NEW LISTING 1/11/09
(click on above thumbnails to enlarge photos) 
  warranty
PIONEER
STEREO SPEAKERS
       CS-66e CS66e
Circa 1972-74
MIJ
SOLD 2/12/09

       NEW LISTING 3/30/17
 (click on above thumbnails to enlarge photos) 
warranty
 RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE PIONEER STEREO SPEAKERS
PIONEER CS-88A
 #...8145-0728
 Circa late 1974-79
MIJ

PIONEER CS-88A SPEAKERS
Condition 9
(C) M.R.
SOLD 7/6/17
SHIPPING TO ILLINOIS
 
  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

PIONEER CS-99, CS-88A, CS-77A & CS-66G TWEETER REPAIR / SURROUND RE-FOAM / RE-EDGE

JUST FYI FOR FOLKS LOOKING FOR
PIONEER CS-99, CS-88A, CS-77A & CS-66G
MODEL SPEAKERS.

Pioneer utilized foam surrounds on the tweeters of these 4 models. After 20+ years, it will be difficult to find a pair that still has the foam intact (as foam surrounds generally have a useable lifespan of 10-15 years, depending on the environment they have spent the majority of their lives in). 
Essentially 100% of the "PIONEER CS-99, CS-88A, CS-77A & CS-66G" models we have seen have their tweeter foam rotted and will need to be repaired or replaced / re-foamed (yes, it might 'look' ok, but if you 'poke' it with your finger, it will crack or crumble, thus it was bad before you poked it). We have only found one suitable "fix" for this (and yes, we have searched high and low for a 4 Ohm replacement for the CS-99A, a 16 Ohm replacement for the CS-88a, or even a suitable 8 Ohm for the CS-77a, with no* success.)


NEW INFORMATION
ORANGE COUNTY SPEAKERS NOW HAS A REPLACEMENT SURROUND THAT WILL WORK ON THIS
IT WILL NEED TO BE TRIMMED SLIGHTLY ON THE OUTSIDE, BUT WORKS WELL.
THE PART NUMBER IS:
#1-023
THEIR WEB SITE IS  www.speakerrepair.com  

(This applies only to vintage Pioneer models CS-99, CS-88a, CS-77a & CS-66G tweeters).

   

    The tweeter just to the left is from the CS-77a. Looks good, but surround is rotted.


A visibly fine surround, is still bad and will visibly deteriorate after a few songs are played on them. We see these at on-line auctions often, and in every case the speakers either still have their rotted originals or a replacement tweeter, of some-sort installed. Due to the rarity of 4 & 16 ohm tweeters, and poorly fitting '8 Ohm' tweeters out there, we have to assume that the replacement tweeters the owners / sellers have installed are of incorrect impedance, which at the least, effects high-end efficiency (volume) & at worst can create load issues for whatever amplifier they are connected to. All this while using the word "Mint" or some similar adjective to list / describe the speakers. 
Again this is only prevalent in Pioneer CS-66G, CS-77a, CS-88a and CS-99 tweeters. It is not a factor with Pioneer CS-77, CS-88, CS-99a, CS-33a, CS-66a or CS-901a's tweeters.

PS. We also see a similar problem with many other manufacturers' older speakers generally from 15+ years ago, except for the earliest versions of speakers which commonly used cloth surrounds. 

Any manufacturers' speaker utilizing foam surrounds (common from typically 1980 thru present) that is over 10 years old should be suspect.

PSS. Even though a speakers foam surrounds may "look" fine, they probably are not! Vintage speakers posted for sale by individuals & at 'on-line' auctions / yard sales have commonly not been in use for many years (other wise they probably wouldn't be for sale). In many cases, once you start playing them more than a couple minutes, you can watch the foam disintegrate (especially on the woofer) right before your eyes, just by playing 2 or 3 songs at above average volume levels.

PSSS. *We have discovered a tweeter from at least one model of 'Sony' (the Sony SSU-1270, Tweeter part number; #1-502-560-11), MAY be a suitable replacement for the Pioneer CS-88A tweeter, but we haven't tried one yet. It, most importantly, is 16 Ohms, so if one could be 'shoe-horned' in place, it MIGHT function fine. Again, we have done no tests yet.

Just FYI while you're out looking. 

  
 

PIONEER CS-99A SPEAKERS
SOLD

     

These are great speakers in all aspects. You couldn't ask for... HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?

We auditioned this pair extensively and were VERY surprised at their performance. Following the above mentioned 'barrage', our demo cuts ran the gamut from Dire Straits' "So Far Away" from their album 'Brothers in Arms', Donald Fagens, "I.G.Y." from the album "Night Fly", '24K Gold Edition of Jennifer Waren's "Famous Blue Raincoat', TLC's "Scrub" from their album 'Fan Mail' (did 'sub-bass' note @ 1'25" & 1'35" VERY well.
Due to the.... HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?

 Features include:
 

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?
   
 Specs / Specifications:
 
 System design: 5-Way, 6-Driver Acoustic Suspension / Infinite baffle
  Impedance: 8 ohms
  Efficiency: xxdB! 1w @ 1m
  Frequency Response: xxHz-xxkHz, +/- 3 dB
  Cross-over frequencies: @ 8xxHz, xk, xk & xxkHz
   Power Rating: xxx watts RMS

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?
   
   If you like the "Mid-70's Lattice" look with about the 'biggest' sound possible, then these would likely be great speakers for you! These appear to have spent  most of their life in their boxes. There was hardly any dust on them when we started their restoration. The original and REAL, Walnut wood veneer is essentially perfect, as are the grills. (we recommend running Pioneer 'Lattice grill' speakers with the grills removed. They used small metal clips for decoration and structural integrity, at each junction of the grill lattice waves. These can be a source of extraneous noise at different frequencies. This recommendation would be applicable to any Pioneer 'CS' series speaker with 'real' wood, lattice grills. Just FYI.)
 We have completely gone thru these speakers. We tested each driver independently. Both attenuators have 'painstakingly' had their contacts burnished and cleaned for 'drop-out-free' performance. Following the above work, we completely tested them with both recorded material, PN and swept them with our AF generator from 20-20,000 Hz and feeding them with the output from our Hafler P-225 Pro Power Amp, looking for any irregular vibrations / anomalies in either the drivers. driver mounting, crossovers or cabinet structure integrity. We then further auditioned with a myriad of our difficult to reproduce 'test' CD's. Entire cabinet has been frequency swept while being powered by our Hafler test amp. They performed flawlessly and sounded great! Again, we have completely gone through these and they're 'Ready to Rock'. This pair comes with original boxes and packing. Measure 24.75"h x 16.5"w x 11.5"d and weigh a heavy 52 lbs each unpacked. Includes our standard 30 day limited warranty ( excluding problems due to under / over powering).
   Pioneer CS-99A
   Cond. 9.9+++
(C) R.R.
 SOLD 4/25/17
SHIPPED / DELIVERED TO MONTANA

 

          NEW LISTING 2/17/12
 (click on above thumbnails to enlarge photos) 
warranty
VINTAGE PIONEER STEREO SPEAKERS
CS-A700
12", 3-way, Full-Range or "Multi-Amp capable speaker system"
#....1786 / 2481
  Made in Japan
  Circa 1970-72'ish
SOLD 9/23/13
SHIPPING TO OKLAHOMA
This model was one of the Pioneer "Flag-Ships" of the 'early' famous 'CS' line featuring 'FB' cones and NO foam surrounds to deteriorate on any of the drivers. Was not a...

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?

...'sonic vein' as the CS-77's and CS-88's. Decent efficiency and above average power handling characteristics. Balanced well across the board.
Features include:

- Pioneers "F.B." design dri

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?


Specs:
  
 Speaker System Type: Acoustic Suspension, 3-Way
Freq Response: xx,000 Hz
  Efficiency: xx dB 1w @ 1m
  Impedance: 8Ω

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?

  Crossover points: x0 Hz, and xKHz @ xxdB / Oct w/ Ferrite Core Woofer coil
  Recommended Power Rating: x watt max power rating

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?


These speaker had our full attention and service. Many 'vintage' speakers featured attenuators to tailor the top and mid-range levels. While this can be accomplished using a variety of different component choices, they are always going to be a 'service point' and will need to be cleaned to achieve consistent sound. The controls on the CS-A700 (and a few others) speakers are VERY difficult to service. To service them, we completely removed the crossover / input panel, then dissect / remove the shaft / switch components from the switch body. Once disassembled, then all copper traces and contacts can be burnished and 're-sprung'. Once reassembled, they function perfectly. It's a very time consuming process, but the only way to insure any level of performance. Otherwise, you'll only hear the woofer.
Our speaker tech has completely gone through and 'Certified' these. We further completely tested all drivers and inspected the gasketing material under all driver frames, as well as the back panel to insure they can reduce any possibilities of vibration or acoustic anomalies, then tested with both recorded material, PN 20-20k and swept them with our AF generator from 20-20kHz. Speakers cleaned inside and out. Cabinets were spruced up with a fresh coat of lemon oil. With the exception of a 'plant water circle' on the top of one, they look great. All drivers work and sound fine! Tested for all frequencies with a sweep generator. Also features a 'True', 3-way cross-over for super clean response especially in the "low end".
Both look and sound GREAT! Huge, accurate and loud 'Wall-O-Sound'. Very efficient as well. Check the spec!

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?

 Each measures 26" tall x 15" wide x 12.5" deep and weigh 38 lbs each unpacked. Includes our standard 30 day limited warranty ( excluding problems due to under / over powering).
Pioneer CS-A700 Stereo Speakers
Cond. 8+
(C) R.R.
SOLD 9/23/13
SHIPPING TO OKLAHOMA

  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

   

     

          NEW LISTING 2/17/12
 (click on above thumbnails to enlarge photos) 
warranty
VINTAGE PIONEER STEREO SPEAKERS
CS-901
15" Woofer, 4-way, 5-driver system"
#....2666 & 3876
  Made in Japan
  Circa 1974
(C) R.R.
 SOLD 5/7/12

  

     
(PHOTOS OF PREVIOUS PAIR OF CS-901's. CORRECT PHOTOS OF 'CS-901A' VERSION COMING (only difference is wattage rating. Cosmetically identical)

 NEW LISTING 9/6/13
  (click on above thumbnails to enlarge photos) 
warranty
VINTAGE PIONEER STEREO SPEAKERS
PIONEER CS-901A
15", 4-way, 5-driver system"
#....5732 & 6342
Made in Japan
  Circa 1975-76
SOLD 7/20/14
SHIPPED TO INDIANA

  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

     

NEW LISTING 8/4/13
(click on above thumbnails to enlarge photos) 
warranty
VINTAGE
 PIONEER HPM-40 / HPM40 STEREO SPEAKERS
#...1880 / 1881
Circa 1978-80
 for sale
SOLD 10/15/13
SHIPPING TO CALIFORNIA
 Entry model into the famous "HPM" series. The HPM-40's. The HPM series was the line designed after the famed JBL L-100 / 4311 series by personnel from JBL. These were and still are one of the best sounding, most accurate Hi-Fi speakers available. These never hang around the shop long on the rare occasion we acquire a set. These are in immaculate condition, both cosmetically and sonically.
Our speaker tech has completely gone through and 'Certified' these.
He has completely disassembled them further, testing all drivers independently. No material issues found with any of the drivers. Each was 'swept' with the AF generator while removed. All drivers were re-installed with the addition of gasketing material to further seal and eliminate any ‘flange to baffle’ rattles and buzzes. Attenuators cleaned and quiet. Grills clean and inspected for breaks. Entire speaker system then swept with our AF generator from 20-5,000 Hz and feeding them with the output from our Hafler 500 (250 watts per channel) Pro Power Amp, looking for any irregular vibrations / anomalies in either the drivers. driver mounting, crossovers or cabinet structure integrity.  Next we auditioned them with our standard, 'abusive' demo / testing CD's / cuts running the gamut from Dire Straits, 'Brothers in Arms', TLC 'Fan Mail', Allison Kraus and Union Station, Nickelback, a digital recording of a cathedral pipe organ, our 'Usher Speaker' demo CD (no not that Usher), 'Friday Night in San Francisco', with Al Dimeola, John McLaughlin and Paco DeLucia, Nickel Creek's Why Should the Fire Die, Jennifer Warnes, "Famous Blue Raincoat", and a few others, all digitally recorded and some 'DDD'. Performed great as expected. The last pair of these we had (about 5 years ago) actually were sold to a recording studio to use as monitors.
 
Their 3-way design features:

-

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?

Pioneer HPM-40 Specifications:

Speaker System Design: 3-Way, Bass Reflex
Frequency Response: xx000Hz
Efficiency: xxdB 1w @ 1m
Nominal Impedance: xΩ each
Cross-over frequencies: @ xkHz & xkHz
Power rating: xx continuous and xx peak watts

Again, our speaker tech has completely refurbished, tested and Certified these speakers performing the previously mentioned processes. Walnut grained, vinyl wrapped cabinets are in good shape. Grills are also in great shape. These things look and sound Great! If you're disappointed in most...

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?

ures 22.5" high x 12.75" wide x 12.25" deep and weigh 30 lbs unpacked. Includes our standard 30 day limited warranty ( & excluding problems due to under / over powering).
 Cond. 8.5
 PIONEER HPM-40 HOME AUDIO SPEAKERS
(C) M.R.
SOLD 10/15/13
SHIPPING TO CALIFORNIA

  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

    

    

NEW LISTING 9/6/16

(click on above thumbnails to enlarge photos) 
warranty

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
 

     

 Cabinets cleaned, then had a coat of Lemon Oil rubbed into the 'real' Walnut wood veneer and are in great shape. These speakers look and perform great!
  
 Pioneer HPM-100 Features:
 
  - 4-Way, 4-Dri...(text archived)...
  
 Pioneer HPM-100 Specifications / Specs:
 
  Frequency Response: 30-2....(text archived)...
 
 HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?
   
  Pioneer HPM-100's are from what most... (text archived) ...

Each measures 26.5" h x 15.5" w x  15" d and weighs 59 lbs unpacked.  Includes our 30 day warranty (excluding problems due to under / over powering)
  Pioneer HPM-100
   Condition 8.5++
 (C) M.R.
SOLD 4/5/14
SHIPPED TO NEW JERSEY
 
   (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)


 

     

ü  Our technician has completely gone through and 'Certified' these speakers.

ü  Speakers were entirely disassembled.  

ü  Attenuators were removed, completely disassembled (not really designed to be done, but is necessary and requires a lot of 'tedious' effort), cleaned of old / 'sticky' lube, and burnished the silver plated tracks with a fiberglass pen for static free operation, re-lubed and re-assembled. That operation is the only way to ensure the mids and tweeters on these and most any speaker with a 'rotary attenuator' will function properly for years to come.

ü  Super Tweeters replaced. This is much more involved than it might sound on the surface. We have previously written about the Super Tweeters on HPM's on some of our other pages, so we won't belabor it here, but suffice to say we ordered in and bench tested 7 tweeters to get 2 that not only functioned 'CONSISTENTLY' (meaning not just when 'torsionally stressed'), but had 'strong' (strong for this particular tweeter) and 'matched' output. That is, needless to say, an 'expensive' and time consuming additional process.

ü  One 'Tweeter' replaced. What's the 'big deal' there. Well...we tested 2 (the original and a spare we ordered that supposedly "worked find" that exhibited minor to very noticable 'buzzing' when swept from 3k to 9kHz (wouldn't have likely shown up if you're only testing with random, recorded material as most sellers do). The third on (out of one in our personal collection) did not have a 'buzz' and sounded great so we utilized that one (we'll get a replacement for ours later)

ü  One of the crossovers had a blown-up (literally) 'top end' capacitor, but all the drivers in the speaker still functioned, and this would not have been caught if we hadn't done our standard disassembly / inspection. We could have changed the capacitor, but it was either to simply install a replacement crossover.

ü  Crossover components and internal circuit boards were further inspected for any possible 'sympathetic' component vibrations.

ü  Our tech then added 'poly-spun', acoustic damping material internally as Pioneer seemed a bit 'stingy' originally.

ü  Our tech has completely tested all drivers, then re-assembled with their original  gasketing where adequate and additional gasketing material, where needed, under all driver frames to further reduce any possibilities of vibration or acoustic anomalies.

ü  Following reassembly, both were tested PN and swept them with our AF generator from all the way down to 5Hz-10kHz.
 

...Other Text archived....

Pioneer HPM-100
Condition 8.5++
SOLD 2/10/16
(C) R.R.
 
   (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

    

NEW LISTING 5/15/13
(click on above thumbnails to enlarge photos) 
warranty
VINTAGE PIONEER STEREO / HOME AUDIO SPEAKERS
PIONEER HPM-1500 / HPM1500
THE BIG ONES!
FROM THE PIONEER 'SPEC' ERA
(the HPM-1500's are the 'Military Market' / 'Euro / Asia' market version of the HPM-150)
  #...1201 & 0495
MIJ
  Circa mid 1977-79
SOLD 5/17/13
SHIPPED TO CALIFORNIA
  These were Pioneer's.... It's hard to expand on what's already been written out there about these speakers. Most fans of these know some version of their smaller brothers either the....

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?
  
Our speaker tech has completely gone through and 'Certified' these. Woofers were both re-foamed with fresh, new and 'correct' surrounds with perfect centering. We have completely tested all drivers. Both Mid and Top End attenuators were cleaned internally for static-free performance. All drivers were removed and tested individually. One of the 'Super Tweeters' (the really cool looking top one) was 'weaker' than the other, so we sourced and tested between 5 of them (Polymer, piezo driven 'Super Tweeters) to get the most efficient pair to replace. Gasketing material was added to all driver mounting flanges, prior to re-installation. We ‘added’ gasketing material the base and the lower cabinet, and between the woofer cab, and the 'mid-tweet' module, to further reduce any possibilities of vibration or acoustic anomalies. Felt feet were installed to the bottom plates. Cosmetically, the grills were cleaned & the cabinets 'real wood' Walnut veneer had a fresh coat of 'Feed-n-Wax' then buffed. The original 'Smoked Glass' top plates are chip, scratch and crack free. The cabs and grills (some fairly typical 'cat snags' to the black knit and a small, 'older repair ding' on the edge of the upper module - see above photos) are in great shape, especially for being around 33 years old. Next, as always they were tested with both recorded material, PN 20-20k and swept them with our AF generator from 1Hz-3kHz. Then came our standard, 'issue exposing' and on some levels, 'abusive' test recordings. These speakers are ready to go!
We auditioned this pair extensively and 'THEY....

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?


...Following the above mentioned 'barrage' of test signals, our demo cuts ran the gamut from Dire Straits' "So Far Away" from their album 'Brothers in Arms' album, Donald Fagens, "I.G.Y." from the album "Night Fly", '24K Gold Edition of Jennifer Waren's "Famous Blue Raincoat', TLC's "Scrub" from their album 'Fan Mail' (did 'sub-bass' note @ 1'25" & 1'35" VERY WELL), Allison Kraus and Union Station's "Baby, Now That I've Found You" (this especially opens up with a Carver 'Sonic Holigraphy' unit on this album), Trapt's 'Headstrong', Don Williams' DDD version of 'Country Boy', Calvin Hampton's, "The Wedding March" from "Digital Pipes, The Splendor of the Organ" (was BIG as expected it should be) a digital recording of a cathedral pipe organ, Sheffield Labs' "Escape Clause" was 'crisp, solid and punchy', Most of the cuts from Michael Jacksons' 'Number Ones' such as "Bad" "Beat It", and "Smooth Criminal", were 'KILLER', Van Halens' '1984' cuts 'ROCKED', but especially "Hot for Teacher", a recording of 'Saint Patricks Cathedral Choir' (was very 'realistic' to listen to), and a few others, all digitally recorded and some 'DDD'.
....power handling characteristics. They are able to ....
Not simply referring to they're wattage rating, but just the way they...
...We had a couple pair of HPM-1100's, and these have....
Too 'Little'...well you can't 'fix' that)....
These are in excellent condition as well.
... Efficient enough to make...

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?
  
  
Pioneer HPM-1500 Speakers Feature:
- 4-...
...ctors
  
PIONEER *HPM-1500 (HPM-150) SPECIFICATIONS:
  Frequency Response: __Hz ± 3dB
  Efficiency: 9__ dB 1w @ 1m (I would argue that is a....)
  Nominal Impedance: __Ω each
  Cross-over frequencies (*HPM-1500 ONLY): @ __, __k & __kHz
 RMS / Max power rating: __ / __ watts

HEY, WHY ALL THE 'X'd' OUT / OMITTED SPECS AND TEXT?
 
  Pioneer HPM-1500 / HPM-150 are from what most folks (including us) would argue was ....
....us the such great Pioneer units as the Spec 1, 2, 3 & 4 Pre-amps and amplifiers, The CT-F1250 Cassette deck, The monstrous SX-1250 & SX-1980 Stereo Receivers, and the classic RT-707 & RT-909 Reel to Reel decks. If you are looking for a beautiful pair of HPM-1500's, sonically as well as cosmetically, then here you go! We will include a pdf, 'e-copy' download for the Pioneer HPM-150 / HPM-1500 of the original spec sheet / service info.
Each measures .....  Includes our 30 day warranty (excluding problems due to under / over powering)
Vintage Pioneer HPM-1500 Stereo Speakers
Condition 8.5++
(C) M.R.
SOLD 5/17/13
SHIPPED TO CALIFORNIA


(Due to the dimensions and / or construction of these speakers, Packing / Shipping will be somewhat more 'involved' than typical and will be in 'multiple' boxes. While we order custom built boxes often, this can sometimes delay shipping by 5-10 days)

  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)