EMI 13 x 8 were elliptical speakers unpopular in the USA since sound waves are round, not elliptical but compare to and last better than electrostatics with better bass yet cannot be repaired professionally. EMI and DECCA were record labels, EMI reel to reel tape recorders thought the 'Rolls Royce' of recording machines. Alan Blumlein, inventor of stereo sound, working with EMI, proposed the ultra-linear amplifier used in the Leak TL10 and popularized in the 1950s by Hafler and Keroes. EMI developed 'kinkless tetrode' KT66 and KT 88 audio tubes, supreme for audio.
Rusted chassis affects sound quality, glue and paper exposed to severe dampness. PVC surrounds obviously crumpled affect sound quality, ought to be perfect.
Your amplifier needs to be rebuilt or new before judging sound of EMI Hi-End speakers which as vintage, need run-in too with now prohibitively expensive eBay amplifiers and not with NAIM which suited more modern Redheko tube speakers. Equipment connected to Hi-End EMI must be of the correct tube type listed below. Lo-Fi EMI speakers for Lo-Fi tube amplifiers are in the 92390 link in this guide. Output tube specified affects the performance.
IMPEDANCE in Ohms: 3, 4, 5, 8, 15 and 16 available.
Upgrading: X-over is for the EMI tweeter working with the bass driver speech coil and not any random choice of replacement tweeter, modern tweeters lacking brown paper voice coil formers also make a tonal mismatch. Empty box cabinets improve by adding acoustic wadding, DLS529X has Glass Fiber (GF) yellow Loft insulation (claimed best bass absorber) about 2.5" thick on sides, back, top and base. White GF and recycled 'chopped clothing' are wadding for the GF/paper-mix cone 13 x 8. Car sound deadening brown wadding in B&W P2H. Modern methods of deadening cabinet vibrations are known to speaker builders. See books!
EMI 901 Below, Hand made 19 x 14" bass, Chrome plated magnet, later the EMI 950 both with 4 co-axial tweeters. F. R. 15Hz (for tuba) -20KHz, Power 50w, comprehensive off board x-over, mid-range and tweeter controls. 'Would be' answer to Altec 605 Duplex powered by Leak/EMI RS141, EMI 950 box 3.5-4 cubic ft.
19 x 14 ins. EMI 901, 950 for studios
EMI 901/ 3273 as above 'style', Bass, heavy duty, 19 x 14 ins., woofer only, tarnished brass magnet detail has 5 bolts, one center, silver presence cone look underside cone only, (EMI 901/ 5172 no alloy cone) raised dome in pepper pot dust cap like EMI 14 x 9 series, light color cone with brown circle around brown paper voice coil former, low power, high efficiency, gasket 'spaces' suggest co-axial tweeters may have been removed, black roll edge is coming away from the narrow side of the cone. Guide price, £350 a pair.
Cast basket versus stamped steel is a mass production issue, steel baskets need made in huge numbers to justify cost of the stamp, cast baskets made in small batches. Steel baskets may rust while cast baskets may break as vintage examples, both vibrate with sound. Castings heavier, less likely to go out of shape when screws tightened, affecting ideal cone travel.
Cast Basket EMI ellipticals: 13 x 8 Club/Disco 50 watt, 14 x 9 Hi-End Audiophile 25 watt, 16 x 11 Club/Disco, 19 x 14 901 Studio Monitor, EMI 3273 chassis.
BASKET COLOR suggests year of manufacture and no EMI labels appear on some magnets:-
First issue EMI '48800N' cube magnet gold electroplated basket. Silver or electroplate color basket 13 x 8, early 1960s. Bronze color '92390' series 13 x 8, mid to late 1960s. Green 92390 13 x 8 basket, early 1970s. Some AlNiCo cube magnets lack the red labels.
BENJAMIN ELECTRONIC SOUND CORP., Farmingdale, N.Y., EMI 205 14 x 9 chassis.
Emisonic EMI orthotone STD373, 25 watt ultra-linear EL 34 Push/Pull tube mono block amplifier as fitted in the active EMI DLS-1 speaker, 0.1% THD, 4, 8, 16 ohm taps, EF 86, ECC83, GZ34 rectifier, special output transformers, superior to Leak TL 25 plus.
EMI 205/770N8, green 14A/770NX, 105 & Emisonic STD373 amplifier
EMI 205: 14 x 9, 25 watt (50w USA) 14 x 9 elliptical EL34, KT77 tube, 770N8 driver, roll edge, alloy center portion, pepper pot tinplate domed dust cap, glass fiber reinforced cardboard cone also copes with bass reflex ported enclosures (instead of circular cone ribs) with Higher Flux magnet, x-over filter mounted on brown or green hammer tone paint finish chassis, green, true 20Hz 'Basso profundo' advert, highly rated by owners - sell at high start bids with no repeat of listing in not receiving any!
EMI 215, EL34, KT77, matched speaker set, green 14 x 9 bass unit 14A/770NX has distinctive dome in pepper pot dust cap, two 5 inch mid-range for wide dispersion and offset 3/3/8" tweeter to avoid power peak distortion, 8 ohms, Frequency Response 20Hz -20KHz, 30 watts, X-over with adjustable controls.
EMI Speaker Sale 14 x 9, 14A/770NX (no chassis filter of 770N8) chassis offered in EMI LEK215 kit were 'used up' as twin driver sub woofers, unpopular as low priced bargain speaker chassis, mercilessly revealing of flawed sound with 'low priced' amplifiers they're 'Bargain' Hi-End, tone colored to suit pricey tube gear not for cheap Solid State. 14A/770NXP has no magnet EMI label.
EMI 250 5" round bass driver, wide suspension 'roll edge' surround, 3/1/4" tweeter, 8w.r.m.s., Frequency Response 80Hz - 20KHz, x-over 6.5KHz, 8 ohms, box 11 x 8 x 6ins.
Left above EMI 315 chassis, Right and below EMI Benjamin Model 300
EMI 315 above, EL 34, KT 77 tube 15" 8 Kg each, 'true woofer' claimed 'built to superb specifications', brown paper voice coil former for low power natural tube audio tone, no on-board EMI 300 filter on + terminal chassis leg, rough pulp bass cone, cast chassis, 5 magnet bolts, one center, roll edge, 2 x 5" round squawkers, 2 x 3/3/8" tweeters, Frequency Response 20Hz - 20KHz, adjustable controls mid/high x-over, 35w.r.m.s. continuous, 70 watts American, 8 ohms, see LEK315 box size below for best sound quality. Suits Solid State reputed to simulate EL 34 tube sound, QUAD 405-1 etc.
Benjamin EMI Model 300, $350US a pair, 15 inch, smaller dust cap, more curved deeper cone than EMI 315, gold color basket, 25lb cast chassis, EMI on-board filter mounted beside + terminal on cast chassis leg, 4 magnet bolts, one center, 2 x 4 inch squawkers, 'probably' suited to bigger room harman/kardon Citation II with KT88 EMI Model 300 offering round sound waves. Cube style cabinet H.28ins. x W.25.5ins. x D.19ins., particle board - may be rebuilt in plywood!
EMI 99110 tweeter, 3/3/8 ins curved paper for baffle mount, 3, 8 or 15 ohms, Gap flux 10,000 gauss, Frequency response 3KHz - 20KHz, x-over 4.5KHz, voice coil dia.1/2 ins., copper wire.
EMI 319 92390BP, KT66 tube, (often mistaken for newer issue roll edge 350). (also 92390PE [rare] and 92390FC). Higher sensitivity than 20w EMI 750, similar sound stage, 13.5 x 8 1/4 ins co-axial combination speaker, Frequency Response 20Hz-20KHz from 3.5 inch paper cone/edge tweeter, later reduced to 3.12 inch dia. paper cone/edge. Bass Voice Coil 1 inch dia., copper wire on brown paper former, 1970s green basket have white stick on dot, 60s bronze basket have orange stick-on dot, ceramic magnet, 6 versions 3-15 ohms, 10-20 watts, 13 x 8 inch EMI bass/mid, alloy portion, light cardboard, cone with P.V.C. corrugated surround, orange cloth sleeve L/C coil x-over. Gap flux 13,000 gauss. Total flux 69,000 maxwells. X-over at 5KHz. LC orange sleeved filter is mounted on chassis. Near Field Monitor for QUAD II, Leak TL12.1, Heathkit W5M, 1940s Williamson amplifier and RCA KT66 mono block.
Rare EMI 319 - the green back 92390FC, QUAD 22/II, Heathkit W5M
EMI 31006 Twin hard PVC tweeter version of EMI 48800N, corrugated paper edge 40Hz-13KHz, 10w, alloy portion cone, interesting top basket x-over detail with small green electrolytic capacitor and speaker terminals on a silver painted cube magnet. Stamped steel dull electroplated gray basket lacks 'side bulges' of the later 92390 series 13 x 8 speaker.
EMI 350, EL 34, KT 77 tube combination speaker, PVC 'roll edge' version 13.5 x 8" bass with 3" co-axial tweeter on two bars, 20 watt model has large Long Throw magnet, unpainted with impedance 4, 8 or 15 ohm versions, 15 watt green painted, alloy portion cone, cork gasket, tinplate/fabric dust cap, x-over 5KHz. L.C. orange sleeved x.o. smaller than 319. Near Field Monitor for QUAD 303 amplifier. 10w green basket 350, (92390FT8) has 92390BN x-over coil and PVC edge 3.5" paper cone tweeter. Twin tweeter 15w 350 versions with 2.5" paper tweeters were seen. '73 year 92390KE has foam edge baffle tweeter or light gray tweeter on silver bars combination speaker, 15w chassis L x.o. not wound on capacitor.
EMI 97492 tweeter hard PVC cone 2/1/2 ins for baffle mount, Big AlNiCo 8,500 gauss, 3, 8 or 15 ohms, 5KHz-15KHz, x.over at 6KHz, voice coil dia. 1/2 ins., copper wire.
EMI 450, EZ 80/ EZ 81/ GZ30 tube, 13 x 8, blue cone 92390FP, 10 watt 'Lo-Fi', single co-axial tweeter version of EMI 150, no whizzer cone, lacks alloy portion cone of 1965 year 92390BN, same 10 watt x-over coil and magnet on its green hammer tone back. Twin 'Bozak style' tweeter version of EMI 450 is 92390FY found in reel to reel tape consoles well liked by owners despite 13KHz HF limit. Matched speaker set, F. R. 55Hz-13KHz, 5 versions 3-15 ohms, 10-20 watts.
EMI 48800N 1959 Marconi-EMI style stamped steel basket 13 x 8.
EMI 550 13 x 8 studio, 5 ohm, 20Hz - 20KHz, 92390CR alloy portion cone, paper corrugated edge, 10w RMS L. x.o on bronze basket, drilled hole ceramic magnet, small fabric dust cap, brown paper voice coil former, 2 curved cone baffle mount HF units with ring magnets or 319 tweeter in Grundig DES 3 extension speakers.
EMI 630 EL84, KT61 tube, Hi-Fi bronze color basket 10 x 6" combination speaker, co-axial 3.5" paper tweeter, orange sleeve LC x-over at 5KHz, 8 ohms, 30Hz-20KHz, 5w R.M.S, 10w American or Peak, large magnet, alloy portion bass cone, PVC memory suspension, narrow rear mount paper gasket. 15 ohm bronze basket EMI 10 x 6 ins. bass and baffle tweeter feature in DECCA SC100 ($83 US from 17 bids) amplified loudspeaker with 2 x EL 84 tubes, a 10 watt push pull amplifier must suit EMI 10 x 6 ins. Found in Benjamin Sound Corp EMI 621, Scope EMI-62 and 630 speaker enclosures.
EMI 630, Altec Duplex 605 speaker, Williamson and Leak TL10 amplifier
EMI 650 8w, green back version of EMI 630 for Solid State power supply tube sound or QUAD 303 etc.
EMI 93670 HS, Lo-Fi 10 x 6ins version of EMI 450, 8 ohm, co-axial hard PVC 'clear cone' 2.5 ins. 13KHz tweeter on 2 bars like a diamond, fixed centrally at 2 of its 4 screw holes, green basket bass with small magnet, remarkable wide twin pleat corrugated 'paper only' surround and cone in one piece with red metalized 150v, 2uF x-over. Rear mount broad paper gasket.
EMI 711A KT66 tube, (like EMI 750 but for 15w QUAD II power amplifier) 319 style, 92390AL 13.5 x 8 on 3-way baffle, EMI 93870CH 10 x 6" elliptical squawker, 2 large ceramic magnet tweeters, large xo/1.2/6K/8.x over, back of baffle narrow dispersion, sound prized like Tannoy, QUAD ESL57, Leak TL12.1 and Garrard 401. Also 92390BP with cabinet 29 x 15 x 15 ins., 13 x 8 20w model, 92390BC, 15 w.
EMI-812 EL 84, ECL 86 tube, Round 6-inch speaker, 99110 tweeter, x.o. inductor/cap, small DLS 529 box style, 8 ohm.
EMI-812, smallest of the Scope 'Dangerous Loudspeakers' suits EL 84 amplifiers
EMI 850 6/1/2" round bass driver 3/3/4" HF, x.o. inductor, Frequency Response 65Hz-20KHz, 8 ohm.
EMI 8ins round Loudspeaker, Type 14A/1000BA, circa 1972 year, Impedance 8 ohm, PVC surround, cloth dome dust cap, brown paper cone, black hammer tone stamped steel basket with gray plastic magnet cover and 99110 series hammer tone green basket paper cone tweeter marked BS.
EMI DLS 529: (DLS - DANGEROUS SPEAKER) 'back of baffle' mount, narrow dispersion assisted by metal mesh grille, 2-way speaker, 99110B tweeters, early 13 x 8 red cube magnet 92390G basket, some doped around alloy portion, bronze basket color, 4 ohm, later models with round ceramic magnet bronze basket 13 x 8, F.R. 38Hz-20KHz, x.o. 4.5KHz, sewn bag wadding.
EMI DLS 529X: Later version with 1" layer yellow G.F. wadding in place of Scope sewn pillow wadding.
EMI 9206 (in the UK) floor standing enclosure with brass metal grille and original EMI DLS 529 drivers.
EMI Scope Electronics advert showing the old 'Dangerous Loudspeakers' name
EMI Scope advert, 901 center with 901 co-axial driver bottom right, EMI 319 right of 901, EMI 630 right of EMI 319, EMI 711A left of EMI 901, EMI DLS529 left of the 711A and far right is the EMI-812.
EMI speakers of the 1960s came before Loudness switches on amplifiers, so the speakers boost up bass and treble making 'receivers and amplifiers sound better.' Sound is more colored but pleasant as many tube amplifiers lack bass. (KT 66 audio tube developed by Cabot Bull & Sidney Rodda at EMI international, the supreme audiophile tube as KT 88).
Look real close to see the alloy portion cone below, blocks in-cabinet coloration, creates 'presence'.
1964 year Japanese market 'Dr Dutton' EMI 92390 combination speaker
EMI-69 Japanese market speaker of 1964, special advanced construction Noriyuki cabinet, its DECCA/EMI 13 x 8, 92390PF goes down to 20Hz, 13,000 Gauss with white tweeter response to 30KHz, only sold in Japan within its cabinet, 16-ohm, 20 watt (USA), bare cork gasket.
EMI-45 Standard, Main BBC broadcast studio monitor in 1964, 92390PB combination speaker of bass 40Hz - 60Hz, 'world's best speaker system that adjusts sub chamber' in USA and Japan, 20W, 16 ohm, W. H. D., 400 x 800 x 300 MM, 11K Gauss, small ceramic magnet, 350 style chassis x.o., special advanced construction cabinet (built to EMI specification) gives 50Hz-20KHz.
EMI 750 20 watt (QUAD 303 'triples' power amplifier) 13/1/2 x 8/1/4 with 10 x 6 mid-range and two 3/3/8" tweeters, comprehensive x-over adjustable mid-range and tweeter controls. 92390GF 8 or 15 ohms, heavy long throw magnet, 15 watt version 92390KE has '319 style' magnet, see EMI 92390 Guide.
EMI Constructor Kit Series, flat pack teak veneer kits with EMI grille badges, box size guide.
LEK 150 EMI 150 box 17/1/2" x 10/1/2" x 7/1/4", LEK 215 for 14 x 9 box 31ins x 13ins x 13 ins, LEK 250 for 5ins bass driver, box 12/1/2 x 6/1/2 x 8/1/2 ins. LEK315 for 15ins round bass driver box, 37ins x 25 ins x 13 ins. LEK350 for 15w r.m.s. 350 13 x 8 (not 20w model) box, 23/1/2 x 12/1/2 x 11/1/2ins. 515 x 335 x 85 MM:- 319 or 20w 350, LEK450 for EMI 450 13 x 8, box, 17/1/2 x 10/1/2 x 11/1/2ins, LEK650 for 10/3/4ins x 6/1/2ins bass, single 3/1/4 HF tweeter, box, 35Hz lowest note in this box size, note B&W DM1 box is available but pricey, only 5 watts RMS. 17/1/2 ins x 10/1/2 ins x 7/1/4 ins, LEK850 for EMI 850, box, 12/1/2 x 8/1/2 x 7/1/2 ins, LEK 175/8 for EMI 8 x 5ins. full range driver, Elliptical wide P.V.C. corrugated edge 9 x 5 ins. bass with twin 97492 15Khz baffle mount tweeters, LEK 275/8 for EMI 8ins bass/mid driver, 3/1/4ins tweeter, LEK 575/8 for 13 x 8 bass and 8 x 5 squawker/tweeter.
1/2 ins plywood including baffle, for longer baffle 14 x 9 etc, suitable internal volumes are not made too great by sliding the base board up or down. Flakeboard is thicker, 3/4ins, same inside volume, 10% tolerance.
EMI ready built speakers:- LE.1 8 x 5 full range, LE.2 13 x 8 2-way single tweeter, LE.3ss 13 x 8 (double wound voice coils for use in surround systems) 2-way twin tweeter, LE.4 14 x 9 3-way, 8 x 5 squawker, 2 round tweeters, all 8 ohm.
GOLDIEDUCK ON 'THE PERILS OF PERFECTION'^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
A 1965 Scope Electronics advert claims the EMI DLS529, beats speakers like Goodmans, Altec and Tannoy - can they be serious? In 1965, E.M.I. speakers had QUAD II and Leak TL 12.1 tube amplifiers.
Scope Electronics 'Blame EMI Model DLS 529's astonishing sensitivity. The fantastic transient response of this speaker will mercilessly reveal flaws in any defective or outmoded equipment used with it.
Goldieduck - Transient Response in QUAD's Electrostatic ESL-57 speaker aims to eliminate 'overhang' or the human ability to tell you're listening to a loudspeaker and not a real source but it's only as good as the electrical sound fed into the speaker and EMI had their own record cutting levels.
Scope Electronics 'Or be grateful for the pure perfection of ability to reproduce what program material is fed into it. For this means music and voice with live 'presence'.
Goldieduck - remarkable EMI 319 reproduces any musical type with equal facility, music you're used to from other speaker sources suddenly sounds better but only in the sweet spot, true Hi-Fi speakers for people with properly set up stereo systems, hoping for a very special stereo experience.
Scope Electronics 'Credit the DLS-529 woofer's unique aluminum center cone with its highly compliant Poly-Vinyl Chloride (PVC) "memory suspension". The two high frequency units with critically curved diaphragms. The exclusive woven metal grille for clean sound dispersion.'
Goldieduck - "memory suspension?" The suspension ought to stop any ringing from a previous speaker cone in/out cycle, so it removes any 'memory' of the previous cone cycle, suspensions were either paper or cloth, some rubberized, the idea of using P.V.C. was novel. Metal grille makes sound spread out.
Scope Electronics 'results in a performance of wide range and smoothness with limpid sound that floats in the air and leaves no clue to the actual size or location of the loudspeakers, the whole room seems to play.'
Goldieduck - 'Wide range' was 20Hz - 20KHz when most didn't go that wide. 'Smoothness', more powerful sounding Frequency Response. 'No clue to actual size or location' EMI 319 has magnificent deep bass extension and scale from compact boxes at only 0.01 watts -when properly placed- toed inward to the sweet spot, a real 'surround sound' effect. '...floats in the air....' sharp wide sound stage when amplifiers are warmed up, without Loudness and tone controls flat. Dr Dutton, designer, inspired by 1951 year Tannoy 'Monitor Silver' Dual Concentric!
Scope Electronics 'Another Peril : Some audio dealers who don't have EMI loudspeakers may tell you other speakers have reached the same perfection in art. They haven't'.
Goldieduck - E.M.I. need run in for a while to get your ears used to them and get their cones and x-overs used to the new highs and lows of your audio. This 'running in' is a very gradual increase in power, starting where the volume control starts to work and over a weekend getting up to about 1 watt peak, you may need a power meter. It's difficult to find by comparing to others why 319 speaker sound makes you so interested, they seem to have a quality making them hard to stop listening to.
Scope Electronics "And certainly not at the EMI price comparison - listen : The case for the "dangerous" loudspeaker deserves a hearing."
Goldieduck - Goodmans were low priced Hi-End to create a 'Best Seller', in the 1990s speakers became as highly priced as electronics, explaining why today some old speaker chassis have crazy prices on eBay. EMI 319 is useful for 'low power' tube amplifiers, Leak TL12.1, most musical and expensive of all Leak power amplifiers; QUAD II has the EF86 tube, disliked by some, but manages 0.02% THD to the red EF37A tubed Leak 12 Point One's 0.1% THD.
EMI 'Club' 16 x 11 in a 1960s 'rear baffle mount' enclosure
E.M.I. 'Club' 16 x 11 and '901' 19 x 14 Co-axials:- improved doppler and intermodulation distortions were the aim of multiple wired tweeters seen above. Huge heavy magnets, screw down speaker wire terminals. Suit high power, high quality tube amplifiers used for electrostatic speakers.
'Long baffles' in the B&W P1 or D.M. 3 let EMI 13 x 8 speakers produce deeper notes, whilst in short baffles like the Hacker L.S.1000., bass notes below 50Hz are unlikely.
Black cork gasket says 'front of baffle mount' is intended, the bronze color basket twin tweeter 92390BN is later called the 450, radiogram console units, noted for good bass. Follows obsolete 1950s EMI 9 x 4" full range 3 ohm, 5 watt, outstanding powerful bass drum reproduced!
Other EMI speakers: EMI 630A with 8-inch round woofer by Benjamin Electronic USA, Dome tweeter 14A/1720A. Small round EMI midrange squawker with yellow cones partnered with a 14 x 9 roll edge. EMI 93870AP 10.5 x 6.5 ins, Full Range, alloy portion. Rare EMI 9 x 5 ins elliptical woofer with PVC edge and two baffle tweeters, interesting speaker set.