The Xi Audio Broadway is a transportable balanced/single-ended Class A headphone amplifier with both AC and battery power supply. It is priced at $2,299.
Disclaimer: The Xi Audio Broadway sent to us for the purposes of this review is a sample and does not have to be returned. Thank you to Xi Audio for giving us this opportunity.
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So, hot after we did our initial impressions of the impressive Monoprice Monolith Liquid Platinum hybrid tube amp comes another potentially impressive headphone amp, the solid-state Xi Audio Broadway.
This is the full-balanced version and not the more efficient single-ended S variant built more for IEMs and easy to drive headphones. This one has a bit of power!
Now, we reviewed the Formula S flagship solid-state Class A amp in mid-2018 and chucked it the headphone desktop solid-state amp of the year award and rightly so. That was and still is, one heck of a resolving and sweet-sounding headphone amplifier. I tend to reference with this amp for pretty much every headphone review these days alongside the V281 from Violectric and the Auris HA-2SE.
It was a no brainer then that we would pick up the option to review the slightly cheaper Broadway to see if the engineering pedigree trickled down to produce an equally stunning performance.
Balanced & Unbalanced
The Xi Audio Broadway comes in two versions, balanced and unbalanced. The unbalanced is tagged as Broadway S and contains a set of dual RCA to the rear and an unbalanced 6.35mm output to the front. It also has a 4-pin XLR output but this is not a balanced output. The Broadway S also sells for a little cheaper at $1599.
The version in this feature is the fully discreet Class-A balanced version. It has a set of dual XLR to the rear and a balanced 4-pin XLR output at the front. Rather interestingly this is the first desktop amp that I have ever reviewed that also has a balanced 4.4mm output. That is going to be very useful with the likes of the SendyAudio Aiva planar headphone that comes with a 4.4mm terminated cable.
Output power is a pretty good 1500mW into a 32Ω load. That should be capable enough for most modern planars out there but a little shy of the kind of power I like to see for really demanding headphones like the Hifiman HE6.
The flagship Formula S, for example, is capable of 3-4W on a similar load and it would be that amp I would pull out for the ultimate in dynamic range and riving power. Still, the like of the Empyrean, RAD-o and Ether 2 should have no issues being driven from the Broadway.
The really interesting tech inside the Broadway is the ability for it to be battery-driven as well as AC powered. Simply open up the top chassis plate and you will see 4 battery slots suited for Lithium 18650s. This allows you to come off the mains supply and potentially filter out a lot of unwanted dirty electricity as well as reduce potential grounding issues.
You can also charge the batteries via the AC supply when they run dry. The quality of the 18650s has always been a concern of mine as a vaper and the advice is the same as it is with the Broadway. Get some good ones. Most will say the “brown 18650s”. Normally LG branded ones last the longest and perform to specification. You can get cheaper but results may vary.
Unboxing & Accessories
Sadly, my unit did not come in the official packaging being a sample unit but from what I have been told it is nothing to get excited about. It’s merely a brown box with some padding to protect the unit from shipping rather than some fancy Auris Audio style crate.
Inside you do not actually get the required 24V 1A external switching power supply needed which is strange but you do get a circular connector cable that will allow you to connect the Broadway to Xi Audio’s own dedicated Powerman power supply component. I had to source one in the local hardware store but you can grab them online for around $20 or less.
Batteries are not included either so you will have to source them also but they are not that expensive at around $10 each for decent ones. Make sure you buy rechargeable LG ones. Aside from that, you get a small two-page manual inside the box.
The Broadway has a certain utilitarian or industrial feel to it and not quite as flashy as the Formula S design. That being said, it is much smaller and lighter, small enough to sit beside your desktop setup at home or the office and not cramp your style. With the batteries, it weighs just over a kilo also so it is hardly a weighty amplifier either.
The old school boxy design has some fairly sharp cornering so that is the only thing I would advise caution on when handling but other than that it is a solid robust aluminum chassis with an all-black finish. All labels are in a very legible off-white front and back and grip is provided by some attractive silver tripod style rubber feet. The large alps potentiometer to the front is deep, smooth and grippy. No complaints there so far.
To the rear, you have the XLR balanced analog inputs, the DC input and the on/off switch. The on/off switch caught me out originally and I actually thought I had a DOA unit. It is fairly stiff switch mechanism so you have to apply a little bit of force upwards until you hear the switch turn on and the opposite direction for off. You can actually push it in but this won’t power on the unit.
You will notice four screws on the top plate of the amplifier and this allows you to get inside and change those batteries if required. I found so far that I don’t really need to touch this after the initial insertion since the batteries should be rechargeable. The AC power will charge them and you can just leave them there until they die. Mind you, if you are not using the amplifier for a while best to slip them out in case they leak.
Xi Audio is stating around 6 hours battery life on a full charge which actually sounds pretty good given the output power of the unit and its Class A design. I look forward to putting that to the test in the main review and if some batteries last longer than others.
One nifty little feature on the Broadway is the hardware gain control on the base of the amplifier housing. The gain is controlled via two small white switches per output stage in a red enclosure. You can set the levels to 10 dB (Low) and 16 dB (High).
Initial Sound Impressions
Initial impressions testing was done with the Meze Empyrean and SendyAudio’s Aiva using the AK380/Dock balanced out system as the source.
I decided to work the 4.4mm with the SendyAudio Aiva first and switch between the Broadway and Lotoo’s PAW Gold Touch to see what kind of differences popped up. Obviously, there is more headroom on the Broadway 4.4mm balanced out with far more power on tap and you can hear that how much snappier and more dynamic sounding the Aiva is on that output compared to the PAW Touch.
The PAW Touch is fairly neutral so it is never going to be a gutsy musical signature and the Broadway seems to have a slightly smoother or sweeter timbre. One thing to note we are using an AK380 DAC-balanced line out and it could well be the Broadway is very transparent since the AK380 timbre is on the smoother side. We will know more with various DACs tested in the main review.
With this pairing, the Broadway/Aiva presentation also had a bit more punch and weight on the low-end compared to the PAW Touch. Treble also sounds very stable, very articulate and not a hint of underpowered brittleness to its sound.
There is just a hint of dynamic range and power in the low-end fading when I take out the AC and go with battery power only. It is very subtle however which is promising as the tested batteries are not LG 18650’s but rather some cheap OEM ones from the hardware store. We will be battery rolling to confirm that but I expect better from the “brown variant” batteries.
Going XLR with the Empyrean so far sounds excellent with a punchy performance retaining an excellent level of dynamic range. It is not an aggressive sound mind you, the Violectric V281 is harder hitting in that regard. I would say it does not stray too far from the Formula S tuning and retains that slight sweetness to the timbre. There is also some excellent clarity, a black background, and some great speed.
Right so main review to-do list time. It really needs to start with the batteries and then to the source. How transparent the Broadway amp is I can only tell you once I have tried 2-3 DACs side by side. The AK380 is a fairly smooth sounding DAP anyhow and I felt I heard some of that in the Broadway presentation. Some more comparisons will help nail how much coloration is in the Broadway presentation.
Better batteries than the cheap OEM ones is a must also and then we will hit the amp with some demanding headphone such as the Diana Phi and HE6 just to see where the limits are. Until then, stay tuned!
- Frequency Response: DC-100 kHz
- Power: 1500 mW @ 32 ohms fully balanced class-A operation (amplifier biased full on at all times, no edgy crossover distortion typical of other amplifiers)
- Signal to noise ratio: 130 dB
- Run time: Approx. 6 hours on a full battery, indefinitely while connected to AC Charge adaptor
- Inputs: Stereo balanced 3 pin XLR’s
- High-quality volume adjust potentiometer
- Headphone Outputs: 4-pin balanced XLR and 4.4 mm Pentaconn
- Batteries: Replaceable 18650 x 4
- AC Charge adaptor: 100-240 VAC, 50-60 Hz. (Unit has built-in battery management, auto-off on low battery, auto charge)
- Dimension: 212 mm L x 156 mm L (190 mm including volume control) x *48 mm H
- Weight: Approx. 1150 grams with battery