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PSB SubSeries 125

Powered subwoofer

7 Reviews | 1 question - 1 answer

Item # 760SUB125

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Our take on the PSB SubSeries 125

Are you looking to add some extra bass excitement to your system? The SubSeries 125 is guaranteed to dish out low, loud, and musically lifelike bass whenever your music and movies demand it. Feel the rumble of explosions in Hollywood blockbusters, hear the crowds roar when you score a goal in your favorite video games, or relax to the taut, tuneful lows of an upright acoustic bass from a classic jazz number.

PSB SubSeries 125 powered subwoofer

Powerfully musical bass

Are you looking to add some extra bass excitement to your system? The SubSeries 125 is guaranteed to dish out low, loud, and musically lifelike bass whenever your music and movies demand it. Feel the rumble of explosions in Hollywood blockbusters, hear the crowds roar when you score a goal in your favorite video games, or relax to the taut, tuneful lows of an upright acoustic bass from a classic jazz number.

Easy, up-front controls

This sub's sonic goodness starts with its 8" woofer cone, which is designed to pump out quick, controlled, high-impact bass. It's backed by 125 watts of continuous power courtesy of the sub's built-in amplifier. Plus, the front-mounted controls make it simple to adjust the volume and crossover frequency, so you can get the best performance in your room.

Product Highlights:

  • frequency response 35-150 Hz (±3dB)
  • built-in amplifier delivers 125 watts of continuous power, 320 watts dynamic peak power
  • Class H amplifier design with discrete MOSFET output devices for superior sound quality and high efficiency
  • continuously variable low-pass 50-150 Hz crossover
  • 8" polypropylene woofer cone
  • bass-reflex (ported) enclosure
  • front-mounted volume and crossover controls
  • rear-mounted phase switch
  • auto on/off
  • line-level/LFE and speaker-level inputs
  • black ash finish
  • 9-11/16"W x 14-1/8"H x 16-3/16"D
  • weight: 24 lbs.
  • warranty: 5 years subwoofer, 1 year amplifier
  • Our 60-day money-back guarantee

What's in the Box:

  • Powered subwoofer
  • 6' AC power cord (IEC 2-prong type)
  • Quick Start Subwoofer Guide
  • Limited Warranty sheet

PSB SubSeries 125 Reviews

Average Customer Review(s):

(7 Reviews)

The final bass touch

Anonymous from San Diego, CA on 5/2/2017

Crutchfield Customer Review (What's this?)

Briefly, I bought the PSB SubSeries 125 to augment my Epos Epic 2 speakers in a relatively small home office. While the latter has superbly accomplished bass for being bookshelf speakers, going easily down to 48 Hz at my preferred volumes, I yearned for the full audible spectrum of bass. The 125's have given me that. I typically have the sub-woofer volume set at 10 0'clock and the cross over at 65 Hz - a sweet spot I've found when running main speakers with good woofers. That their dedicated amplifier comes from NAD (PSB's sister company), was a consideration in choosing them - My office system being purely NAD equipment. Not for the integration as for knowing the quality of the power-side electronics.

Pros: Having both volume and crossover controls on the front panel, making it very easy to tweak.

Cons: None to date

Great speaker for nearfield

Tom from San Jose, CA on 2/28/2017

Crutchfield Customer Review (What's this?)

I was looking at the PSB 200 to go with my PSB Imagine Mini's on my nearfield desktop system. (The 200 shows that it has an NAD amp, so I figured it would better match my NAD 7050 amp.) The Crutchfield rep said that the 125 was more than up to the task and that it was very accurate as well. And he was right. I am quite happy with the 125. I find that the front adjustment knobs make tuning the 125 to be quite easy. Overall I was pleasantly surprised at how powerful this sub is and would definitely recommend it for others looking for a nearfield sub.



PSB SubSeries 125

jeffrey from Sarasota fl on 8/11/2016

Crutchfield Customer Review (What's this?)

Great little sub,Nice,tight clean bass.If your looking to shake your house apart this my not be the sub for you,But if your looking for tight clean bass that sounds awsome and bass you can feel you will love this sub.I bought two of these subs because they were small enough to fit in my tv stand.Heard but not seen.

Pros: Audiophile quality sound in a small package


PSB SubSeries 125

Thomas from Ashland WI on 3/12/2016

Crutchfield Customer Review (What's this?)

I have it hooked up to a 2.1 system with Infinity Primus P363 speakers. Very nice, but with almost no bass response. So, I added the PSB 125 into the mix. Oh my!! This thing fills my living room with outstanding bass. It is small enough to fit under a table, yet powerful enough to stand tall with the big boys. I use it mostly for music.

Pros: Sounds great. Small size. Looks good too.

Cons: They say the front grill is removable. Maybe it is, maybe it's not. Take it off and be prepared to spend an hour putting it back on.

High End for Small Rooms

Jay P. B. from bangor, ME on 2/15/2016

Crutchfield Customer Review (What's this?)

Great Little Sub

Pros: High End Thump for music and movies. Fits great with small fronts and a solid receiver. Very Clear Bass.

Cons: Automatic Front Light only turns on when getting an accurate signal.

PSB subseries 125

majed from Massachusetts on 2/22/2015

Crutchfield Customer Review (What's this?)

Very powerful subwoofer

Pros: nice subwoofer and very powerful

Cons: somewhat big

Good addition to bookshelf speaker system

Bob-D from Beverly, Ma. on 2/15/2013

Crutchfield Customer Review (What's this?)

I purchased this sub as to supplement my Def Tech Studio Monitor 55 speakers (driven by a NAD C356DAC). This set-up is used in a family room music/TV/Movie system. The room is about 14x20. My main goal was a speaker with small size with solid low end at low and moderate volume levels. It totally fits the bill for music playback and movie/TV sound. I wasn't interested in earth shaking/window rattling levels. Surprisingly enough, this sub can still make your pant legs vibrate during movie action scenes. More importantly, it has a quick, articulate response with the music I listen to (70's and 80's rock, small and big band jazz and acoustic/vocalists, etc.). I'm surprised at how well this speaker fills the room with good, clean solid bass without becoming overbearing. To me, this is especially important when watching movies as I find most subs tend to overwhelm voices/dialog of many movies and TV shows.

Pros: Articulate at low and moderate volume levels. Space saving design.

Cons: Breaks up on the lowest notes when used at maximum volume


Hands-on research

Features and Specs

Enclosure Bass Reflex
Video Shielded Yes
Woofer Size (inches) 8
Woofer Composition Polypropylene
Firing Direction Front
Wireless No
Preamp-Level Inputs Yes
Speaker-Level Inputs Yes
Speaker-Level Outputs No
Low-Pass Crossover Freq 50-150Hz
High-Pass Crossover Freq None
Phase Switch Yes
Amplifier Output (watts) 125
Frequency Response 35-150 Hz
Height (inches) 14-1/8
Width (inches) 9-11/16
Depth (inches) 16-3/16
Weight 24 lbs
Speaker Parts Warranty 5 Years
Speaker Labor Warranty 5 Years
Amplifier Parts Warranty 1 Year
Amplifier Labor Warranty 1 Year

Product Research



PSB SubSeries: The PSB SubSeries 125 powered subwoofer is designed to provide the flattest possible frequency response, full bass extension, low distortion, and high output. The PSB SubSeries powered subwoofer is perfect for music and movie soundtracks.

Class D Discrete MOSFET Amp (from NAD): The PSB SubSeries 125 powered subwoofer employs a custom-designed Class D discrete MOSFET amplifier (125W RMS/320W Peak) from NAD. The integrated digital amplifier from NAD features an automatic varying switching frequency that maintains maximum efficiency and low THD under all conditions. The Class D amplifier also incorporates proprietary limiting circuitry preventing audible overload while remaining true to the dynamics of your music or movie sound track. This circuitry combines peak limiting circuits that hold amplifier signal swing to the point just short of the amplifier's clipping, with compression circuitry that will reduce the amplifier's gain.

8" Woofer: To compliment the powerful Class D amplifier, the SubSeries 125 uses a front-firing 8" polypropylene cone woofer with rubber surround, 1.5" voice coil, and 28oz magnet. The PSB woofer is designed to reduce mechanical noise and prevent harsh sounds at extreme excursion.

Bass-Reflex Cabinet: The PSB SubSeries 125 powered subwoofer features a bass-reflex cabinet with a front-firing  slot port (1" x 8") for greater efficiency and bass response.


Front-Mounted Controls: Two rotary control knobs (volume/crossover) are provided on the front of the subwoofer for added convenience.

Volume Control: The rotary volume knob controls the output level of the powered subwoofer, relative to the volume of the other speakers in the system.

Low-Pass Crossover: There is an external/internal crossover switch on the back of the powered sub. If you select the "internal" position, the low-pass crossover adjusts the high-frequency roll-off of signals sent to the subwoofer. The control is continuously variable from 50 Hz to 150 Hz, and allows you to precisely match the subwoofer's bass production with your system's main left & right stereo speakers. If you select the "external" position, the powered sub's low-pass crossover is bypassed.

Phase Switch: The phase switch allows for the adjustment of the phase of the subwoofer in relation to the speakers used in the system; either 0 or 180 degrees.

Auto On/Off: The powered subwoofer features a main power switch on the back panel. When switched to On, the subwoofer is initially in stand-by mode, awaiting the presence of an audio signal. When the signal is received, the subwoofer turns on automatically. When no signal is detected, the sub's amp will automatically turn off after approximately 15 minutes. In the Off position, the subwoofer will not power up. A green LED, located on the front panel between the control knobs, will glow when the subwoofer is active (it will glow red when off).


Low Level Input: Two gold-plated RCA jacks are provided for connecting your receiver via the low-level input. You can use a single RCA cable to connect the Subwoofer or LFE (low frequency effects) Output from your receiver, preamplifier, or integrated amp. Either the left or right channel inputs can be used. Since most subwoofer/LFE outputs are filtered by most receivers/processors, the subwoofer's variable low-pass filter is usually not required and should be bypassed. This is done by placing the crossover switch to the External Crossover (LFE Input) position. If your receiver or integrated amplifier has preamp outputs, or if you are using a preamplifier without a designated subwoofer/LFE output, the preferred connection is to use a stereo RCA cable plugged into both left and right inputs. If the preamp outputs are unfiltered, the subwoofer's internal crossover should be used and the switch placed in the "Internal Crossover" position.

Speaker Level In: Two pairs of 5-way binding post terminals (for left and right channel) are provided for connecting the sub with speaker wire. The terminals will accept bare wire, spade lugs, pin connectors, and single or dual banana plugs. The plastic inserts must first be removed from the terminals before using banana plugs. Speaker wires can also be run from the subwoofer directly to the main speakers, eliminating the need to run wires from the receiver or amplifier to the main speakers.

Power Cord: The subwoofer has a removable 6' power cord with an IEC 2-pronged connector. This allows you to use a third-party IEC-type power cord, if desired.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

to match an existing unit [ Nicholas  Sep 18, 2017 ]
will fit nicely with my Imagine B speakers on a little stereo set up. [ Michael  Jun 24, 2016 ]
Similar to original equipment installed [ John  Mar 03, 2016 ]
Needed a small quality musical sub for low volume smaller room with quality book shelf speakers and receiver. [ Jay P.  Jan 30, 2016 ]
Great experience - had my subwoofer in stock and should be here by Christmas [ JOSH  Dec 21, 2015 ]

1 question already asked

Thanks for your question. This is a bass-reflex (ported) enclosure. You'll find this information on the product page under "Highlights". [ Kenny  May 30, 2016 ]  Staff