PART CAR : Early '70s AM/FM/FM-ST/8-Tracks had the power amplifiers mounted *above* the glove box (can't count the number I have seen at flea markets without the amplifier - usual answer when asked about the connector is "power antenna". (know is a bit late for the group but want to be complete). Reason was as mentioned before - not enough room under the dash. A. Padgett Peterson, P.E. Cybernetic Psychophysicist Totally Obsessed with TransOceanics My other car is a Pontiac too We also walk dogs PGP 2.7 Public Key AvailableI had a 1983 Oldsmobile with the cassette version of this radio. AM/FM/FMST/CB. It was two piece, well actually three piece. There was the radio itself, the CB unit, and the antenna splitter that allowed the radio antenna to be used for the CB.
PART CAR : Dr. Joe and I went out this morning to look at a 1973 convertibleparts car that he had located in the Raleigh-Durham-Chapel Hill areaof NC. (Better know as the Research Triangle Area). The VW ismissing the engine as the owner used it in another VW. Other than theengine, the car appeared to be close to complete. It has been settingfor some time and it has a lot of rust (heater channels, rear wheelwell, & more). The car would not be considered a restorablepurchase. The owner's husband said $200.00, but I think his wife mayhave to approve the price. If you are in the area, and are restoringa 1973 convertible, it could be well worth the money for a parts car.If you are interested, e-mail me for information on whom to contact.(do not post for contact information)
PART CAR : Archive-name: car-audio/part3Rec-audio-car-archive-nam e: FAQ/part3Version: 4.42Last-modified: 08 November 1998This section describes some elements necessary for understandingsubwoofers - how they operate, how to build proper enclosures, how topick the right driver for you, and how to have a computer do some ofthe work for you.4.1 What are "Thiele/Small parameters?" [CD, RDP]==================================== ================These are a group of parameters outlined by A. N. Thiele, and later R.H. Small, which can completely describe the electrical and mechanicalcharacteristics of a mid and low frequency driver operating in itspistonic region. These parameters are crucial for designing a qualitysubwoofer enclosure, be it for reference quality reproduction or forbooming.`Fs' Driver free air resonance, in Hz. This is the point at which driver impedance is maximum.`Fc' System resonance (usually for sealed box systems), in Hz`Vas' "Equivalent volume of compliance", this is a volume of air whose compliance is the same as a driver's acoustical compliance Cms (q.v.), in cubic meters
PART CAR : `Sd' Effective piston radiating area of driver in square meters`Vd' Maximum linear volume of displacement of the driver (product of Sd times Xmax), in cubic meters.`Rg' Amplifier source resistance (includes leads, crossover, etc.), in ohms`Qms' The driver's Q at resonance (Fs), due to mechanical losses; dimensionless`Qes' The driver's Q at resonance (Fs), due to electrical losses; dimensionless`Qts' The driver's Q at resonance (Fs), due to all losses; dimensionless`Qmc' The system's Q at resonance (Fc), due to mechanical losses; dimensionless`Qec' The system's Q at resonance (Fc), due to electrical losses; dimensionless`Qtc' The system's Q at resonance (Fc), due to all losses; dimensionless`Ql' The system's Q at Fb, due to leakage losses; dimensionless`Qa' The system's Q at Fb, due to absorption losses; dimensionless`Qp' The system's Q at Fb, due to port losses (turbulence, viscosity, etc.); dimensionless`n0' The reference efficiency of the system (eta sub 0) dimensionless, usually expressed as a percentage`Cms' The driver's mechanical compliance (reciprocal of stiffness), in m/N
PART CAR : `Mms' The driver's effective mechanical mass (including air load), in kg`Cmes' The electrical capacitive equivalent of Mms, in farads`Lces' The electrical inductive equivalent of Cms, in henries`Bl' Electro-magnetic force factor, can be expressed in Tesla-meters or, preferably, in meters/Newton4.2 How does speaker sensitivity affect real world SPL? Will a higher sensitivity give me a larger SPL? [MS] ======================================== ================================When it comes to mids and highs, efficiency (sensitivity) is a fairlygood indicator of output differences at the same power level. When itcomes to subwoofer performance, the driver's sensitivity is irrelevantunless you are also specifying a box volume.An efficient sub requires a larger box to achieve equivalent extensionto a less efficient sub. In a small box, the less efficient sub willactually be LOUDER at low frequencies at the SAME POWER as the moreefficient sub.Linear excursion is a very good indicator of ultimate output capability(given sufficient power to drive the speaker to that point.) To makesound you must move air; therefore, the more air you move, the moresound you make. When comparing two speakers of equal surface area, theone with greater excursion capability will play louder given sufficientpower.
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