Raal Requisite CA-1a - Official Thread

This is the place to discuss all things to do with the Raal Requisite CA-1a.

We were able to get a review unit up for some measurements and evaluation.

Raal Requisite CA-1a measurements done on the GRAS 43AG with RA0402 coupler and KB5000 pinna.

Source used for measurements:

  • Matrix X Sabre Pro
  • Vioelectric HPA V550

Open pads

Sealed pads

When I first heard these it was as a prototype at CanJam SoCal 2021. I don’t think they had the pads quite worked out at the time because the treble was downright insane, and many of us who heard it there remarked similarly. The next version I heard at a different show in 2022 had been dramatically improved and was far more balanced. In both cases it was being run from one of the Raal amps.

I feel that the final result may end up being somewhere in between, as these do still have a bit of that bite and lower treble shrillness, but nowhere near as intense as the original prototype many of us heard in 2021. The bass is great though - especially with the sealed pads. Tastefully elevated towards the sub-bass, giving a good sense of thump.

These have a kind of shifted ear gain region to be more lower treble focused than upper midrange focused. One way to think of this would be like an HD 800 S, just even more shifted for the ear gain towards the lower treble.

So, for me, without EQ, the lower treble peaks make it a bit difficult to get into. With EQ, however, the Raal Requisite CA-1a truly shines. This is one where it’s worth it to dive in and make those adjustments. Even if you’re in the anti-EQ gang, I promise you it’s worth it with this one, as the subjective qualities… the intangibles… they’re excellent here.

EQ Profile

For all of the usual audiophile traits that we might think of as ‘a good thing’, the CA-1a is solid, but in particular this headphone exhibits a really good sense of what audiophiles often refer to as ‘speed’. People debate where this quality comes from, as it hasn’t been correlated with any existing metrics (just leave it at that for the moment, and know that it’s most likely not a CSD thing either). But for those who are wondering what the experience of that quality is, this is a great example.

Additionally, there’s almost a kind of tube-like character to the presentation. This could be due to the slightly elevated third harmonic in lower registers that would be tokened by fundamental tones. But it could also be within the masking window and inaudible in practice, so it’s hard to say if that’s what causes it.

Regardless, I’ll leave it at this for the moment. To me its as if I’m listening to music after having three cups of coffee… This thing is intense in a good way.

Non-sound stuff:

  • Slightly odd fit at first, but reasonably comfortable after you get used to it.
  • Build feels sturdy and solid for the cups, but also feels like it was made in a garage.
  • Pads are just a piece of foam… that might be a bit weird for some.
  • Raal TI-1B allows this to be run from more traditional amplifiers/sources! I will be comparing this on a variety of high end sources before doing a full review.

Personal Ranking: Tier One - but needs EQ.


Did you measure after EQ?

The sealed/full pad does lift the bass but you also lose the insane clarity, like a Suede pad on a ZMF, it dampens it all a bit much.

RAAL recently sent me another pad, its a sealed/full pad bit a different foam, finer foam closer to the coffee bean pads. It adds bass but doesn’t dip mids and lose as much as the stock full pads. Happy medium.


Very cool review, thanks!

We welcome the use of EQ to either chase the correct response, or one’s own preferences/taste!

It is very hard to get the other qualities in sound, so the point was not to sacrifice those to get the most accurate frequency response.

In this day and age when EQ is so easily implemented for free, we encourage users to do it, getting a fantastic performance, IMHO exceeding the current TOTL lineup.

I could go on forever about inner workings, but in short, hard work has already been done and hard choices have already being made in CA-1a to the benefit of The Sound. One of the consequences is that they take EQ incredibly well, because there are no problems lurking in the background.

My message to all is to feel free to use a bit of an EQ, as when FR issues are solver acoustically inside the skull-pad-headphone chamber, much more is lost.


The cups are molded very tough polycarbonate with glass fiber.
You can grab the cups and twist them, bending the metal prongs of the headspring to fit the tow-in/out angle to your head. Nothing will break.
Naked foam is there to let the sound escape the ear-chamber as fast as possible. Ribbon driver does not need sealing to create bass, so lots and lots of leakage was the goal. That allows for great dynamics and doesn’t pressurize the eardrums.

We are trying to get the best connection of ears and ribbon drivers to open space, not seal them. Makes the sound more natural for several reasons in our hearing mechanism. So, naked, open cell foam it is, sacrificing the appeal to it’s majesty The Sound.

Plus, they are washable (pressing in a water bath with a bit of dishwasher, do not twist or pull).


I must add about the EQ,

I’ve tried a lot to tweak the EQ, but if I follow the measurements, it always ends up badly.

The presence region gets too shouty, or I get weird, totally un-musical (hever happens in real life) character of sounds, like it’s some really bad recording.

To me personally, EQing to follow the target curve, never-ever brought any benefits in musical presentation. Things just became unnatural to me.

I’ve had much better luck with some other headphones, but they were all nicely sealed and sounded more crowded and more congested in midrange from the get-go.

Seems to me that since the measurements are steady-state, meaning averaged after all the resonances and reflections settled after a while, do not truly represent what we hear.

Music lives, the tones are changing at a faster pace than measurement would want, so there is a lot of direct sound that we hear before everything settles to a measured curve.

So, I end up with just a few touch-ups, and only with amps with tone balance tilted upwards. I do it only as much as it brings something to the table, that’s the important criteria.

Do not strictly follow measured curves. Move in that direction, of course, but only add as much as it benefits the musical presentation.

My recommendation fro CA-1a with “coffee-bean” pads is just -2dB at 1.2k and -5dB at 5k, and only on bright sounding, punchy amps.

The level of effortlessness they have, doesn’t really make things better with EQing more than that, again, to me, personally.


Yes, and I would expect it wouldn’t sound great for most people as well. This is my main issue with the way the target is represented - I don’t think 1/2 smoothing is sufficient to get the required nuances of an individual HRTF, and so if the target is perfectly matched by the FR it’ll end up sounding a bit weird. And I know Sean disagrees with this point, but I think we’d have a better understanding of what to shoot for if we got a fine-grained or ‘high res’ version of the target.

Still, I think doing it by ear is the best way, because you want the fine-grained result that’s ideal for an individual.


Just posting our video review here:

I’ll be doing another video on this topic - or related to it - soon.


I have not posted in a long while, so I am sharing here some impressions of the Raal CA-1a.

I’ve owned the CA for a couple of months now and I find them to be the perfect complement to the SR-1a. However, they need not be considered only as a partner to the SR-1a. And they need not be considered as an overly complicated or expensive headphone to amplify. They are affordable flagship level all on their own.

It is no surprise or secret that one of the perceived inadequacies of the SR-1a, (without EQ, and on some amplification) is the bass. Depending also on how wide one opens the baffles, the bass from the SR can be “heard but not felt” in comparison to other circumaural headphones. While the bass goes deep and is textured and accurate, I agree it can lack some of the visceral qualities for many genre of music. There are, of course, qualitative differences to this based on amplification, and EQ can solve some of this. Those that own Raal’s VM1-a tube amplifier insist it becomes a non-issue altogether, even without EQ, but I have not had the privilege yet of hearing this for myself. Also, with the old adapter box, some expensive speaker amplifiers have been noted to change bass response. And now there is the new TI-1b box that may do the same thing with headphone amplifiers of appropriate specifications. For me, EQ does the trick when I feel I need more bass with the SR-1a.

Having said that, the CA-1a do not have a bass issue! And in this respect, they are like two headphones in one. This is due to the very different character the two included pad sets create. The partially open pads bring the speed and detail of the SR to play, but add bass and a hauntingly rich vocal range. The fully enclosed pads bring bass that rivals the best headphones I have owned, along with a proportionally more intimate position to the vocals. The CA-1a have deep bass extension like a Susvara, and slam like a Utopia. All the while retaining the speed, astonishing detail, and attack unique to ribbon drivers. This is not hyperbole, just an honest opinion. Swapping the two pads in this case gives a more important change than pad rolling, for example, with a ZMF headphone.

Because I also own the SR, I tend to keep the solid pads on my CA. Although I’d suggest the sound is less “reference”, the more exhilarating bass provides a bigger contrast to the SR. I use them for different genre. If I did not have the SR, I suspect I’d gravitate toward the vented pads for what I perceive a slightly more open sounding presentation and a bit less bloom in the mid-bass.

The SR, for me, is still the best “on head” monitor for solo piano, chamber jazz, and large scale orchestral music that I have heard. I repeat, “that I have heard”. Although I’ve had many different ways to amplify them, I currently use the modest Jotunheim R while a VM1-a is being built with my name on it. I almost always add EQ or convolution filter to the SR (and to be honest, out of the JotR, it is necessary as I do not care for the baffle compensation of the JotR).

But outside of those limited genre, I almost always listen on the CA now. It is especially engaging with any music with important pedal tones or dynamic bass. But, it’s not that simple. The vocal range is incredibly seductive. It’s unique to any other headphone I’ve listened to, I cannot think of a better word for it! There is body and richness to voices, but with a halo of detail in harmonics and partials. It’s electrifying.

I laughed in agreement when @Resolve wrote “To me its as if I’m listening to music after having three cups of coffee… This thing is intense in a good way.” So true, the CA are indeed intense. They are not for passive listening IMO, unless at very low volume. The speed and dynamics just distract from anything besides the music itself.

Until recently, I added no EQ to the CA, and I am of the opinion they do not need it. But I have been listening with the two adjustments suggestions from @Aleksandar_R and I apply it sometimes when I want to temper some of the sizzle. This is often after I’ve been listening to a darker headphone and switch over to the CA. Without EQ, the CA do have a couple of elbows on paper, but they are not in areas that bother me. @Resolve ’s EQ profile also evens out the response, but for my own HRTF also takes away some sparkle. Others might find it perfect. Once my brain has adjusted to the musical space the CA create, I find them to be one of the best headphone experiences I have had. And easily the best for the money spent, in my own experience.

I cannot offer any impressions yet of the TI-1a/b adapter box. I did have one on hand for a bit but lacked any headphone amplifiers of adequate power at the time to do better than the Jot R. But it is an exciting development and I applaud Raal Requisite for further democratizing access to these wonderful monitors by lowering the barrier to entry.

I encourage everyone in the market now for a new headphone in this price range, and especially anyone already owning a headphone amplifier to adapt with the new adapter boxes, to give these a listen. I’ve always felt like the open baffle SR-1a have been perceived as a novelty headphone. Without arguing the right or wrong of that, I can safely say the CA-1a is a more conventional headphone experience, with less amplification hassle and expense, and a true flagship sound quality.

Happy Listening.