Digiflavor Siren MTL RTA V4 Review

The team over at Geekvape very kindly sent of a selection of their latest products to come to market including the  Digiflavor Siren MTL RTA V4,   due to summer holidays and busy work and home life, these reviews have been slightly delayed .  But the extra time has given me a bit more testing time.

For those of you who haven’t heard of Digiflavour, and are wondering what the relationship is between Geekvape and Digiflavour.

Digiflavor is a Shenzen based manufacturer who were established back in 2016 by parent company Geekvape, with the moto of “It’s time to make the world better” it wasn’t long before their first Siren MTL tank hit the vape market. Followed shortly in 2017 with the Siren 25 GTA which was a single coil RTA with a massive 5ml tank. About a year later, and with a redesigned and upgraded build deck, was the Siren 2 GTA.  It wasn’t until 2020 when the next incarnation of the Siren arrived, with the Siren 3 GTA, making up part of the DigiflavourZ1 SBS Kit,  with improved screw placement, switching out the slightly awkward side mounted screws, to be replaced too mounted, which made it much easier and less fiddly to build on,   So you can see, that in a way this High quality MTL RTA has been over 4 years in the making, and countless hours of development, testing and feedback. Allowing Digiflavour to create one of the best MTL ranks. Around, with absolutely stunning flavour, whilst giving the user a super simple deck to build on. A great Vaping experience. Taking many of the design questions from the original Siren, keeping the width , and two post GTA style deck.

Introduction 

Digiflavor Siren MTL RTA V4 - an airflow-control expert provides boosting flavor with leakproof bottom airflow system that enables easy coil-building on a single coil GTA design deck. With long or short drip tip and precise airflow control, once again, enjoy marvelous MTL experience at ease.

Parameters

• Size: 22* 51mm
• 1 x  Clapton Ni80 1.2ohm coil
• 1 x Fused Clapton Ni80 1.4ohm coil
• 1 x Braided coil KA1 0.65ohm
• 1 x Fused Clapton SS316L 1.0ohm coil
• Thread: 510

• GTA Deck Design
• Single Coil Design
• Precise Airflow Control
• Bottom Airflow
• Leakproof Design
• Easy Coil-trimming
• Easy Coil-building
• Long/ Short Drip Tip Options

Colours

Black, Gunmetal, Stainless Steel,  Rainbow.

What included in the package 📦 

1x Siren MTL RTA V4
4x Cotton
4x DIY MTL Coils
1x Spare 510 Drip Tip
1x Accessory Kit
2x Spare Slot Screw

Build and Design.

All elements of the design of this version of the Siren, have been designed around delivering the best level of flavour as possible. Coming in at only 28.5mm tall, excluding the extended drip tip.  They have managed to get the coil as close to the drip tip as possible, with what seems like a tiny inner chamber, compacting, and intensifying the vapor, and flavour.

The main thing that gives the Siren v4 its striking, and compact look, is the distinct lack of tank, in the normal sense of the term.

 

The tank it’s self is with in the body of the RTA, with a very narrow viewing window, located towards the base of the device, sitting just above the mirco knarled  grip ring.  Which partially hides the the bottom airflow control ring.  The airflow system has been designed in such a way, to give a smooth even distribution of airflow, whilst maintaining its leakproof design.

The AFC ring, has a small red indicator dot, which is there to give clear guidance as to what level you have the airflow set to.  The AFC is nicely set between two rings of Micro Knarling, which allows you to easily adjust the level of airflow. I must say that the Siren RTA, has the perfect amount of resistance when turning, and adjusting the airflow. Although due to it low level setting, I have to remove the tank off the device, to enable adjustment.

Although the tank only holds 2ml of juice, it seems to last well, due to the reduced coil size and wattage.

I really did think that the lack of glass tank, would bother me, and I would know how much juice I had in the tank, and to be honest, it didn’t bother me at all, and the thin viewing window set at the base of the tank section, gave ample visuals as to when the tank needed filling. As you can see the juice level as it begins to run out, and you can tell, how the Siren performed, as to Cotton began to dry out.

Filling the tank.

To fill the tank, the top section of the of the Siren simple unscrews, it’s worth pointing out, that the threading on all parts of the RTA are so well machined, and silky smooth, and always seem to start threading straight away, without the need to back thread out try and line up,  once you have unscrewed the top cap, you have access to the two kidney shaped fill ports, which sit in a nicely recessed top section, which is perfectly laid out, and has enough of a lip, to catch any juice overflow, which you could do with on more tanks to prevent juice flowing down the side of your tank.

Drip Tips.

The Siren comes with a choice of two stand out drip tips. The preinstalled drip tip measures an amazing 23mm, which virtually doubles the of the Tank,  I have read quite a few comments on social and forums, with people taking real offence by the drip tip design, and that they are both ‘complete Monstrosity’. To be honest I really like the taller drip tip, and with a bore of around 3mm, it delivers a nice smooth tight draw, and in keeping with the MTL design, and adds to the experience. They are both 510 drip tips, so if you really don’t like them, you can swap them out,  both of the drip tips, are held snug by a set of double o-rings.

Base section & 510 Connection.

As with most RTA’s of the day, the Siren comes with a well finished gold plated 510 connector, surrounded by the normal peak insulation ring, and would be suitable to install on a hybrid mod, if you wanted to, I didn’t personally, and wouldn’t have thought you would pair up a tiny MTL RTA with a hybrid mod. But each to their own,

Airflow Design.

From initial inspection, and adjustment, I couldn’t really see how the airflow holes worked.  As the AFC ring itself only seemed to have a grading graphic, running over the recessed red dot. To show which way to adjust, but no visual airslots. After a bit more investigation, and removal of knarled  AFC ring.  

You can see a row of hidden air holes. Each the same size, all lined up under the grading graphics. The recess cut out of the actual ring, is what restricts and controls the airflow, from a medium loose MTL draw, down to a completely closed off tight as can be.

The Sirens V4 Build Deck.

The GTA Style build desk, is what makes this little tank the real star of the show. I tend to find that most MTL tanks have such a tiny deck, and tend to be quite challenging to build on, and even harder to wick successfully. 

The GTA style deck on the Siren V4 is a real pleasure to build on, and due to it being raised up slightly, allows you to easily poke the wicks through the wick ports, which each have three holes machined into the bottom, to allow the wicks to be feed, without getting choked by going down directly into the juice well, sitting just above, the 5mm juice well. Allowing you to cut the wicks quite short to just place them neatly into the wick ports.

The airflow is neatly directed down and under the deck, to bring it up, directly under the coil through 7 small air holes set in a circle .

The coils are held in place by two slotted post screws, which are also gold plated, which did make them the weak point of the build deck, as they are quite fragile, and even after just a couple of builds, the screw tops had become quite sharpe. As they started to strip.

Build.

After loosening off the gold plated screws, to allow the coil legs to be feed under the clamps, and once aligned correctly, you can then carefully tighten down the screws, whilst holding the coil in place with the coiling rod, or screw driver.

Then trim the excess legs off, ensuring to not leave straggles which may short out the coil, on the chimney.

Then slowly heat up the coils to remove any hot spots, strumming the coil, with the flat head screw driver.

Once the coil has cooled down, you can carefully thread the supplied shoe lace cotton through the coil, and then trimmed off, just inline with the edge of the deck. Which allowed just the right amount of cotton to reach down, to sit just at the bottom of the juice ports.  It’s worth giving the cotton a little comb out and retrim, to ensure they wick freely 

Coils & cotton

The kit generous includes four MTL style coils, 

• 1 x  Clapton Ni80 1.2ohm coil
• 1 x Fused Clapton Ni80 1.4ohm coil
• 1 x Braided coil KA1 0.65ohm
• 1 x Fused Clapton SS316L 1.0ohm coil

I found the smaller thinner coils where fairly hard to build and set, as I found that as soon as you tried to wick them they tended to pull out of place, so found the thicker fused claptons would keep their shape for longer. Although I found the braided coils produced great flavour, but destroyed them when I pulled the old cotton out, so sort of gave up on them.

The latest coil I have installed, was just a standard 3mm inside diameter 28g Kanthal coil. Which I really liked the ease of build and wick, and great flavour. And stayed firmly in place when de-wicking.

Everyday Performance .

I must admit in not an everyday MTL vapor. And tend to be using my OXVA Velocity with the air flow about half open, but do like the occasional tighter MTL draw, especially with custard blends as you just get more flavour. The Digiflavour Siren MTL RTA is one of the best MTL tanks that I have used in a while. With just the right amount of restriction. As I really don’t enjoy an MTL vape if it is too loose, and for some reason it just makes me cough. Weird I know. But with the Siren MTL a 1/4 open, it was spot on. With just the right amount of draw, and a super intense flavour coming up through the 3mm straw like drip tip. 

Positives 👍

• Small and compact design
• High build quality with a real premium feel
• Amazing Flavour Reproduction
• Best MTL Airflow in class
• No issues with leakage.

Negatives 👎

• No tank to see juice levels
• Low juice volume
• Can’t adjust airflow whilst on mod.
• Included coils hard to install, to soft.

Have really enjoyed using the Digiflavour Siren MTL, once I had put my own coils in, as the ones included in the kit, are just too flexible, and ended up reinstalling a new coil, after bending it out of shape when I pulled the cotton out.

Head over to the Geekvape And Digiflavour store and try one for your self