Very open, detailed, dynamic and natural sounding bipolars. Very good bass for size. Tonally well matched to my Kef 105/3 front speakers. Very efficient. No distortion or vibration at high volumes. Home Theatre Magazine - "Truly Outstanding".

None so far. I will report again when I have appraised them as part of my proposed new AV system, as they are currently just used for stereo / TruSurround when watching DVD's. To my knowledge, not available as a single unit for 6:1 centre rear surround.

This review is for the Definitive Technology UIW-BP/A In Wall Bipolars. As soon as Audioreview.com have added them to their database for 'In Wall Loudspeakers', I'll copy this review accross : I have the UIW-BP/A's in the ceiling, 3 ft from the back wall (11 ft long) and 1 ft from the side wall (15 ft long - one of the sides is part open to another room). The speakers have been mounted such that, for each assembly, one drive unit fires forward and the other backwards to give a diffused effect. I sit on a lounger 3 ft from the back wall. I've reinforced the ceiling by removing the upstairs floorboards and adding extra cross joists either side of the speakers. The whole area was then boxed in using MDF screwed, glued and sealed with silicon mastic to the joists and plasterboard. As a final measure, to simulate a loudspeaker enclosure, the sides and top of the box were covered in a sound absorption material. Each box has a volume of approximately one cubic ft. All this was hard work and time consuming, but I believe it's been worth it to improve the bass and eliminate the ceiling vibration. My wife didn't want speakers on the wall, hence the reason for choosing these and not the Definitive Technology BP1X wall bipolars. When I started listening to them, I was surprised how similar they sounded tonally to my Kef 105/3's. The Kef's are superb - fast, very natural sounding with great weight and authority. Just read the reviews in Hi-Fi Choice, Hi-Fi News, Etienne Borgers review in http//www.hometheaterhifi.com and also on this site. The Kef's, through necessity not choice, are not ideally positioned , but this doesn't really seem to affect their performance - 18 in from back wall, 9 in from side wall, 9 ft apart and angled towards the listener. My main interest is listening to my front speakers in stereo but I also love movies, hence the decision to extend my system to cover AV. Current System - Kef 105/3 main speakers - Superb. high efficiency, low distortion, huge dynamic range. Reviewed on this site. Definitive Technology UIW-BP/A ceiling speakers (can also be used in a studded wall). Denon PRA1200 pre amp - Has a very quiet moving coil input. Denon POA 4400A monoblock power amps - Effortless power, very musical, punchy, gutsy, smooth and dynamic. Reviewed on this site. Logic Dm101 electronic suspended subchassis turntable - No longer made but was easily as good as the Linn Sondek in it's day. Suspended at the three corners plus a central coil spring around the bearing. Logic Datum tone arm - Again, no longer made. Sturdy, no free play, good for moving coils. Stilton Body Audio Technica AT-F5 mc cartridge - Great tracker, refined, detailed, better bass than any CD player I've heard ! Sony 228ESD CD player - Good sound for an old player but technology has moved on and there are now much better players. I'll use this purely as a transport when I get my AV amp. Rotel RT850L tuner - Great sound with my loft aerial. Pioneer DV444 DVD player multi region - Similar to 440 model sold in the States. No progressive scan. Great picture and sound. Reviewed on this site. Denon DRM 650S cassette deck - Good sound with most makes and types of tape. Reviewed on this site. Sennheiser HD590 headphones - Very comfortable. Good sound. Reviewed on this site. Phillips PW6515 50hz 28 inch widescreen TV - Great picture. Sony Nicam Stereo VHS recorder. Cables - Maplin's 'Shark' large diameter, multi fine stranded OFC speaker cable throughout (similar to Supra cable). 'Shark' 156/0.06 OFC foil screened signal cable for long runs and QED Qunex 1 interconnects for the shorter runs. All long cables are hidden under the floorboards and behind the ceiling coving. Wharfedale Powercube 12A Subwoofer - I've only just got this and it appears to be brilliant value at under £200. I've requested for it to be added to the database for review. Ben Duncan's 'Super Spur' power supply. See Ben Duncan's article in Hi-Fi News on how to build a 'Super Spur' power supply - I think the article can be purchased from Hi-Fi News. I've used oversized armoured cable to individual metal unswitched sockets for each component. The armouring is earthed at one end to the metal distribution box to act as an RF shield and a separate earth cable taped to the outside of the armoured cable for normal earth (socket earth pin to ground). My whole system is now uncannily silent during quiet passages with no hum or noise. All aspects of the systems performance have now improved. The spur, installed by a qualified electrician, only cost £600 including parts and has been well worth it. Proposed AV package - Denon AVR 3803 or Marantz SR7300 AV receiver - Both have 12V switching for my 4400A monoblocks. Kef Q9C, Kef model 100 or a centre speaker from either Definitive Technology or M&K. In the distant future, possibly a single UIW-BP/A as a ceiling centre rear if I can find a single unit. The Denon PRA1200 will then just be u

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Having heard the BP1X speakers, the UIW BP/A's sound very similar.

When I went to find some sourround speakers I needed something to pair with my Yamaha RX-V995 and Boston Acoustics VR-950 Mains. I wanted some Boston sourrounds, the VRS Pros were $500, too much (most of it for the THX certification, which to me is a bunch of bull). So I wanted the VRS, but they told me they were discontinued, and the VRS Micros would not pair well with the 950s. My salesman pointed me towards the Definitive Bipolar BP1X Sourrounds. I couldn't get a demo due to technical difficulties in the store, but they gave me 7 days to try them (so I trusted). I molly-bolted them to the wall, ran the wires bhind the walls, and under the carpet (after a breif demo which sounded great), and playing Pro-Logic, and Dolby Digital 5.1 DVDs I was amazed at what I heard. They're even good enough to be your mains! They, unlike the VRS with just dual tweeters, are BiPolar with a tweeter and bass unit on both sides for a true diffuse sourround performance, you can't localize the sound, and the bass is powerful, more than the VRS. These are some very excellent speakers, and were built to play DD, and DTS to the fullest. Truly awesome! If you need top of the line sourrounds go for these! NOTE: Although the price is $300, I got them, about 60ft of speaker wire, with tax for a little under $300, that's why this is one of the best deals I've gotten in my whole life! 5 stars!

excellent dynamics, easily mounted

none

I bought these at a local dealer as demos as the new were out of stock and the low price offered ( full warranty included). I have been quite satisfied with this purchase and highly recommend these to anyone with a Def Tech system. Mine have been used with a Pro Cinema 100 system and they blend well with the same drivers used in both rears and front 100's. I have found no weaknesses and plan to keep them as my surrounds as I build my new home with a dedicated HT room, but will upgrade the rest of the system with BP 2006 TL's in front and a new center. My only regret is that these rears are in storage while my new home is built.

Bipolar Design

Does not include screws for wall mounting

This review is for the BP 1.2X version...

The way that my HT room is layed out I needed to be able to mount both of the surround speakers on the rear wall. This somewhat precluded using side firing Bipolar speakers such as the Paradigm ADP series, since the sound would go down the rear wall rather than into the room where the listeners are. Similarly to get good area coverage I did not want just a single driver front firing speaker.

After doing much searching I found the BP 1.2X speakers from Definitive Technologies. These speakers work very well when they are mounted on the rear wall behind the listeners. The trapezoidal shape and Bipolar design make them ideal for distributing the sound completely and evenly into a room where they are mounted on the rear wall.

I would highly recommend these speakers to anyone that wants great surround sound, at a reasonable price, particularly if you need/want to mount the speakers on the rear wall behind you. Happy Listening!!

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Compared with Paradigm ADP70 and ADP170, Bose, JBL

The placement of these speakers is very forgiving. Plus, they are able to cover the wide rear channel bandwidth of Dolby Digital. I found myself watching chapters of "The Fifth Element" over and over again...

The Definitive Tech BPX1 bipolar sourrounds are by far the best sounding sourrounds for the price. I've had these 10 months and they flat out ROCK. I too as stated before love the low background bass of "The Fifth Element." I also tested the Boston Acoustics sourrounds and was very disappointed, BUT I think Boston Acoustics sucks anyway (not natural sounding - too much highs). The Definitive speakers in general have a much, much, much more natural tone. They were an excellent price at $325 and I'm very happy. If your looking for excellent speakers that won't set you back a few months salary then buy Definitive.

90db output, more than enough power for center-rear surround. Clear sounds, midrange sound accounted for, overall clarity.

None so far. I would prefer waiting at least 2 months for a proper break-in period.

Overall, this speaker set gets the nod in terms of performance to price ratio. The guy below who says it has no midrange is obviously not placing them correctly. Three feet above your ear level, at an angle of 120 degrees in proportion to the head is a good starting point my friend.
The best movie to listen to with these speakers is Batman and Robin. An otherwise atrocious movie to view, but the opening credits while listening to these surround bipolar Def Tech speakers is incredible. Turn it up as loud as you can, and just try not to let your jaw hit the floor when it blows you away.

As reference, I integrated these Def Techs into my Atlantic Technology T170 system (great speaker set), and the difference is negligible. Atlantic surrounds are 87db, while the BP1Xs are 90db. I watch all my DTS movies using this system and cannot stress how important location is with these beauties. Speakers are like real estate, its all about location, location, location.

I wholeheartedly recommend these great surrounds!

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Polk F/X300i

sounds muddy and hollow in the midrange, would not recommend as a match with Paradigm speakers (Esprit tower and C350 center). Does not accurately reproduce many effects sounds.

I bought a pair of BP1X surround speakers today to finish off my home theater, which consists of an Onkyo DX-555, Toshiba DVD player, Mitsubishi VCR, Boston sub/sat for the fronts, Boston VR-10 center, and a Boston VR-500 Sub. I originally bought a pair of Boston VRS-micros for the rear, but since they are limited to their side placement I returned them for the Def. Tech. BP1X pair instead. Although the D.T.'s cost more, they sounded much better than the small Bostons. After watching the movie Disturbing Behavior tonight on DVD (along with several clips from The Rock, Enemy of the State, and The Matrix) I conclude that these speakers rock. I listened for brief periods at half volume and there was no signs of distortion. I'm definitely pleased with these surrounds (and my wife is too!).

Creates a wall of sound. Outstanding definition, easy to mount.

I have a pair of BP1X mounted on the rear wall, and for a time my Mitsubshi 50" was moved to the back wall(my wife has a thing for moving furniture.) The sound was so good I almost bought another BP1X for a center speaker when I moved the tv back to the front. That was untill I listened to the Definitive Technology C-2. My sub is the ProSub 80 also by Def Tech. I own a town house, so to keep the neighbors from complaining from the lfe I installed the RBH Sound FX-80 Transduers VT-4 in my couch(see reviews Accessories-Other)now everyone is happy and I can still crank the low sound effects.I am amazed the neighbors get no vibration from the BP1X hanging on our mutual wall. My front speakers are celling mounted Def Tech Pro Monitor 100's. The BP1X really finished my Home Theater, I never realized how much I was missing untill I purchased these great Bi-Polars.