ELECTRO - TECH, INC.

Electro-Tech has developed a complete line of new replacement speakers engineered to fit in collector cars and function properly with OEM radios. Our speakers are manufactured in the USA using compact high energy neodymium magnets that allow these speakers to fit where others won't. Neodymium magnets (commonly referred to as super magnets) are 1/10 the physical size of round ceramic magnets found on most modern speakers but provide the same or higher field strength. Most of our speakers are true 8 ohm impedance and are fully compatible with 10 ohm Delco speakers. Many have whizzer cones for improved high frequency response and fabric surround for improved low frequency response. They work exceptionally well with original Delco, Ford and Mopar radios made from the 50's through the mid 70's and will make your classic radio sound better than new. Available in most popular sizes used with car radios from the late 1930’s through the mid 1970’s. Most of our speakers can handle the added power produced by our AM/FM conversion radios and modern car radios.   Our speakers carry a 5 year warranty against manufacturing defects.

Compare our replica 4 x 10 speakers to original Delco slim line speakers used in many 1960's GM products. The original "Delco Special Retangle"  is on the top left, our replacement speaker is on the top right. The bottom left speaker is our 4 x 10 Oval replacement. The 2 middle 4 x 10 oval speakers are original Delco 4 x 10 oval speakers. The lower right 4 x 10 is a common 4 ohm replacement speaker sold by many auto parts supply stores and restoration parts suppliers. The magnet on our speaker has more the twice the field strength of the ceramic magnet shown on the lower right speaker 4 times the strength of the original alnico magnets used on the original Delco speakers.

                        Original Delco 4x10 Special Rectangle                           Our 4x10 Replacement

             Our 4x10 Oval                           1964 - 67 Pontiac GTO                   1968-69 Corvette Kick Panel                 Generic 4 ohm speaker

Note: Many replacement speakers now sold by the discount stores, auto parts stores and mail order restoration parts houses are labeled as  "4 to 8 ohm compatible"  and are in fact 4 ohm speakers. These speakers can damage the older transistor radios. 4 ohm speakers will measure around 3.2 ohms with a DC ohmmeter. An 8 - 10 ohm speaker will measure around 7.4 ohms with a DC ohmmeter. The DC resistance is the critical number for the Delco radios as the output transistor is in series with the speaker. A properly operating Delco radio should have 1.5 volts DC across the speaker voice coil. A 4 ohm speaker will draw twice the current of an 8 ohm and cause the amplifier transistor (the half dollar size device mounted to the black finned heat sink) to run very hot. The speaker cone should be displaced in an upward (away from the magnet) direction about 1/8" when a Delco radio is turned on. If the cone moves down toward the magnet, the speaker leads need to be reversed.  Ford and Chrysler radios of the period used the same type of germanium output transistors as the Delco radios and also require 8 ohm speakers. However, Ford and Chrysler radios ran with 0 to 1 volt DC offset on the speaker depending on the radio model and vintage. Many will not deflect the cone when turned on like the Delco radios.

Warning: Never run 4 ohm speakers on any vintage car automobile radio using transistor output circuits.

If you don't know what type of output circuit your radio uses, call us.

Recone speakers: Many people call and ask if we can recone their original speaker. Sorry, but the answer is no. Many reconed speakers do not sound good or function right.  The old alnico magnets are becoming weak with age and most reconers do not have the equipment to remagnetize the magnet. Also, in many cases the frame and voice coil gap cannot be cleaned and reconditioned for the speaker to perform well. After years of having original speakers reconed with very mixed results, we decided to manufacture new speakers that would outperform the originals, fit in the original locations, and work with the original radios at a cost lower than recone.  

To order any of our speakers, just call us. We will be happy to help you in the selection of the proper speaker for your application. We accept VISA & MC for payment and ship same day US Prioity Mail.

In the US, you can call toll free @ (877)780-2861.   Outside the US, call 1-763-780-2861. We are open from 9:00 AM to 6:00 PM Monday thru Friday- Central Time.

Available Speaker sizes:

3 1/2"  Round - Used in late 60's and early 70's Cadillac, early 70's Olds, Pontiac, Buick and late 60's, early 70's Mopar front dash locations for stereo radio/tape applications. The mounting ears can be cut off and the speaker held in with the wire clips used on many GM applications(See photo below). We can supply a magnet filler block on request for cars using the Delco wire clip mount.

Note: When used with modern high power radios, this speaker should be connected with 100uf 50volt non-polar coupling capacitors in series to prevent overexcursion of the cone at very low frequencies. Some factory GM and all Mopar applications using these speakers have the crossover capactiors installed in a box under the dash. It is even more important when installed with our conversion radios or modern aftermarket radios with high power amplifiers. 

Price - $62.95 pair               8 - 10 Ohm         Size: 3 3/8" dia.   1 1/2" deep.  3 3/4" to 4 1/4" mounting center.

4 1/2" Pin cushion  - Used in Volkswagon, Porsche, some late 50's Lincoln applications.  Used in our dual 6 x 9 and dual 4 x 10 Delco Style speakers. See below for pictures of this driver. This is a excellent speaker for use in concealed locations due to its small size, light weight, and excellent power handling abilities.

Price - $28.95 each               Both  4  ohm and 8 ohm available           Size: 5" dia.  1 7/8" deep.  3 5/16" mounting centers.

5 1/4" Pin cushion - Used in late 60's and early 70's Ford, Mercury, Lincoln MK III's rear speaker stereo applications. Companion to our 4 x 8 speaker used in the doors of these cars. Also used in some 60's Porsche 356's.

Price - $38.95 each               8 - 10 Ohm       Size: 6" dia.  2 1/8" deep.  3 3/4" mounting centers.

6 " Pin cushion - Used extensively in GM applications mounted in the center of the rear seat cushion, starting with the  1958 Impala SS, Pontiac, Oldsmobile, etc. This speaker will greatly improve the rear seat sound of your original GM Radio, especially if used with the Stereo radios or reverb units. This speaker is also correct for 1960's VW bus applications.

Price - $38.95 each              8 - 10 Ohm       Size: 6 1/8"dia. 2" deep. 4 3/8" mounting centers.

8" Pin cushion - Used with tube style radios in the 40's box radios and 50's Olds, Pontiac, and early Corvette through 1957.

Price - $38.95                    4   Ohm         Size: 7  1/2" Dia,  2  7/16" Deep

4 x 6" Oval - Used in the dash and kick panels of many GM cars with the factory "Stereo" radios from the mid 60's through the mid 70's. This speaker will directly replace the rare 65, 66, 67, etc.,  Chevrolet kick panel speakers and rare Chevelle dash pad speakers with the twisted magnet.

Price - $62.95 pair            8 - 10 Ohm         Size: 4"W x 6 1/8"L.   1 1/2" deep. 3" x 5 1/4" mounting centers - many other combinations.

Price - $79.95 pair with Chevelle angle brackets installed.

Our 4 x 6 speakers are also available with angle brackets for direct bolt-in on 1970 - 72 Chevelle and Monte Carlo dash applications.

Original Delco 4x6 dash speakers for Chevelle shown on top. Notice the difference in the magnet locations for instrument panel clearance. If you look close, you will also notice the angle brackets are in different positions on teh driver side verses the passanger side speaker.

The middle picture is our 4x6 speakers bolted to the dash speaker support brackets. The bottom picture shows our 4x6 speakers with the angle brackets. Our speakers with the angle brackets installed for Chevelle sell for $79.95 a pair.

4 x 8" Oval - This is a very rare speaker size used in 1958 Cadillac, Studebakers, Lincoln Mark III's & IV's, Late 60's, early 70's   T-Birds in stereo radio applications. Now with improved cone and suspension.

Price - $36.95 each           8 - 10 Ohm           Size: 4"W x 8" L.  1 11/16" deep.  3 1/8" x 5 1/2" mounting centers.

4 x 10" Slimline Oval - Used extensively in many GM, Ford and Mopar products starting in 1959.  This is probably the most common car front dash  radio speaker size used in the 1960's by all manufacturers.   This speaker will fit in all 4 bolt oval 4x10 applications. Fabric cover on all 4 x 10 speakers.

Price - $38.95                 8 - 10 Ohm             Size: 4 1/8"W x 10"L.  1 1/2" deep.  3 1/4" x 6 7/8" mounting centers

                                                                                                                                   Shown with original Delco 68-69 Corvette speaker on top.                                                                                                                                         Note the Corvette hanger hook opposite the terminals.

4" x 10" Delco Style Special Retangle   - Newest   addition to our high quality line of  4 x 10 speakers. This speaker is an exact replacement for original Delco speakers used starting in 1965 Chevrolet and Chevelle amd in almost all GM cars by 1968 - 1972. This speaker is correct for 1968 - 1972 Chevy trucks as well. This speaker is very light weight and in will mount with the all original Delco/GM mounting brackets. The magnet cover block on the back of the speaker can be configured in either direction to match your original application and is user attached with an EDPM double backed tape ring.  Full installation instructions included. Fabric cover on all 4 x 10 speakers.

  Price - $49.95               10 Ohm           Size:   10 1/2"L x 4 3/4"W.   2 1/8" deep. No mounting centers - held in by bracket.

Some of the GM speaker brackets used to install the above speaker. These brackets are different on almost every model and year GM car and are NOT included with the speaker. You must have the original bracket to mount our 4 x 10 Special Retangle speaker.

5 x 7" Oval - Used in many Ford and Chrysler products as a rear deck speaker and in some cases, in the dash.

Price - $38.95               8 - 10 Ohm           Size: 5" W x 7 1/4"L.   2 1/8" deep.  4 3/8" mounting centers - both directions.

6 x 9" Oval - This is the most popular size car speaker. Used by all car manufacturers starting in the late 40's and still in use today. A common dash and rear deck speaker for many cars. Available in both 4 ohm and 8 ohm impedance. (Note: 4 ohm does not have the dual cone for 1955, 1956 Chevrolet full size factory radio applications). This speaker will fit in the 1946, 47, 48 Fords with factory radios.  (Fabric Dust screen available at no extra charge.)

Price - $38.95               4 & 8 Ohm available.      Size: 9 1/16"L x 6  5/16"W.   2 11/16" deep.  4 5/8" x 6 5/8" mounting centers.

6 x 9" Oval with correct Delco Load Coil - Used in 57, 58 full size Chevrolet front speaker applications  and Corvettes from 1958 through 1967.

Warning: There are many copies of this speaker available from other sources that have the wrong value load coil. Many we have seen have a DC resistance as low as .25 ohms. Load coils with this low resistance will appear to be a short circuit to the radio and destroy the output transistor. 

Price - $46.95        8 - 10 Ohm with 1.2 Ohm load coil.    Size: 9 1/16"L x 6  5/16"W.    2 11/16" deep.  4 5/8" x 6 5/8" mounting centers.

SX69 Coaxial 6 x 9" Oval - Our customers kept asking for a high end coaxial 6 x 9 speaker for use with our AM/FM conversion radios. This 6 x 9 utilizes a special metal/fiber composite woofer cone, rubber surround, and a high energy tweeter with built in crossover. Unlike our other speakers, this speaker uses a 20 oz ceramic magnet and is only suitable for rear package tray mounting. It will fit in the 1968-1972 GM A body convertibles behind the rear seat in the factory locations. This speaker is of 4 ohm impedance and cannot be used with original factory radios. A speaker of similar quality would cost twice this amount from the national electronics retailers.

Price - $89.95 pair including grilles.           4 Ohm                    Size:   9 1/4"W x 6 3/8"L.   3 1/2" deep.  4 5/8" x 6 5/8" mounting centers.

Included grilles

6" x 9" Stereo High Output - While similar to our standard 6 x 9" stereo speaker, this dual speaker uses drivers with a response curve more tailored to open cars providing improved clarity in windy or noisy enviroments. It utilizes 4 ohm voice coils and is only suitable for use with our AM/FM Stereo conversion or modern radios. This speaker is very compact and light weight - about 1 pound. Compare to others using smaller drivers at over 2 1 /2 times the weight. Fabric dust screen avaiable upon request at no additional cost.

Price - $69.95               4 Ohm                    Size:   9 1/4"W x 6 3/8"L.   2" deep.  4 5/8" x 6 5/8" mounting centers.

4" x 10" Delco Style Stereo High Output - This speaker uses the same High-Q drivers used in our 6 x 9 HQ dual stereo speaker, but mounted on an ABS plate with a foam rubber gasket to match the mid 60's through early 70's Delco 4 x 10. This speaker will mount back in the car with the original bracket in most cases. It is very light, weighing just over 1 pound. Compare to others using smaller drivers at over 2 1 /2 times the weight. This dual speaker uses drivers with a response curve tailored to open cars providing improved clarity in windy or noisy enviroments. Available with 4 ohm voice coils suitable for use with our conversion or modern radios or with 8 ohm voice coils for those who wish to install original factory stereo radios in Chevrolet cars but do not wish to cut their kick panels for the original 4 x 6 speakers.  Full fabric dust screen available upon request at no extra cost.

Price - $69.95        Both 4 ohm and 8 ohm available Size:   10 1/2"L x 4  3/4"W.    2 1/8" deep. No mounting centers - held in by bracket.

Our Dual 4x10 Special Rectangle speaker shown with Chevy bracket above right and Oldsmobile 442 bracket below.

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Last modified: March 14, 2008