psb speakers subseries 300 - nextmedia · pdf fileisn’t exactly evidenced by the...

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ON TEST 26 www.avhub.com.au Australian Hi-Fi P SB Speakers was founded by Canadian loudspeaker designer Paul Barton and his wife Sue (Paul and Sue Bar- ton… get it?). Their company became so successful that the privately owned Canadian Lenbrook Group (which also owns NAD and Bluesound) made them an offer for it that they couldn’t refuse… particularly since they wanted Paul to stay on as head designer. Barton is renowned as a ‘sound first, looks second’ designer, one who won’t sacrifice sound quality for fashion, but his philosophy isn’t exactly evidenced by the SubSeries 300 because, although it’s not particularly small, I think it’s spectacularly good-looking for a subwoofer. Most subwoofers look ‘boxy’ to me, but I think the PSB SubSeries 300 is rather elegant… at least for a subwoofer! It was amongst the first-ever PSB subwoofers to be powered by a Class-D amplifier (not surprisingly, this amplifier is manufactured by NAD). The SubSeries 300 was also one of the first of PSB’s low-cost subwoofers to in- clude Barton’s ‘Smart Bass’ limiter, which had previously been used only in PSB’s flagship models. The SubSeries 300 has been around for a few years now, so PSB is obviously hap- py with both its performance and its sales figures. THE EQUIPMENT As I intimated in the introduction, I really liked the SubSeries 300’s looks, because I rather like the ‘form factor’ of it: rather than being squat and square like most subwoofers, it’s kind of lean and tall, with the height given a big boost by those four tall feet underneath that elevate the bottom of the cabinet a full 90mm above your floor. As you’d expect of Paul Barton, there’s a reason for this elevation, and it’s that the SubSeries 300 is a bass reflex design, and the port exits through the base of the subwoofer. Having such tall feet means you’ll always get the full contribution from the port’s output, even if you’ve placed the subwoofer on a deep pile carpet and positioned it in a corner, where the output from two sides would be blocked off by the adjacent walls. The front-firing bass driver is sizable: PSB rates it at 300mm in diameter. I couldn’t confirm this, because the way PSB mounts the driver prevented me from measuring the overall diameter, but the moving diameter (that is, from one edge of the rubber surround to the opposite edge) measured 275mm, so 300mm seemed about right. But as regular readers of Australian Hi-Fi Magazine would know, the important measurement is the Thiele/Small diameter, because it’s this that determines the effective cone area, or radiat- ing area (known technically as the Sd). This measured 260mm, giving an Sd of 531cm². The cone is made from polypropylene and has a very large central dustcap. Beneath the dustcap is a 50mm diameter voice coil, driven in part by a magnet that tips the scales at 1.4kg. (If you’re into comparisons, this driver is the same size as the one used in the PSB Series 500 subwoofer, and has the same sized voice coil. The cone of the driver in the 500, however, is made from woven fibreglass, and the magnet is much larger, at 2.27kg.) The driver is driven by a Class-D amplifier rated with a continuous power output capa- bility of 300-watts, although into what im- pedance is not stated. It’s from this 300-watt rating that the SubSeries 300 gains its model number. As you can see from the photograph of the SubSeries 300, PSB has positioned the rotary volume and crossover frequency SUBWOOFER PSB SPEAKERS SUBSERIES 300

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Page 1: PSB SPeakerS SuBSerieS 300 - nextmedia · PDF fileisn’t exactly evidenced by the SubSeries 300 ... of Bach’s Toccata in Fugue in D Minor, BWV 565 ... Emerson Lake and Palmer’s

O N T E S T

26 www.avhub.com.auAustralian Hi-Fi

PSB Speakers was founded by Canadian loudspeaker designer Paul Barton and his wife Sue (Paul and Sue Bar-ton… get it?). Their company became so successful that the privately owned Canadian

Lenbrook Group (which also owns NAD and Bluesound) made them an offer for it that they couldn’t refuse… particularly since they wanted Paul to stay on as head designer.

Barton is renowned as a ‘sound first, looks second’ designer, one who won’t sacrifice sound quality for fashion, but his philosophy isn’t exactly evidenced by the SubSeries 300 because, although it’s not particularly small, I think it’s spectacularly good-looking for a subwoofer. Most subwoofers look ‘boxy’ to me, but I think the PSB SubSeries 300 is rather elegant… at least for a subwoofer! It was amongst the first-ever PSB subwoofers to be powered by a Class-D amplifier (not surprisingly, this amplifier is manufactured by NAD). The SubSeries 300 was also one of the first of PSB’s low-cost subwoofers to in-clude Barton’s ‘Smart Bass’ limiter, which had previously been used only in PSB’s flagship models. The SubSeries 300 has been around for a few years now, so PSB is obviously hap-py with both its performance and its sales figures.

The equipmenTAs I intimated in the introduction, I really liked the SubSeries 300’s looks, because I rather like the ‘form factor’ of it: rather than being squat and square like most subwoofers, it’s kind of lean and tall, with the height given a big boost by those four tall feet underneath that elevate the bottom of the cabinet a full 90mm above your floor.

As you’d expect of Paul Barton, there’s a reason for this elevation, and it’s that the SubSeries 300 is a bass reflex design, and the port exits through the base of the subwoofer. Having such tall feet means you’ll always get the full contribution from the port’s output, even if you’ve placed the subwoofer on a deep pile carpet and positioned it in a corner, where the output from two sides would be blocked off by the adjacent walls.

The front-firing bass driver is sizable: PSB rates it at 300mm in diameter. I couldn’t confirm this, because the way PSB mounts the driver prevented me from measuring the overall diameter, but the moving diameter (that is, from one edge of the rubber surround to the opposite edge) measured 275mm, so 300mm seemed about right. But as regular readers of Australian Hi-Fi Magazine would know, the important measurement is the Thiele/Small diameter, because it’s this that

determines the effective cone area, or radiat-ing area (known technically as the Sd). This measured 260mm, giving an Sd of 531cm². The cone is made from polypropylene and has a very large central dustcap. Beneath the dustcap is a 50mm diameter voice coil, driven in part by a magnet that tips the scales at 1.4kg. (If you’re into comparisons, this driver is the same size as the one used in the PSB Series 500 subwoofer, and has the same sized voice coil. The cone of the driver in the 500, however, is made from woven fibreglass, and the magnet is much larger, at 2.27kg.)

The driver is driven by a Class-D amplifier rated with a continuous power output capa-bility of 300-watts, although into what im-pedance is not stated. It’s from this 300-watt rating that the SubSeries 300 gains its model number. As you can see from the photograph of the SubSeries 300, PSB has positioned the rotary volume and crossover frequency

subwoofer

PSB SPeakerSSuBSerieS 300

Page 2: PSB SPeakerS SuBSerieS 300 - nextmedia · PDF fileisn’t exactly evidenced by the SubSeries 300 ... of Bach’s Toccata in Fugue in D Minor, BWV 565 ... Emerson Lake and Palmer’s

PSB Speakers SubSeries 300 Subwoofer

27Australian Hi-Fi

controls in a recess on the front panel, be-neath which are a phase switch (0/180°) and a power LED. The crossover control operates from 50Hz to 150Hz, with calibration marks at 80Hz and 110Hz.

The rear panel has both an LFE input and an LFE output (about which more in a mo-ment), as well as line level inputs and output, plus high level (speaker level) inputs. The line level inputs and outputs are all RCA sockets, while the speaker level inputs are multi-way banana-capable speaker connectors. There’s a single on/off power switch and a standard IEC 240V input… except that since the sub-woofer’s amplifier is double-insulated, there’s no earth pin. I was quite impressed that in addition to the US and European safety la-

bels, the amplifier plate also had an Australi-an C-Tick number screen-printed on it.

Why is there an LFE output? It’s to make it easy to add a second subwoofer, which you’d do by ‘daisy-chaining’. Using a second sub-woofer nearly always improves bass response because any single subwoofer—no matter how good its performance—will always be unable to create the correct levels of bass at multiple points in the listening room, be-cause of room modes caused by the physical dimensions of that room. These modes mean that at some points in the room you will get correct levels, and at others, incorrect (low) levels. By adding a second subwoofer at a dif-ferent location to the first, you can energise the points in the room that the first sub-woofer could not, so you’ll get a more-equal distribution of bass through the entire room. To its credit, PSB explains this very thorough-ly in its instruction manual. You can also use the line-level output to daisy-chain.

Speaking of PSB’s manual, it’s very good, giving excellent advice on how to position a subwoofer in the room, and how to calibrate the PSB SubSeries 300 for best performance in your room without using any measuring equipment. However, you can only ensure perfect performance by using test equipment and these days, that test equipment can be your own mobile phone. You can read a full article on how to calibrate your subwoof-er’s volume, crossover frequency and phase controls for best performance in your room,

The room was energised powerfully enough that my stomach could feel the note as well as my ears perceived it

with whatever speakers you’re using, with your mobile phone here: www.tinyurl.com/subwoofer-calibration.

My sole criticism of the PSB’s manual is that it’s a ‘General’ manual, so some of the connection diagrams have diagrams that would not apply to the PSB SubSeries 300, which some users might find confusing. So far as physical size is concerned, the PSB Sub-Series 300 measures 390×510×441mm (HWD) and weighs just shy of 20 kilograms.

in use and LisTening sessionsHaving already determined the best position for a subwoofer in my listening room (using the simple and foolproof system detailed

here: www.tinyurl.com/subwoofer-placement) it was simply a matter of moving my own subwoofer out of the way, and putting the PSB SubSeries 300 in its place. I mention this primarily to make it clear that once you have established the

best position in your room for one subwoof-er, that same position will be the best for any subwoofer; you’ll never have to work it out again, and it doesn’t matter if one subwoofer has a forward-firing driver and port, and the other subwoofer has a downward-firing port, the best position in the room for a subwoofer will always be the best position in the room for any subwoofer. I did, however, have to calibrate the PSB SubSeries 300’s volume,

crossover frequency and phase controls to best-match my main speakers, so I did this using the calibration process referenced earli-er (www.tinyurl.com/subwoofer-calibration). While calibrating, I had a minor beef with the rotary controls: they’re so close together that I found it a little difficult to turn one without bumping the other. You can adjust one without bumping the other, but you have to be a little careful!

It didn’t take more than the second bar of Bach’s Toccata in Fugue in D Minor, BWV 565 (still a favourite, despite—or perhaps because of—being the very first organ work I learned after I switched from playing piano to playing organ) to discover the PSB SubSeries300 was the real McCoy in the ‘powerful bass’ department. The minute the pedalled low ‘D’ comes in towards the end of the second bar, preceding the arpeggio, the room was energised powerfully enough that my stomach could feel the note as well as my ears perceived it aurally. Fabulous! And it wasn’t just the depth of the bass: When it came to the Prestissimo section in bar 24, the PSB proved to be particularly fast and nimble—I could not hear any overhang from any of the notes, despite the speed at which they’re played, and the tonality was perfect. Excellent performance.

Pre-warned by the editor that most readers would not own any organ music, and in honour of the late Keith Emerson, I proceed to play Emerson Lake and Palmer’s wonderful self-titled debut album, followed by their second, equal-ly-wonderful album Tarkus, which in addition to being a superb album, contains some of the lowest notes ever recorded in rock music.

Because the PSB SubSeries 300 is a bass reflex design, and the port exits through the base of the subwoofer, the provision of 90mm feet means you’ll always get the full contribution from the port’s output, even if you’ve placed the sub-woofer on a deep pile carpet and positioned it in a corner, where the output from two sides would be blocked off by the adjacent walls.

Page 3: PSB SPeakerS SuBSerieS 300 - nextmedia · PDF fileisn’t exactly evidenced by the SubSeries 300 ... of Bach’s Toccata in Fugue in D Minor, BWV 565 ... Emerson Lake and Palmer’s

O N T E S T PSB Speakers SubSeries 300 Subwoofer

28 www.avhub.com.auAustralian Hi-Fi

For both albums, the PSB SubSeries 300 sub-woofer reproduced the lowest notes of both Keith Emerson’s keyboards and Greg Lake’s bass guitar perfectly: rock solid, depthy bass, with no overhang. The impact of Carl Palm-er’s kick drum is genuinely palpable. If you haven’t heard ELP (shame!), I’d only bother listening to these first two albums, which are indisputably their best. For non-ELP fans, an alternative rock album for testing deep bass would be Dark Side of the Moon. I listened, and once again admired the performance of the PSB SubSeries 300… as well as the genius of Pink Floyd.

I trialled the LFE input by moving the PSB SubSeries 300 to my home theatre room and connecting it to my 5.1-channel AV receiver, where I had to re-calibrate it for the smaller speakers I have in this room, a process that was painless, because the PSB SubSeries 300 integrated with my small speakers just as well as it did with my large floorstanders. There-after it became my ‘live-in’ sub for regular TV watching, as well as movie sessions, and I was totally satisfied with its performance in both roles, particularly with movie sound effects, where it really kicks, sounding totally realistic even when producing sound effects that probably weren’t real at all, but comput-er-generated.

During all my listening sessions, both with music and home theatre, I completely overlooked PSB’s so-called ‘smart bass’ circuit, which is actually PSB’s proprietary version of a limiting circuit: a type of circuit designed to prevent audible overload. But the very fact that I’d forgotten about it proved that it was not audible in day-to-day use, so I thought I’d see if I could cause it to be audible, by using sine waves on a test disc and turning up the volume to ridiculously high levels. Not surprisingly, the circuit didn’t allow me to do this! Once I’d turned the volume high enough that I would otherwise have been overloading the driver and causing audible distortion, the limiter kicked in to prevent this happening, so all I heard was that the sound wasn’t getting any louder despite me turning the volume control further and further clockwise. I really couldn’t hear when

this happened, so the circuit is audibly trans-parent. Since I couldn’t hear any deleterious effects when listening to pure tones, I suspected I wouldn’t be able to hear any when listening to either music or to movie soundtracks, and this indeed proved to be the case when I tried it. When I turned the volume high enough that the limiter just had to be kicking in, I really couldn’t tell: all I heard was nice, clean (albeit very LOUD!) bass.

One thing I did hear was the automatic power-on switching circuit kicking in. I hadn’t realised the PSB SubSeries 300 even had auto-matic power-on circuitry until the second day of reviewing, because I’d left the subwoofer switched on overnight, and when I started playing music the next day, the subwoofer didn’t kick in until a second or two after the music had started. The good news is that once the circuit has kicked in, it stays active for suffi-ciently long that it doesn’t cause any nuisance switching… you’ll only hear it when you first start listening to music, or watching a movie.

I’d like to tell you how long it takes before the circuit switches off once a signal is removed but, frankly, it takes so long that I got bored waiting for it to happen. So the answer is, in true Rolls-Royce parlance, ‘long enough’.

ConCLusionI found PSB’s SubSeries 300 to be a truly great subwoofer and one that will work just as well with large floor-standing loudspeakers as it will with smaller, bookshelf models. It has the pedigree, the performance, the power and a totally realistic price. Gary Williams

ContaCt DetailS

Brand: PSB Speakers

model: SubSeries 300

Category: Powered Subwoofer

RRp: $1,999

Warranty: Two Years

distributor: Qualifi Pty Ltd

phone: 1800 242 426 or (03) 8542 1111

email: [email protected]

uRL: www.qualifi.com.au

• Finish choices

• Looks great

• Sounds fabulous

• Well-equipped

A truly great subwoofer with pedigree, performance, power and a totally realistic price...

See laB rePort on P age 82

Page 4: PSB SPeakerS SuBSerieS 300 - nextmedia · PDF fileisn’t exactly evidenced by the SubSeries 300 ... of Bach’s Toccata in Fugue in D Minor, BWV 565 ... Emerson Lake and Palmer’s

L A B R E P O R T PSB Speakers SubSeries 300 Subwoofer

82 www.avhub.com.auAustralian Hi-Fi

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Newport Test LabsFigure 1. Nearfield sine frequency re-sponse of bass driver using line inputs with crossover control set to Max (150Hz) [Black trace] and Min (50Hz) [Red trace]. [PSB SubSeries 300]

Figure 2. Nearfield sine frequency re-sponse of bass driver using LFE input [Green trace] and line input with crossover control set to Max (150Hz) [Black trace]. [PSB SubSeries 300]

Figure 3. Nearfield sine frequency response of bass driver and port with crossover control set to 50Hz and 150Hz. (Note that data for port has not been re-scaled to compen-sate for differences in radiating area.) [PSB SubSeries 300 Subwoofer]

Figure 4. Pink noise frequency responses (smoothed) at 2.0 metres with crossover control at Max (150Hz) [Black trace] and Min (50Hz) [Red trace]. [PSB SubSeries 300 Subwoofer]

Figure 1 shows the nearfield results for the frequency response of just the PSB SubSeries 300’s bass driver using the line input, and with the crossover control set for 150Hz (black trace) and 50Hz (red trace). You can see that below 40Hz, the two responses are iden-tical. Above 40Hz, the ‘max’ trace extends out to 150Hz before rolling off significantly, while the ‘min’ trace extends to just 70Hz before rolling off significantly.

Figure 2 shows the difference between using the LFE input (green trace) and the line level input when the crossover control is set to maximum (150Hz). Below 100Hz the two traces are identical, but above 150Hz, the LFE trace is slightly more extended, so PSB is obviously expecting (and quite rightly) that the AV receiver’s own LFE circuit will do the necessary filtering.

Figure 3 adds the output of the port to the responses shown in Graph 1, though you should note that the port’s responses have not been re-scaled to compensate for the differences in radiating area. As I might have expected due to the port being so large, it’s tending to re-radiate quite a bit of the direct energy from the rear of the woofer. This is not so significant at low frequencies as it would be at higher frequencies. You can see that the port’s maximum output (at 24Hz) is somewhat lower than textbook (which would be 26Hz, as this is the woofer minima), sug-gesting to me that this is not a ‘cookie-cutter’ design, but one that’s been designed by math, and then tuned by ear.

Figure 4 shows the overall in-room fre-quency response, combining the output of the port and the output of the driver on a single trace. You can see that with the crosso-ver set to minimum, the PSB SubSeries 300’s frequency response extends from 18Hz to 80Hz ±3dB. With the crossover control set to maximum, the PSB SubSeries 300’s frequency response was measured by Newport Test Labs as extending from 20Hz to 180Hz ±3dB. This is somewhat better than PSB’s own specifica-tions, both regarding the 3dB down-points and the –10dB downpoints, so this subwoofer

LaBoRaToRy TesT ResuLTs

is clearly performing at a higher level than PSB expects… so much better that I suspect that elements of its design have been improved over the many years it’s been in production, but that no-one has ever bothered (or remem-bered) to update the specifications listed in Owners’ Manual.

In sum, the PSB exhibited excellent meas-ured performance, with a very flat and very

extended response using either the LFE or line inputs (set to maximum), and a similarly well-controlled performance with the crosso-ver control set to minimum. Highly recommended! Steve Holding

The results mentioned in the report, tabulated in performance charts and/or displayed using graphs and/or photographs should be construed as applying only to the specific sample tested.

Continued from page 28

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HF Mar15_000 House Subs.indd 3 2/24/2016 10:03:41 AM