transport all your e-juice to the coil as the tank becomes low. Following those two tips makes the Digiflavor Siren GTA a very easy atomizer to master, and I do recommend it for beginners to advanced builders.

Airflow and airflow controller

Digiflavor Sirent deck

The airflow on both versions of Siren GTA is adjusted via a bottom airflow control ring (AFC). The ring allows for four possible settings with increasing diameter circular openings. Each setting smartly clicks into place, which is helpful for preventing accidental adjustment when pocketing or placing your GTA into a purse/backpack.

Additionally, each version of the Siren GTA comes with a thumbscrew type of airflow reducer that may be screwed onto threads on the air hole on the deck, below where the coil is placed. Using the reducer screw ensures a very tight mouth to lung (MTL) vape. Even run without the reducer and on the largest opening on the AFC ring, the Siren GTA is a pretty tight, restricted direct-to-lung (DTL) inhale.



The Digiflavor Siren GTA is a simple, mess free atomizer to fill with e-juice. Simply unscrew the top cap and fill with any type of bottle through the large, kidney shaped slots. Filling is a tad slower on this design compared to the typical RTA as e-juice flows down past the center located chamber and is absorbed by the long wick tails. Once full, replace the top cap and the Siren is ready for vaping.


Digiflavor Siren finishes

Mouth-to-lung vapers rejoice! China has heard you and created a budget priced rebuildable tank with you in mind. The Siren GTAs are capable of an extremely tight draw with the airflow reducer in place and the AFC ring adjusted to its smallest opening. Honestly, I think even those vapers seeking the tightest possible airflow on an RTA will be pleased with the Siren.

However, those looking for a looser direct to lung experience will be better served to look at Digiflavor’s Fuji GTA, which is available in both single and dual coil versions. Wide open without the reducer in place, the Siren is still a darn tight direct-to-lung (DTL) inhale.

Both the included drip tips for the Siren GTAs are also designed with mouth to lung vapers in mind. Even the one labeled by Digiflavor as “wide bore” would be considered quite narrow by current definitions. The drip tips are 510 compatible so if you are not pleased with either it is just a simple matter of using another in your collection.

The Digiflavor Siren GTA is a flavor-centric atomizer. Clouds are reasonably sized and will likely be found adequate by those who will enjoy this RTA, but don’t expect to take it to a Cloud Competition.


  • Easy to wick
  • Suitable for beginners to rebuildables
  • A nice atomizer for mouth to lung vapers who often feel overlooked in the budget category
  • Included drip tips are Delrin or Delrin tipped to remain cool
  • Straight forward, mess-free filling
  • Flavor centered design


  • Very tight packaging around replacement glass tanks. You may want to cut the foam around the edges with a hobby knife to safely remove your spare glass
  • Airflow reducer can be difficult to remove or replace
  • Not suitable for those looking for a looser draw
  • Phillips head screws strip easily


I recommend the Digiflavor Siren GTAs to Mouth to Lung (MTL) vapers on a budget (or even if you aren’t). I also feel it is an excellent first rebuildable tank due to the ease in wicking, an area many new builders struggle with. Available in two sizes and colors (silver or black), one is sure to look sweet on your favorite mod. If flavor and tight airflow are your top priorities, one of the Siren GTAs may be just the atomizer you are seeking.

Audrey Saccogna aka "Roxynoodle" is a retired math teacher who enjoys art, music, and remodeling her old farmhouse. While she is devoted to her horse, dog and four parrots, she is also dedicated to helping others discover the miracle of vaping because she kicked a 35 year smoking habit.
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